G28-T01 - POWER-ONE - Datasheet.Live

BCD20023 Rev AB, 02-Nov-2010 Page 1 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table of Contents Page Page

Features

168

6.6"

141

5.6"

28 TE

111

4.4"

3 U

• Universal AC input range 70 to 255 VAC with PFC

• Class I equipment

• DC output for 24 and 48 V loads

• Battery charging for 24 and 48 V batteries with remote

temperature control

• 4 kVAC I/O electric strength test voltage

• Telecom rectifier applications

• V ery high efficiency, typically 93%

• Power factor >0.96, harmonics according to IEC/EN

61000-3-2, low RFI

• No inrush current, hot swap capability

• High power density, rugged mechanical design, all

boards covered with a protective lacquer

• Very compact 19" cassette (28 TE, 3 U, 160 mm)

Safety according to IEC/EN 60950-1 and UL/CSA

60950-1 2nd Ed.

Description

The T Series converters are electrically isolated AC-DC

converters with an output power of up to 550 W. For higher

power requirements several converters may be connected in

parallel.

The input is ideally adapted to the mains: Full power factor

correction, no inrush current, low RFI level, and high transient

and surge immunity are key design features. A T Series

converter behaves similar to a resistive load.

The LT models can be operated from a universal AC-input

range from 85 to 255 VAC. It is the preferred type for 230 V AC

mains, whereas the UT models are optimized for 110/

120 VAC mains. The output delivers an electrically isolated

Safety Extra Low Voltage (SELV) and is short-circuit and no-

load proof. Depending on the type, two output characteristics

are available, intended either for rectifier applications or for

battery charging purposes.

The latter types can be integrated into systems, where the

output voltage is backed-up by a battery. The float charge of the

battery can be set by a cell-voltage selector switch according to

the battery type used. These converters are equipped with a

temperature sensor input, in order to improve the life

expectancy of the battery.

The rectifier models are suited for DC-bus applications at

constant voltage. As the output voltage is SELV, even

electrically non-isolated switching regulators, such as the PSx

models, may be connected to the output.

The LT/UT1701 models are especially optimized to build

distributed power systems together with the 48Q, CQ, or CP

Series DC-DC converters, as the signalling capabilities of

both families are matched. Distributed power systems have

as one advantage less power losses over load lines and fewer

regulation problems.

Power-One also offers backplanes for fast and simple set-up

of 19" DIN-rack systems with T Series converters; see

Accessories.

Description ......................................................................... 1

Model Selection .................................................................. 2

Functional Description ....................................................... 3

Electrical Input Data ........................................................... 4

Electrical Output Data......................................................... 6

Control Features of the Battery Chargers ........................ 11

Auxiliary Functions............................................................ 13

Different Configurations and Applications ....................... 18

Electromagnetic Compatibility (EMC) .............................. 21

Environmental Conditions ............................................... 22

Mechanical Data............................................................... 24

Safety and Installation Instructions .................................. 25

Description of Options ..................................................... 28

Accessories...................................................................... 29

BCD20023 Rev AB, 02-Nov-2010 Page 2 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Part Number Description

L T 1 7 40 -7 D F Z B1

Operating input range Vi , fi

70 – 140 VAC, 47 – 63 Hz.......................... U

85 – 255 VAC, 47 – 63 Hz........................... L

Series............................................................................... T

Number of outputs ........................................................... 1

Output setting voltage Vo set

24, 27.25 V .................................................. 2

48, 54.5 V .................................................... 7

40.9 V .......................................................... 8

Recifier version.................................... 01, 02 3

Battery charger version ............................. 40 4

Other voltages .................................. 00 to 99

Ambient temperature range TA

–25 to 71 °C................................................ -7

Customer specific............................. - 0 to -6

Auxiliary functions and options 1

Undervoltage monitor (option).................... D

Input fuse externally accessible ..................F

Cell voltage selector switch ......................... Z 2

Baseplate (option) .....................................B1

See Description of Options

2Only for T1240/1740/1840

3No input for battery temperature sensor

4With input for battery temperature sensor

Example: LT1740-7Z: AC-DC converter, input voltage range 85 – 255 VAC, single output 50.5 – 56.5 V, 10 A,

operational ambient temperature –25 to 71 °C, with cell voltage selector switch.

Model Selection

Table 1: All models. For all models and options, contact Power-One for availibility and lead times !

Output voltage Output current Operating input voltage range and efficiency Options

Vo set at Vi nom, 0.5 Io nom Io nom Vi min – Vi max ηη

ηη

ηmin 1 Vi min – Vi max ηη

ηη

ηmin 1

[VDC] [A ] 70 – 140 VAC [%] 85 – 255 VAC [% ]

24.25 16 UT1201-7 2, 4 91 LT1201-7 2, 6 90.5 D

25.25 – (27.25) – 28.25 14.5 UT1240-7Z 4, 3 91 LT1240-7Z 6, 3 91 F

37.9 – (40.88) – 42.4 11 – – LT1840-7Z 6, 3 91 B1

48 11 – – LT1702-7 2, 6 92.5

54.5 10 UT1701-7 5 92 LT1701-7 6 92.5

50.5 – (54.5) – 56.5 10 UT1740-7Z 5, 3 92 LT1740-7Z 6, 3 92

1Min. efficiency measured at Vi nom and Io nom; typ. values are approx. 1% better.

2Instead of output power limitation, output current limitation.

3Output voltage range controlled by input Vcr, remote temperature sensor, and cell voltage selector switch.

4Reduced output power for Vi = 70 – 95 VAC; see Output Power Limitation.

5Reduced output power for Vi = 70 – 100 VAC; see Output Power Limitation.

6Reduced output power for Vi = 85 – 155 VAC; see Output Power Limitation.

Product Marking

Basic type designation, applicable safety approval and

recognition marks, CE mark, warnings, pin designation,

Power-One company logo.

Specific type designation, input voltage range, nominal output

voltage and current, degree of protection, batch no., serial no.,

and data code including production site, version, and date of

production.

BCD20023 Rev AB, 02-Nov-2010 Page 3 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Functional Description

The T Series AC-DC converters are primary controlled with a

constant switching frequency of 65.5 kHz. The power factor

corrected single step conversion of the line input voltage to a

low output voltage results in extremely high efficiency.

The input voltage is fed via input fuse, filter, and rectifier to the

main transformer. The wideband input filter with small input

capacitance generates virtually no inrush current. Transient

suppressors protect the converter against overvoltage and

surges. An auxiliary converter generates an internal supply

voltage for the primary control logic. The input voltage

waveform is sensed by the primary control logic to provide

active power factor correction.

The main transformer is connected to a rectifier, large output

capacitors, and an efficient output filter, which ensures low

output ripple and spikes, and provides the necessary hold-up

time. The output volt age is fed back to the primary control logic

via a signal transformer.

The inhibit signal and the T failure signal are transferred by a

second signal transformer (no opto-couplers are used !).

System Good and Output OK are each indicated by a green

LED; inhibit and T System Failure by a red LED.

System Good and Power Down are available as open collector

signals at the connector. The threshold level of the Power

Down signal can be externally adjusted at the D set input.

Test sockets at the front panel allow for the measurement of

the output voltage.

The battery charger version provides additional features to

control the output voltage. To set it to different battery float-

charge voltages, a 16-step selector switch (Z) is standard.

A control input to control the output voltage by an external

temperature sensor is available at a control pin. A trim-

potentiometer allows fine adjustment of the output voltage.

Output filter

Isolation 4 kVAC

Vo+

HC+

HC –

Vo–

Sys In

Sys Ou

i/Vcr

D set

Vo–

Input filter

Control

logic

Voltage

and

system

monitor

Auxiliary

converter

NTC

Fuse

03043a –

Fig. 1

Block diagram

BCD20023 Rev AB, 02-Nov-2010 Page 4 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Electrical Input Data

General condition: TA = 20 °C

Table 2a: Input data of LT models

Input LT12xx LT17xx LT18xx Unit

Characteristic Conditions min typ max min typ max min typ max

ViOperating input voltage range 47 – 63 Hz 2155 255 155 255 130 255 VAC

with full output power

Vi red Operating input voltage range 85 15 5 85 155 85 13 0

with reduced output power 1

Vi (Vi nom) Rated (nominal) input voltage 50 – 60 Hz 2100 (230) 240 100 (230) 240 100 (230) 240

Ii nom Nominal input current Vi nom, Po nom 1.9 2.6 2.2 A

Ii L Input current limit 3 4 4

Pi 0 No-load input power Vi min – Vi max, Io = 0 6 8 8 W

Pi inh Input power when inhibited Vi min – Vi max, inhibit = low 3 3 3

PF Power factor Vi nom, Io nom 96 98 98 %

CiInput capacitance 3 444µF

ton Switch on delay Vi nom, Po nom 400 400 400 ms

Conducted emissions Vi nom, Vo nom, Io nom BAB

Radiated emissions EN 55022 BBB

Vi p Input overvoltage protection 4 264 264 264 VAC

Vi L Input undervoltage lockout 65 65 65

Table 2b: Input data of UT models

Input UT12xx UT17xx Unit

Characteristic Conditions min typ max min typ max

ViOperating input voltage range 47 – 63 Hz 295 140 95 140 VAC

with full output power

Vi red Operating input voltage range 70 95 70 100

with reduced output power 1

Vi (Vi nom) Rated (nominal) input voltage 50 – 60 Hz 2100 (110) 125 100 (110) 125

Ii nom Nominal input current Vi nom, Po nom 3.8 5.2 A

Ii L Input current limit 3 4

Pi 0 No-load input power Vi min – Vi max, Io = 0 6 8 W

Pi inh Input power when inhibited Vi min – Vi max, inhibit = low 3 3

PF Power factor Vi nom, Io nom 98 98 %

CiInput capacitance 3 44µF

ton Switch on delay Vi nom, Po nom 400 400 ms

Conducted emissions Vi nom, Vo nom, Io nom BB

Radiated emissions EN 55022 BB

Vi p Input overvoltage protection 4 165 165 VAC

Vi L Input undervoltage lockout 65 65

1See Output Power Limitation

2Contact Power-One for operation with other input frequencies or different waveforms !

3Inrush current stays factor 10 below ETS 300132-1.

4In the case of an overvoltage, the converter switches temporarily off, resulting in reduced output power.

BCD20023 Rev AB, 02-Nov-2010 Page 5 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

0246810121416

0.82

0.84

0.86

0.88

0.90

0.92

0.94

0.96

0.98

1.00

[A]

UT1740-7Z at V

= 110 VAC

LT1740-7Z at V

= 230 VAC

04023a

Table 3: Fuse Type

Series Schurter type Part number

LT SPF 6.3 A, 250 V 0001.1012

UT SPT 10 A, 250 V 0001.2514

Input Fuse

An input fuse (5 × 20 mm) in series with the input line (L)

inside the converter protects against severe defect s; see also

Safety and Installation Instructions. For applications with

accessible fuse, see Option F.

Fig. 3

Harmonic distortion at input LT1740-7Z, Vi = Vinom, Io = Io nom

Fig. 4

Harmonic distortion at input UT1740-7Z, Vi = Vinom, Io = Io nom

Inrush Current

The converters exhibit an input capacitance of only 4 µF,

resulting in a low and short peak current, when the converter

is connected to the mains. During switch-on, the converter

current can rise up to the input current limit Ii L.

As a direct result of the low and short inrush current and

controlled charging procedure of the output capacitors, the

converter can be hot swapped. The LT inrush current is a

factor 10 smaller than defined in the ETS 300132-1 standard

for Telecom systems. However the converter should be

plugged-in smoothly, giving time to the output capacitors to be

charged.

Input Under-/Overvoltage Lockout

If the specified input voltage range Vi is exceeded, the

converter stops operation temporarily resulting in reduced

output power and increased RFI. The input is protected by

varistors. Continuous overvoltage will destroy the converter.

If the sinusoidal input voltage stays below the input under-

voltage lockout threshold Vi, the converter will be inhibited.

Power Factor, Harmonics

Power factor correction PFC is achieved by controlling the

input current waveform synchronously with the input voltage.

Fig. 2

Power factor Fig. 5

Efficiency versus load of LT1701

357 9 11 13 17 Harm.15

3.0

2.5

2.0

1.5

1.0

0.5

mA/W

3.5

04026a

Limit class D according

to IEC/EN 61000-3-2

357 9 11 13 17 Harm.15

3.0

2.5

2.0

1.5

1.0

0.5

mA/W

3.5

04025a

Limit class D according

to IEC/EN 61000-3-2

0246810121416

0.82

0.84

0.86

0.88

0.90

0.92

0.94

0.96

[A]

= 110 VAC U

= 230 VAC

04024a

BCD20023 Rev AB, 02-Nov-2010 Page 6 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

PFC is active in all operating conditions (voltage regulation,

output power limitation, current limitation).

The power factor control also works with different input volt age

waveforms and frequencies. For special applications with

different frequencies or non-sinusoidal waveforms, please

contact Power-One.

Efficiency

The extremely high efficiency (see fig. 5) is achieved by using

a single-step power factor corrected topology together with the

most advanced technology in power conversion. It allows a

very compact design in a fully enclosed case without forced

cooling.

Electrical Output Data

General conditions:

•TA = 20 °C, unless specified.

•Vi = 230 VAC, fi = 50 Hz

Table 4: Output data of rectifier versions

Output LT/UT1201 LT/UT1701 LT1702 Unit

Characteristic Conditions min typ m ax mi n typ ma x min typ m ax

Vo set Output voltage adjustment Vi nom 24.25 54.5 48.0 V

Vo set tol Vo setting tolerance Io = 0.5 • Io nom 24.0 24.5 54.25 54.75 47.75 48.25

VoOutput voltage over input voltage and load 1Vi min – Vi max , 23.35 24.95 52.8 55.8 46.3 49.3

(0.01 – 1) • Io nom

Vo L Overvoltage protection by second control loop 32.5 59.3 59.3

αVo Temperature coefficient of output voltage –5 –5 –5 mV/K

Io nom Nominal output current 16 10 11 A

Io L Current limit 2 Vo = 20 V 18 4 14.5 14.5

Po L Output power limit 2 Vi nom 400 550 550 W

voOutput voltage noise Low frequency Io nom 850 1000 1000 mVpp

Switching freq. IEC/EN 61204 40 40 40

Total BW = 20 MHz 900 1000 1100

∆Vo I Static load regulation (droop) 1(0.01 – 1) • Io nom –0.6 –1.2 –1.2 V

∆Vo V Static line regulation Vi min – Vi max, 0.3 0.8 0.8

Io nom

Vo d Dynamic load regulation 3Voltage deviation Vi nom 1.7 2.2 2.2

t d Recovery time 0.1• Io nom ↔ Io nom 0.25 0.25 0.25 s

IEC/EN 61204 5

CoInternal output capacitance 86 41 41 mF

1Output voltage decreases with rising output current due to the droop characterstic to ease current sharing; see fig. 7.

2Due to the large output capacitance, the maximum transient value can be much higher.

3Deviation limited by output overvoltage protection

4No power limitation, but current limitation

5See fig. Dynamic load regulation.

BCD20023 Rev AB, 02-Nov-2010 Page 7 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

General conditions:

•TA = 20 °C, unless specified.

•Vi = 230 VAC, fi = 50 Hz

Table 5: Output data of battery charger versions

Output LT/UT1240-7Z LT/UT1740-7Z LT1840-7Z Unit

Characteristic Conditions min typ m ax m i n typ m ax min typ ma x

Vo set Output voltage adjustment 6Vi nom 27.25 54.5 40.88 V

Vo set tol Vo setting tolerance 4Io = 0.5 • Io nom 27.2 27.3 54.45 54.55 40.83 40.93

VoOutput voltage range

1 25.25 28.25 50.5 56.5 37.9 42.4

VoOutput voltage over input LT Vi min – Vi max , 26.8 27.6 53.8 55 40.3 41.3

voltage and load 1 UT (0.01 – 1) • Io nom 26.9 27.6 53.8 56.6

Vo L Overvoltage protection by second control loop 32.5 59.3 48.4

αVo Temperature coefficient of output voltage –3 –3 –3 mV/K

Io nom Nominal output current 14.5 10 11 A

Io L Current limit 2 20 14.5 16

Po L Output power limit 2 Vi nom 400 550 450 W

voOutput voltage noise Low frequency Io nom 700 1000 850 mVpp

Switching freq. IEC/EN 61204 40 40 40

Total BW = 20 MHz 750 1000 900

∆Vo I Static load regulation (droop) 1(0.01 – 1) • Io nom –0.4 –0.6 –0.6 V

∆Vo V Static line regulation 1Vi min – Vi max, 0.2 0.35 0.25

Io nom

Vo d Dynamic load regulation 3Voltage deviation Vi nom 1.6 2.0 2.5

t d Recovery time 0.1• Io nom ↔ Io nom 0.2 0.2 0.2 s

IEC/EN 61204 5

CoInternal output capacitance 86 41 49 mF

1Vo decreases with rising output current due to the droop characterstic to ease current sharing; see fig. 8.

2Due to the large output capacitance, the maximum transient value can be much higher.

3Deviation limited by output overvoltage protection

4Defined by temperature sensor, by remote control, and by voltage selector switch

5See fig. Dynamic load regulation.

6Output voltage adjustment with Vcr = 9.5 V (2.27 V/cell)

Output Characteristic

The models T1701/1702 and the battery chargers T1240/

1740/1840 can be operated in 3 different modes:

– Output voltage regulation

– Output power limitation

– Output current limitation.

Caution: In output power or current limitation mode, the max.

ambient temperature TA should not exceed 65 °C with free air

convection cooling.

The output of all models is fully protected against continuous

short circuit. The maximum constant current is limited to Io L

(see table Electrical output data). As the LEDs indicating the

system status are driven from the output voltage, all LEDs

switch off in the case of a short circuit.

Fig. 6

Output characteristics LT1701-7 and LT1740-7Z

0246810121416

0Io [A]

Vo [V]

output

voltage

regulation

output

power

limitation

output

current

limitation

05045b

Vi = 110 V

Vi = 230 V

Vi = 100 V

Vi = 90 V

BCD20023 Rev AB, 02-Nov-2010 Page 8 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Output Overvoltage Protection

A slight output voltage overshoot may occur at turn-on, inhibit

release, or during fast load changes. A second, independent

control loop interrupts the operation above Vo L and indicate it

by the red warning LED. The output voltage remains below

60 V (SELV) under all operating conditions.

Note: There is no specific built-in protection against externally

applied overvoltages or transients.

Output Voltage Regulation (Rectifier Version)

The output voltage is adjusted to a fixed value Vo set . It relates

to the output current and the input voltage, which ensures

current sharing without further precautions, when several

converters are connected in parallel. Rising output current and

falling input voltage lead to a decrease of the output voltage,

according to the formula:

Vo ≈ Vo set tol + (0.5 – Io/Io nom) • ∆Vo l + (∆Vi – ∆Vi nom)/100 V • ∆Vo V

Output Power Limitation (Rectifier Version)

Especially for power systems with an output voltage of 48 V,

the rectifier models T1701/1702 exhibit an output power

limitation mode. The output power is kept constant down to an

output voltage of approximately 38 V. This provides improved

start-up capability of power systems including switched-mode

power supplies connected to the output (e.g. 48Q Series). At

maximum load there is no need for a special start-up

procedure.

The maximum input current is limited to Ii L. At lower input

voltage Vi red the maximum output power is limited to:

Po ≈ η • Vi red • Ii L (η = efficiency approx. 90%)

T1201 models have no output power limitation mode.

Pulse Loading (Rectifier Version)

To prevent the output and filter capacitors from overload, the

superimposed AC ripple current at the output should be limited

as shown in the figure below. For high-current pulse loads,

external capacitors are recommended.

∆V

o I

10% ∆V

o d

o nom

0.9

0.1

∆V

o d

05051a

Fig. 9

Typ. dynamic characteristics (at load step)

[V]

04027a

10 11 14.5 16 A

54.4

T1201 T1701/1702

Fig. 7

Output characteristic of T1201 and T1701/1702 (typ.). The

droop is shown in fig. 8.

Fig. 8

Typical output droop (LT 1701)

–1%

–2%

0.01 0.5 1 I

o nom

o set

∆V

05081a

100

1 k 10 k

o PL

[A]

[Hz]

= 50° C

= T

C max

= V

i nom

Average output current = I

o nom

Sinusoidal ripple current

05050a

Fig. 10

Maximum AC ripple output current superimposed on the

average output current Io nom for LT1701.

BCD20023 Rev AB, 02-Nov-2010 Page 9 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Output Voltage Regulation (Battery Charger)

In normal operating mode (neither in power limitation nor in

current limitation) the output is regulated by a volt age feedback

loop. It is adjusted to Vo set and can be set by the cell voltage

selector switch to the appropriate float charge voltage of the

battery.

A control input (pin 28) allows for adjustment of the output

voltage either by a voltage source, a temperature sensor, or an

external potential divider (see External Output Voltage

Control). For fine tuning, the converter is fitted with a trim

potentiometer accessible from the rear side.

The output voltage relates to the output current and the input

1.1%

0.55%

–

0.9%

0.01 0.5 1 I

o nom

∆V

05046a

o set

Fig. 12

Typical output droop T1240/1740/1840

voltage, which ensures current sharing without further

precautions, when several converters are connected in

parallel. An increase in output current and a decrease in input

voltage decrease the output voltage, according to the formula:

Vo ≈ Vo set tol + (0.5 – Io/Io nom) • ∆Vo l + (∆Vi – ∆Vi nom)/100 V • ∆Vo V

The dynamic characteristic is shown in fig. 9.

Output Power Limitation (Battery Charger)

All battery charger versions exhibit an output power limitation

mode, where the output power is kept constant from 2.35 V/cell

(for lead acid batteries) to 1.6 V/cell.

The maximum input current is limited to Ii L. At lower input

voltage Vi red, the maximum output power is limited to:

Po ≈ η • Vi red • Ii L (η = ef ficiency approx. 90%).

Inhibit (Rectifier Version)

The rectifier version converters are equipped with a simple

inhibit function (with no adjustment of Vo). The converter is

enabled by a logic high signal and disabled by a logic low

signal. This input is TTL/CMOS compatible, a resistor <50 Ω

disables the converter, a resistor >30 kΩ enables it. The

switch-on time tr, i.e., the time delay between powering until

the full output power is available, is typically 100 ms.

The hold-up time at the output after inhibiting depends on the

load, the internal and external capacitance at the output.

Note: The inhibit input is protected against overvolt age up to 60 V.

Fig. 11a

Output characteristic of T1240 (typ.). The droop is shown in

fig. 12.

Fig. 11b

Output characteristic of T1740 (typ.). The droop is shown in

fig. 12.

40.88 V

06067a

11 A 16 A

42.4 V

37.9 V

28.5 V

54.5 V

06066a

10 A 14.5 A

56.5 V

50.5 V

38 V

26.7 V

06065a

15 A 20 A

28.25 V

25.25 V

19 V

Fig. 11c

Output characteristic of LT1840 (typ.). The droop is shown in

fig. 12.

Table 6: Characteristics of the inhibit signal

Characteristics Conditions min typ max Unit

Vinh Inhibit Vo = on Vi min – Vi max 2.5 60 V

voltage TC min – TC max

Rinh Resistance Vo = on 30 kΩ

to Vo–

Vinh Inhibit Vo = off –0.7 0.4 V

voltage

Rinh Resistance Vo = off 50 Ω

trSwitch-on time Vi nom 100 ms

until full power avail.

Pinh Input power with 3 W

inhibited unit

BCD20023 Rev AB, 02-Nov-2010 Page 10 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

N~ Vo–

i/Vcr

Vo+

Iinh

Vinh

06116a

226

Converter

Fig. 13

Inhibit connection

Table 7: Hold-up time thold for T1701

Vo = 54 V Vo min v Unit

Po [W] 46 V 43 V 40 V 38 V

100 164 219 270 302 ms

200 82 109 135 151

300 55 73 90 101

400 41 55 67 75

500 33 44 54 60

550 30 40 49 55

Hold-Up Time

The hold-up time depends upon the output voltage at the time

of failure, the minimum acceptable output volt age, and the load

according to the formula:

Vo2 – Vo2 min v

thold = –––––––––––– • (Co + Cext)

2 • Po

where:

Vo= Output voltage at the moment of mains’ failure

Vo min v = Minimum acceptable output voltage

Po= Average output power during hold-up time

Co= Internal output capacitance

Cext = External output capacitance

Examples of t hold are given in the table below:

Fig. 14

Hold-up and warning time with Power Down output signal.

Note: The table Hold-up time also informs about the warning time

of the Power Down signal. For example, if the threshold level Vt of

the Power Down signal is set to 43 V and the minimum acceptable

voltage of the load is 38 V, the time between the activation of the

power-down signal and the switch-off of the load (550 W) will be

15 ms (= 55 ms – 40 ms).

Series and Parallel Connection

The output of the T Series converters may either be connected

in series or in parallel.

Connection in parallel: Current sharing between paralleled

converters is ensured by the output droop (slope)

characteristic.

Note: Several Txx40 battery chargers connected in parallel can be

controlled by a single voltage source or a single sensor wired to

the inputs i/Vcr.

Connection in series: A maximum of two T Series converters

may be connected in series, however the resulting output

voltage of up to 110 V would no longer be SELV.

o min v

mains' failure

warning time

hold

low load

heavy load

05049a

BCD20023 Rev AB, 02-Nov-2010 Page 11 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Control Features of the Battery Chargers

According to the recommendations of battery manufacturers,

the float-charge voltage of lead-acid batteries should be

temperature-compensated. Depending on the battery type and

size, charging with different temperature coefficients may be

required. An excessive float-charge voltage may damage the

battery through overcharging.

Most lead-acid battery manufacturers recommend cell

voltages between 2.23 V and 2.32 V, with the nominal cell

voltage defined at 20 °C and temperature coefficients per cell

between –3 and –4 mV/K.

The value of the negative temperature coefficient is specified

by the type of T temperature sensor.

With the cell voltage selector switch Z, the required cell voltage

can be adjusted at the rear of the converter , making the system

flexible to different float-charge voltages. If the selector switch

Z is not applicable, a cell voltage adjustment can also be

provided by the temperature sensor; see Temperature Sensor

T).

Although it is not recommended, the output voltage can be set

to a fixed value without temperature compensation by an

external voltage source or a resistive voltage divider at the

remote control input, for instance if the battery temperature

shall be controlled by other systems; see External Output

Voltage Control.

Cell Voltage Selector Switch Z

The battery chargers are equipped with the cell voltage

selector switch at the rear side, which provides an easy way of

external adjustment to the required float-charge voltage. Each

switch position allows a step in the output voltage of 10 mV per

cell, whereby the switch position "0" represents a cell voltage

of 2.23 V at 20 °C; position "C" gives 2.35 V per cell.

The cell voltage selector switch fits together with the 2.23 V

temperature sensor. The float-charge voltage is set by the

switch, and the temperature coefficient is specified by the

sensor type.

Caution: Setting the switch to the correct battery cell voltage is

vital for the proper operation of a battery system.

Note: Switching to a different cell voltage while the battery charger

is operating may cause a short distortion of the output voltage.

Potentiometer for Fine Tuning

The battery chargers are equipped with a one-turn

potentiometer for fine tuning of the output voltage to within

±3.70/00 of Vo. The potentiometer is protected by a plastic

cover. To adjust the output voltage for improved current

sharing or compensation for voltage drops over the load lines,

each battery charger in a system should be unplugged and

adjusted individually to the same output voltage at equal load;

otherwise current sharing may adversely be affected.

External Output Voltage Control

The i/Vcr control input (pin 28) provides two functions:

– External adjustment of the output voltage

– Inhibiting of the converter.

A voltage <0.4 V inhibits the output, a voltage >2.5 V enables it.

With the i/Vcr input in the range of 5.5 V to 11.5 V, the output

voltage Vo set can be adjusted within a range of +3.6% to

–7.9%. This feature is optimized to control the float-charge of a

lead acid batteriy.

Outside of the control range, the sensor monitoring circuit

generates a system error signal (see also System Good).

In the case of a excessively high control voltage, the output

voltage is reduced.

The remote control input is protected against DC overvoltage

up to 60 V.

Note: An open inhibit/Vcr remote control input leads to a sensor

error signal which is indicated by the Error LED at the front and

high impedance of the "System good" signal. The output voltage is

reduced to Vcr fail condition.

2.23 V 2.24 V

2.25 V

2.26 V

2.27

2.28 V

2.29 V

2.30 V

2.31 V

2.32 V

2.35 V

06068

Fig. 15

Cell voltage selector switch

Table 8: Characteristics of the remote control

Characteristics Conditions LT/UT1240 LT1840 LT/UT1740 Unit

typ typ

VoOutput voltage at: Voltage selector switch 25.25 37.85 50.5 V

Vcr fail 2.5 – 5.5 V Z set at 2.23 V/cell or

Vcr control 5.5 – 11.5 V without selector switch Z 22.5 + Vcr • 0.5 22.5 + Vcr • 0.5 45 + Vcr

Vcr clamp 11.5 – 14 V selector switch Z 28.25 42.37 56.5

Vcr fail 14 – 60 V Vi nom, 0.5 • Io nom 25.25 37.85 50.5

Rcr Input impedance 1 1 1 M Ω

fcr Frequency limit 1 1 1 Hz

BCD20023 Rev AB, 02-Nov-2010 Page 12 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table 9: Characteristics of the inhibit signal

Characteristics Conditions min typ max Unit

Vinh Inhibit voltage Vo = on Vi min – Vi max, 2.5 60 V

Rinh Resistance to Vo- Vo = on TC min–TC max 30 k Ω

Vinh Inhibit voltage Vo = off – 0.7 0.4 V

Rinh Resistance to Vo- VUo = off 50 Ω

trSwitch on time until full power available Vi nom 100 ms

Pinh Input power at inhibited converter Vi nom 3W

Fig. 16

Output voltage Vo versus control voltage Vcr, with the

corresponding signal System Good

50.5

56.5

[V]

345 5.5 11.5 14 16 VV

Logic level of

the signal

System Good

37.85

42.37

25.25

28.25

06069a

T1240 T1840 T1740

5.3 V 14 V

If the voltage selector switch Z is not set at 2.23 V per cell, the Vcr

fail voltage rises accordingly.

The inhibit input of battery charger models is not TTL/CMOS

compatible and should be triggered by a switch, a relay, or an

open-collector transistor.

Control by external resistors

With a resistive potential divider or a potentiometer connected

to the remote control input, a fixed output voltage can be

programmed:

Vcr = Vo – 45 V (T1740)

Vcr = 4/3 • Vo – 33.7 V (T1840)

Vcr = 2 • Vo – 45 V (T1240)

Vo • R2

Vcr = ––––––––

(R1 + R2)

R2: Value with 1 MW internal resistance in parallel with R.

It is mandatory that:

(R1 • R2)

––-–-–--–– > 35 kΩ

(R1 + R2)

otherwise the converter might not be able to start.

Control by an external voltage source

Fig. 18

Voltage setting by an external voltage source

Fig. 17

Voltage setting by external resistors

Control by the temperature sensor T

The temperature sensor provides a temperature-compensated

charging process for lead-acid batteries; see Accessories,

Temperature Sensor T.

Ext. voltage

source

5.5 – 11.5 V

–

Vo–

i/Vcr V

05062a

Vo+

i/Vcr

Vo–

1 MΩR

Vo–

Vo+

R2 = 1 MΩ • R/(1 MΩ + R)

Vcr

05063a

BCD20023 Rev AB, 02-Nov-2010 Page 13 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Fig. 20

Standard version; the power down circuitry monitors directly

Vo via Rint. Rext is not necessary.

Auxiliary Functions

Available Signals and Status Monitoring

The T Series exhibits an inhibit function as well as several

voltage monitoring and indicating functions for easy control

and surveillance of a complete customer-specific power supply

system. All the surveillance functions are driven from the

output. Consequently, it also operates, when the input voltage

is off, down to an output voltage of 5 V. The power consumption

of the surveillance circuit is typically 10 to 20 mA.

Available functions:

– Power Down D pin 30

D set pin 32

– System Good Sys In pin 24

Sys Out pin 26

– Inhibit/Vcr remote control i/Vcr pin 28

The status is indicated by 3 LEDs on the front panel:

– System (OK) green

–Vo(OK) green

– Error red

Test sockets at the front panel allow easy measurement of Vo.

Power Down Function

The power down circuitry monitors Vo and changes the status

of output D (pin 30) from low to high impedance, when Vo falls

below the low threshold level, and changes back to low

impedance, when Vo exceeds the upper threshold level.

The rectifier versions have a relatively small hysteresis of 1 V,

the battery charger versions have a large hysteresis. The

upper threshold level is given, but the low threshold level is

externally adjustable at the D set pin 32. The Power Down

signal D (pin 30) can for example be used as a save data

signal, for low voltage warning, as a low-battery signal to avoid

deep discharge of the battery, or to prevent connected

converters from starting-up at a low bus voltage. For

application examples, see figures below using the signal D.

As it is driven from the output, the power pown circuitry

operates independently of the input voltage and the load

conditions, even if the converter is inhibited.

The standard version monitors Vo internally; see fig. below.

Vo+

–

D set

T1000-7D

Rext

External

adjustment of th

threshold level V

43.2 kΩ

(21.5 kΩ)

–+

06051a

Fig. 21

Option D (D-set internally not connected); the power down

circuitry monitors the power bus decoupled by the fuse F.

With option D, the output voltage can be sensed externally, for

example, to monitor the system bus decoupled from the power

supplies by diodes or fuses. An external resistor of 43.2 kΩ 1%

(21.5 kΩ for T1840) must be fitted into the sense line to the

bus; see fig. below.

Adjustment of the threshold level

With the resistor (Rext) connected to D set (pin 32) and Vo– (or

Vo+), the low threshold level can be increased (or decreased)

respectively; see fig. 20 and 21.

If the D set input is left open-circuit, the low threshold level of

the power down circuitry is factory-set to:

T12xx: Vt set = 21 V ±0.2 V

T17xx: Vt set = 42.5 V ±0.5 V

VT18xx: Vt set = 32 V ±0.4 V

The approximate resistor values for given threshold levels can

be calculated from the table below:

The threshold level is adjusted for a DC output voltage. If in

operation a sinusoidal low frequency output ripple is

superimposed to the DC output voltage, it can be estimated

with Vov = Io/(2 • π • f • Co), where Co is the internal output

capacitance.

Table 11: Typ. values for Rext for a given Vt value for LT1740

Characteristics Conditions VtUnit

VtPower down threshold 69 kΩ to Vo+ 34.4 V

level, 106 kΩ to Vo+ 36.4

set by Rext 254 kΩ to Vo+ 39.5

left open-circuit 42.5

309 kΩ to Vo– 45.5

154 kΩ to Vo– 48.5

102 kΩ to Vo– 51.6

Vo+

Vo–

D set

ext

int

–+

06050a

43.2 kΩ

(21.5 kΩ)

External adjustment o

the threshold level Vt

Table 10: Calculation of Rext

Model Vt >>

> Vt set Vt <<

< Vt set

(Rext connected to Vo–) (Rext connected to Vo+)

T12xx 463.5 43.2 Vt – 463.5

Rext (Vt) = –––––––– [kΩ]Rext (Vt) = ––––––––––––– [kΩ]

Vt –21.0 21.0 – Vt

T17xx 933 43.2 Vt – 933

Rext (Vt) = –––––––– [kΩ]Rext (Vt) = ––––––––––––– [kΩ]

Vt – 42.5 42.5 – Vt

T18xx 461 21.4Vt – 461

Rext (Vt) = –––––––– [kΩ]Rext (Vt) = ––––––––––––– [kΩ]

Vt – 32 32 – Vt

BCD20023 Rev AB, 02-Nov-2010 Page 14 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table 12: Characteristics of power down functions

Characteristics Conditions min typ max Unit

IDOutput TC min – TC max 50 1 mA

sink current

Vsat Saturation voltage ID = 50 mA 0.2 V

VzZener voltage 62

PzZ-diode PLoss TC = 95 °C 500 mW

1 To be limited to 50 mA by the external circuitry.

Fig. 23

Power down function (D output)

– External adjustment of threshold level Vt

– Signal electrically isolated by an external relay

Fig. 24

Remote indication of signal D by LED

Fig. 25

Remote indication of the output voltage status (output D) by

CMOS/TTL interface (e.g., for data saving)

Upper threshold level

The upper threshold level of the power down function is given.

The rectifier models have a relatively small hysteresis of 1 V to

prevent the signal from oscillation.

The battery chargers have a larger hysteresis. The upper level

is set at 2.05 V/cell.

To avoid deep discharge of the battery, the load should be

disconnected from the battery at the low level of the power

down signal. The battery voltage will then recover slowly up to

its chemical equilibrium, about 2 V/cell. The load may not be

connected again to the battery, until the T converter is

operating and charging it. Then the output voltage will be

higher than 2.05 V/cell.

High level of output signal D (pin 30):

LT/UT1240: 24.6 V ±0.3 V

LT/UT1840: 49.2 V ±0.5 V

LT/UT1740: 43.9 V ±0.4 V

Fig. 22

Hysteresis of D output signal for battery chargers with

corresponding level of Power Down signal

Bat

float

Battery

recovery

Battery

low

Mains failure Return of mains

Hysteresis

Power Down

Load switch ON

Load switch OFF

high

low

Power down signal

2.05 V/cell

2.0 V/cell

06052a

Signal output characteristics

Output D (pin 30) is an open-collector signal, referenced to

Vo–, protected by a 62 V Zener diode; it is well suited to drive

an external relay.

Under normal operating conditions (Vo > Vt), output D has low

impedance. If the output voltage drops below the power down

threshold level, output D becomes high impedance.

Vo+

Vo–

D setRext

06053

red LED

Vo+

Vo– LED is "ON"

in case of

power down

06054

Vo+

Vo–

+5 V

CMOS, TTL

06055

Fig. 26

Output D signal used as inhibit to enable a system start-up in

the case of subsequently connected step-down converters

PSK/ PSS/PSx with low start-up voltage. (For 48Q/CQ units,

no pull-up resistor is required.)

Vo+

Vo–

LT/UT

Vi+

Gi–

PSK/PSS/PSx

10 kΩ

0.5 W

06056a

BCD20023 Rev AB, 02-Nov-2010 Page 15 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table 13: Characteristics of System Good input and output

Characteristics Conditions min typ max Unit

ITrig Trigger level for logic current-driven Vi min – Vi max 100 µA

VTrig low input (= System OK) voltage-driven TC min – TC max – 0.4 6.2 V

ITrig Trigger level for logic current-driven 0 A

VTrig high input (= System Failure) voltage-driven >7.5 60 V

Isys Output sink current 1 50 mA

Vsat Saturation voltage ISys Out = 50 mA 0.2 V

VZZener voltage protection diode 62

PZPower disipation Zener diode TC = 95 °C 500 mW

1To be limited to 50 mA by the external circuitry.

Fig. 28

System status signal electrically isolated by an external relay

System Good Function

The Sys Out signal (pin 26) provides information about the

general function of the converter. It can be used to monitor the

status of a single T Series converter , or can be linked with other

signals within a power system to drive one single-logic signal

for the status of the whole system by connecting the output Sys

Out of one converter to the input Sys In (pin 24) of the next one.

Low voltage (impedance) of the input and output has the

meaning of "system good". The first input of the system has to

be connected to Vo–.

The signal Sys Out is activated (low impedance), if the

following conditions are met:

No external fault

– the Sys In signal (pin 24) is logic low,

AND:

No faults monitored by the T Series converter, such as:

– Input overvoltage

– Input undervoltage (mains failure)

– Output overvoltage

– Output short circuit

– Internal overtemperature

– Internal circuit fault.

– i/Vcr input error such as voltage < 2.5 V (rectifier type);

control voltage out of range 5.3 V > Vcr > 14 V (battery

charger), or sensor not connected, open remote control

input.

Signal input

The input Sys In (pin 24) can be voltage- or current- driven. To

trigger the internal comparator, the voltage at the Sys In pin

has to be <6.2 V, if voltage-driven. If current-driven, the sink

current to Vo– has to be >100 µA. An easy way to drive this

input is achieved by means of an open collector transistor, or a

10 V CMOS interface.

Note:If only the internal status of a T Series converter should be

monitored, Sys In has to be connected to Vo–.

Vo+

Sys Out

Vo–

No external free-

wheeling diode acros

relay necessary

06060

Signal output

The signal Sys Out (pin 26) has the meaning of “system good”.

It is built by an open collector transistor referenced to Vo–,

protected by a 62 V Zener diode.

Fig. 27

Equivalent circuit of Sys In and Sys Out

Sys Ou

Sys In

Logic high if no internal

error and no inhibit

Sys In

Logic high if

Sys In

> 100 mA

Sys Out

Vo+

Ref. Logic AND

06057

BCD20023 Rev AB, 02-Nov-2010 Page 16 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Series and Parallel Connection of Power Down and

System Good

To achieve a logic-OR function of the signals Sys Out and D,

connect the D output to Sys In. The desired function is then

obtained from the Sys Out output. The output signal becomes

high, if the output voltage is lower than the threshold of the

power down circuit, inhibit is applied, or an internal error has

occurred.

Fig. 29

Sys out and D connected in series. The output signal will

indicate an error at start-up.

Fig. 30

Wired AND of isolated open collector signals (e.g. the OUT OK signal of 48/CQ units) with the Sys Out

signals of T units in series to achieve one signal about the status of the whole system

To achieve a logic AND function of the Sys Out and D, connect

the D output with the Sys Out. This combination generates an

output signal only in the case of severe system errors. Only a T

system fault together with a simultaneous power down of the

output voltage will cause this output signal to become high

impedance.

Fig. 31

Sys out and D connected in parallel.

Vo+

Sys Out

Vo–

Sys In

Vo–

Vo+

Sys Out

Vo–

Overall

System

Good

Out OK

circuit

1 kΩ

20 V

Out OK

circuit

1 kΩ

20 V

Out OK

circuit

1 kΩ

20 V

06059a

48Q/CQ

no. 1

48Q/CQ

no. 2

48Q/CQ

no. x

Sys In

LT/UT LT/UT

24 24

22 22

26 26

22 22

Internal

signals

Vo–

Sys In

Sys Out

Vo+

i/Vcr

D set

Vo+

06061a

LT/UT

Internal

signals

Vo–

Sys In

Sys Out

Vo+

i/Vcr

D set

Vo+

06062a

LT/UT

BCD20023 Rev AB, 02-Nov-2010 Page 17 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table 14: System monitoring.

Signal status and LED display status depending on the situation of the various system elements

Possible Situation Open collector output LED

System Good Power Down Sys OK Vo OK Error

All OK low low on on off

No mains and battery OK or no mains and Vo > Vt2high low off on on

Unit inhibited and battery OK or unit inhibited and Vo > Vt2

Internal error 2

Sys In input 3high low off on off

No mains and battery low or no mains and Vo < Vt2high high off off on 1

Short circuit on LT/UT output, Vo < 4 V high high off off off

Current limit LT/UT output, Vo > 4 V, Vo < Vt 2 low high on off on

Battery chargers: sensor not connected or out of range high low off on on

1LED is on until the output capacitors are discharged.

2Sys In connected to Vo–.

3Sys In not connected to Vo– (single T status monitoring) or system status monitoring.

Display Status of LEDs

LED Sys OK

A green LED corresponds to the signal System Good. It lights,

if no internal or external error is detected.

LED Vo OK

Another green LED indicates the output voltage status,

corresponding to the signal Power Down. The LED lights, as

long as Vo exceeds the upper threshold level and has not

fallen below the low threshold level Vt.

LED Error

This red LED lights, if one or more of the following conditions

are detected:

– Input overvoltage

– Input undervoltage (mains failure)

– Output overvoltage

– Output short circuit

– Output voltage below threshold Vt

– Internal overtemperature

– Internal circuit fault

– i/Vcr remote control input error, such as:

- Inhibit voltage <2.5 V (rectifier models)

- Remote control voltage Vcr out of range 5.3 – 14 V

(battery chargers)

- Sensor not connected, open remote control input.

BCD20023 Rev AB, 02-Nov-2010 Page 18 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Different Configurations and Applications

Power Boosting, Redundant Configuration,

Hot Swap

For redundant configurations the outputs should be decoupled

by ORing diodes, protecting the DC-bus in case of an internal

short circuit at the output of one converter.

Decoupling can also be done using appropriate fuses in the

output path of each converter. If the battery voltage has to be

monitored, choose option D.

–

Converter Converter

Vo–

Vo+

Vo–

Vo+

06077a

–

Vo–

Vo+

Vo–

Vo+

LT/UTxx40 LT/UTxx40

HC–

HC+

HC–

Fuse Fuse

–

D set

R 43k2 R 43k2

D set

(21k5) (21k5)

06079a

Fig. 32

Redundant configuration without battery back-up

Fig. 33

T xx40 with battery back-up. Power Down signal monitoring

the battery voltage.

battery-buffered bus. Should however the converter already be

connected, when the battery is switched to the bus, the resulting

charge current will not be limited. To avoid having the fuse blow or

a possible arc across the circuit breaker, the battery charger

ORing diodes provide reverse polarity protection with no

reverse current in case of hot plug-in, but have the

disadvantage of some forward voltage drop.

For battery applications, decoupling with fuses is recom-

mended, since the voltage drop over the diodes would

decrease the battery voltage. In case of an internal short circuit

of a converter, the battery will deliver a very large current

causing the respective fuse to blow. The fuse should be

mounted in the positive power path of the converter, since the

monitoring signals are referenced to the negative path. The

fuse type should be suitable for DC application having a

current rating of 20 A or more with high breaking capability,

e.g., Littlefuse, series 314.

To enable hot plug-in in systems decoupled with fuses, the T

Series converters are fitted with an NTC resistor, limiting the

reverse current flowing into the discharged output capacitors

(see Functional Description).

For this purpose HC+ (pin 16) and HC – (pin 18) have to be

connected to Vo+ and Vo– respectively; see fig. 33. Since pins

16 and 18 are leading pins, the output capacitors are

precharged through the internal NTC resistor, before any other

pin makes contact. This protects the connector and prevents

the DC bus voltage from dropping during hot plug-in. Hot swap

should be done gently. Subsequent hot-swap actions should

be avoided. After disconnecting an operating converter, it

should be cooled down prior to reconnecting to the bus to

avoid damage of the fuse or the converter.

Note: The internal NTC limits the reverse charge current flowing

into the output capacitors, when the converter is plugged into a

should be powered by the mains prior to connecting the battery.

With ORing diodes, no reverse charge current flows from the

power bus into the output capacitors.

Battery Size and Ripple Current

Some consideration should be given to the battery size.

According to VDE 0510 part 2, the low frequency ripple current

of the floating charge current should not exceed 5 A per 100 Ah

capacity (0.05 C). The power factor corrected single step

conversion of the line input voltage to the low DC output

voltage generates a ripple voltage at the output of twice the

input frequency, causing a ripple current into the connected

battery.

T1701/1702

= 56 V

T1701/1702

= 56 V

T1740-7D

range:

50.5 – 56 V Battery

–

Load

06081b

Fig. 34

Configuration for a larger system with only a small battery

BCD20023 Rev AB, 02-Nov-2010 Page 19 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

For systems, where only a small battery back-up time is

required, battery charging by one T unit may be sufficient; see

also fig. below.

Caution: Lead-acid batteries can generate certain amounts of H2

and O2 gas, which can form explosive gas mixtures. Sufficient

ventilation must be provided in battery cabinets and installation

rooms.

Note: Local regulations must be observed. Further information

about designing battery systems is contained in VDE 0510, part 2.

Combination with DC-DC Converters

The T Series converters are designed to be operated with

DC-DC converter loads. Particularily suitable are 48Q

models, as they start working at approx. 38 V, thus avoiding

high currents at ramp-up. But also other series may be used,

for instance our CQ or P Series.

In a complete power system consisting of several T converters

connected in parallel combined with 48Q/CQ units, it may be

desirable to have one common signal indicating the status of

the whole system.

The DC-DC converters provide a galvanically isolated signal

Out OK. To obtain a logic AND, all Out OK signals should be

connected in series; see fig. below:

If in a system with 2 redundant T Series converters Power

Down is desired as one common signal, simply connect the D

pins of the two T converters. Then, Power Down only becomes

active, if both T converters fail, which would result in the bus

voltage failing (see fig. below).

–

Out OK–

Out OK+

–

48Q/CQ

–

Out OK–

Out OK+

–

48Q/CQ

–

Out OK–

Out OK+

–

48Q/CQ

NVo+

Vo–

T1700

Vo+

Vo–

Sys Out

Sys In

T1700

Sys In DOverall

System

Good

Power

Down

–

06082a

Fig. 35

Overall System Good and Power Down signal in a redundant

system

Fig. 36

Disconnecting the loads at low battery voltage in case of

mains’ failure

Fig. 37

Storing the System Good signal

Low-Battery Discharge Protection

Since all monitoring functions are powered by the output of the

T converter or the battery, in the case of a mains’ failure, Power

Down can be used to monitor the status of the battery and to

disconnect the load or part of it via the inhibit of the connected

DC/DC converters, when the battery voltage drops below the

threshold level of Power Down. This prevents further

discharge of the battery.

–

Out OK–

Out OK+

–

48Q/CQ

–

Out OK–

Out OK+

–

48Q/CQ

–

Out OK–

Out OK+

–

48Q/CQ

Sys Out

Sys In

LT/UT1740-7DZ

+–

Vo+

Vo–

D set

Fuse

43.2 kΩ

Rext +

HC+

HC–

–

06083a

Temp. sensor T

i/Vcr

Storing the System Good Signal

For battery back-up systems located in inaccessible areas it

could be of interest to know, whether there has been a Power

Fail (interruption of the mains). To obtain this information, Sys

Out should be connected to Sys In with a reset button

connected to Vo–. In this way a system failure like an

interruption of the mains will be stored at Sys Out until, the

reset button is pressed.

–

48Q/CQ

Sys Out

Sys In

LT/UT1740-7DZ

+–

Vo+

Vo–

Fuse

Stored

Sys Out

Reset

–

HC–

HC+

06084a

Temp. sensor T

i/Vcr

BCD20023 Rev AB, 02-Nov-2010 Page 20 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

T1740-7DZ

48Q/CQ

48Q/CQ 48Q/CQ

48Q/CQ

T1740-7DZ

System

controller

48 V

power bus (SELV)

(50.5 to 56.5 V)

Back-up

battery

48 V

12 V, 16 A

(8 A*) 24 V, 8 A

(4 A*)

+5.1 V, 64 A (48 A*)

power down

DC bus good

output good

N L

–

* For redundancy,

decoupling at the 48Q/CQ-

outputs with diodes is required.

Fuse

06085a

Temp. sensor

Fig. 38

UPS uninteruptable

power supply system

Fig. 39

Front end with various loads (example)

48Q/CQ

1001

48Q/CQ

2320 PSB

245

T1701

System

controller

48 V

power bus (SELV)

(53 to 56 V)

Cooling fan

±12 V, 4 A +24 V, 5 A

+5.1 V, 32 A

power down

DC bus good

output good

PCB heating

Lamps

Vo+

Vo–

48Q/CQ

1001

06086a

BCD20023 Rev AB, 02-Nov-2010 Page 21 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

0.05

0.1

0.5

[dBµV]

0.02

07035a

Electromagnetic Immunity

Table 15: Immunity type tests

Phenomenon Standard Level Coupling Value Waveform Source Test In Perf.

mode 1 applied imped. procedure oper. crit. 2

Electrostatic IEC/EN 4 contact discharge 8000 Vp1/50 ns 330 Ω10 positive and y e s A

discharge 61000-4-2 air discharge 15000 Vp10 negative

(to case) discharges

Electromagnetic IEC/EN 3 antenna 10 V/m AM 80% n.a. 26 – 1000 MHz yes A

field 61000-4-3 1 kH z

Electrical fast IEC/EN 4 capacitive, o/c 2000 Vpbursts of 5/50 ns 50 Ω60 s positive y e s A

transient/burst 61000-4-4 4 direct, ±4000 Vp2.5/5 kHz over 60 s negative

±i /c, +i/–i 15 ms; burst transient per

period: 300 ms coupling mode

Surge IEC/EN 3 ±i/c ±2000 Vp1.2/50 µs 12 Ω5 pos. and 5 neg. ye s B

61000-4-5 +i/–i 2 Ωsurges per coupling

mode

Conducted IEC/EN 3 i, o, signal wires 10 VAC AM 80% 150 Ω0.15 – 80 MHz yes A

disturbances 61000-4-6 (140 dBµV) 1 kHz

1i = input, o = output, c = case.

2A = Normal performance, B = Temporary loss of function or degradation of performance, not requiring an operator.

Electromagnetic Emission

The radiated noise in the frequency range of 30 MHz to

300 MHz on the input- and the output-side stays below class A

according to EN 55011/22 measured with an antenna.

The radiated noise of the T converters between 30 MHz and

1 GHz is reduced, if the converter is built into a conductive

Fig. 40

Conducted emissions (quasi-peak, typ.) at the input

according EN 55011/22, measured at Vi nom and Io nom.

Fig. 41

Typ. radiated emissions (quasi peak) according to EN

55011/22, normalized to 10 m, measured on an open area

test site at Vi nom and Io nom.

chromatized 19" rack, fitted with a front panel. For converters

mounted otherwise, e.g., wall-mounted with option B1 (base

plate), the radiated noise may be above level A.

protection against input transient voltages, which typically

occur in most installations, but especially in battery-driven

mobile applications. The T Series has been successfully

tested to the following specifications:

Electromagnetic Compatibility (EMC)

A suppressor diode or a metal oxide VDR (depending on type)

together with an input fuse and an input filter form an effective

100

300

[dBµV/m]

[MHz]

07039a

BCD20023 Rev AB, 02-Nov-2010 Page 22 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table 18: Reliability

Values at specified Model Ground benign Ground fixed Ground mobile Unit

case temperature 40 °C 40 °C 70°C 50°C

MTBF 1 LT1701-7 198 000 56 000 26 000 20 000 h

Device hours 2 810 000

1Calculated in accordance with MIL-HDBK-217E (calculation accord. to edition F would show even better results)

2Statistical values, based on an average of 4300 working hours per year and in general field use, over 3 years

Table 17 Temperature specifications

–7 Unit

Characteristic Conditions min typ max

TAAmbient operational Io = 0 – Io nom –25 71 °C

temperature range Io > Io nom –25 65

TCCase temperature range Io = 0 – Io nom –25 95

at measurement point; Io > Io nom –25 90

see Mechanical Data

TSStorage temperature –40 100

range (not operating)

TCs Case temperature, 100

when shut down

Rth CA Thermal resistance convection 0.5 K/W

case to ambient cooling

tCThermal time constant 1 h

of case

Environment al Conditions

Table 16: Mechanical and climatic stress

Test method Standard Test conditions Status

Cab Damp heat IEC/EN 60068-2-78 T emperature: 40 ±2 °C Unit not

steady state Relative humidity: 93 +2/-3 % operating

Duration: 56 days

Ea Shock IEC/EN 60068-2-27 Acceleration amplitude: 100 gn = 981 m/s2Unit

(half-sinusoidal) Bump duration: 6 ms operating

Number of bumps: 18 (3 each direction)

Eb Bump IEC/EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Unit

(half-sinusoidal) Bump duration: 6 ms operating

Number of bumps: 6000 (1000 in each direction)

Fc Vibration IEC/EN 60068-2-6 Acceleration amplitude: 0.21 mm (10 – 60 Hz) Unit

(sinusoidal) 3 gn = 29.4 m/s2 (60 – 2000 Hz) operating

Frequency (1 Oct / min): 10 – 2000 Hz

Test duration: 7.5 h (2.5 h each axis)

Fda Random vibration IEC/EN 60068-2-35 Acceleration spectral density: 0.05 g n rms Unit

wide band DIN 40046 part 23 Frequency band: 20 – 500 Hz operating

Reproducibility Acceleration magnitude: 4.9 gn rms

high Test duration: 3 h (1 h each axis)

Kb Salt mist, cyclic IEC/EN 60068-2-52 Concentration: 5% (30 °C) Unit not

(sodium chloride Duration: 2 h per cycle operating

NaCl solution) Storage: 40 °C, 93% rel. humidity

Storage duration: 22 h per cycle

Number of cycles: 3

BCD20023 Rev AB, 02-Nov-2010 Page 23 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Since the operating temperature is of major importance to

reliability, the following conditions should be observed:

1. Do not cover heat sinks.

2. Do not obstruct air flow around the heat sinks.

3. Maximize free space around the converter !

4. If the power supplies and the loads are located in the

same enclosure, forced cooling is recommended. The T

units should be placed on the bottom of the enclosure.

5. Always check the maximum ambient and case

temperature after system integration.

Fig. 42

Output power versus ambient temperature of T17xx

Fig. 43

Internal power losses versus nominal output power (T17xx)

Thermal Considerations

Even though the T Series converters have a very high

efficiency, the operating losses will heat the case. The two heat

sinks are designed to dissipate the power losses at maximum

output power over the specified temperature range without

forced cooling, if the convection cooling provides sufficient air

volume, without any obstruction for vertical air exchange below

and above the converter.

Due to the slightly higher power losses in output power and

current limitation mode, the maximum admissible ambient and

case temperature is then lower than in output voltage

regulation mode.

A built-in sensor disables the output in case of over-

temperature. The converter automatically recovers, when the

temperature falls below the limit.

Derating is required for applications with higher operational

ambient temperature. The fig. below shows the derating of the

output power versus operational temperature above the

ambient temperature of 71 °C of an LT17xx unit. Two different

conditions are shown:

a)Converter operating with convection cooling (solid line).

For example if the operational ambient temperature

reaches 80 °C, the output power should be limited to

approx. 290 W. In this case steady operation in output

power or current limitation mode is not possible.

b)Converter operating with forced cooling (dotted line).

Under these conditions, the case temperature TC is

decisive. With sufficient cooling provided (air flow!), the

converter still delivers 550 Watts in voltage regulation

mode even at TA = 85 °C, provided that TC ≤ 95 °C (TC =

measuring point of case temperature; see Mechanical

Data). At TC ≤ 90°C, steady operation in output power or

current limitation mode is still possible. Nevertheless, it is

not recommended to operate the converter continuously

close to TC max, since lifetime will be affected.

–25 50 60 70 80 90 100 T

[°C]0

550

290

[W]

o max

(forced cooling)

o max

(convection

cooling)

Output power/current

limitation mode

>10 A)

Output voltage

regulation mode

<10 A)

08002

0 100 200 300 400 500 600P

[W]

loss

[W]

= 110 VAC V

= 230 VAC

Output current limitation

Output voltage regulation

Output power limitation

08003a

BCD20023 Rev AB, 02-Nov-2010 Page 24 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

111 (= 3U)

94.8

Fixtures for retention clips V

168.5

171.0...171.9

8 1/2 TE

111 (= 3U)

94.8

142.2 (= 28 TE)

5 1/2 TE

1.5

26.8

141.5 (= 28 TE)

0.73

0.3

Trim-potentiometer (Txx40)

Cell voltage selector switch Z (Txx40)

Measuring point 1 of Tc

Sys OK (green)

Vo OK (green)

Test sockets

Error (red)

09036a

Measuring point 2

of case temperature Tc

Input fuse (option)

Measuring point 1

of case temperature Tc

European

Projection

Mechanical Data

Dimensions in mm. The converters are designed to be inserted

into a 19” rack, 160 mm long, according to IEC 60297-3.

Fig. 44

Case T01, weight approx. 3 kg

BCD20023 Rev AB, 02-Nov-2010 Page 25 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

111

101 5

133.4

17.3

168.5

158

119 8

12.35

ø 4.5

Measuring point of case temperature T

Front panel

28.3

09037a

171.0...171.9

European

Projection

Fig. 45

Case T01 with option B1

(cooling plate)

Safety and Installation Instructions

Connector Pin Allocation

The connector pin allocation table defines the electrical

potentials and the physical pin positions at the H15 connector.

Pin 8 and 10 (protective earth) are reliably connected to the

case of the converter . They are leading pins, ensuring that they

make contact with the female connector first.

Pin 16 (HC+) and pin 18 (HC–) are also leading pins to enable

hot-swapping of the converter.

14 16

18 20

22 24

26 28

30 32

10079

Fig. 46

H15 male connector

BCD20023 Rev AB, 02-Nov-2010 Page 26 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Installation Instruction

All T Series converters are components, intended exclusively

for inclusion within other equipment by an industrial assembly

operation or by professional installers. Installation must strictly

follow the national safety regulations in compliance with the

enclosure, mounting, creepage, clearance, casualty,

markings, and segregation requirements of the end-use

application.

Connection to the system shall be made via the female

connector H15 (see Accessories). Other installation methods

may not meet the safety requirements.

The converters are provided with pins 8 and 10 ( ), which are

reliably connected to the case. For safety reasons it is

essential to connect at least one of these pins reliably to the

protective earth (PE) of the supply system.

Input L~ (pin 4) is internally fused. This fuse is designed to

protect the converter in case of overcurrent and may not be

able to satisfy all customer requirements. External fuses in the

wiring to one or both inputs (pin 4 and/or pin 6) may therefore

be necessary to ensure compliance with local requirements. A

second fuse in the wiring to the neutral line N~ is needed, if:

• Local requirements demand an individual fuse in each

source line

• Neutral to earth impedance is high or undefined

• Phase and neutral of the mains are not defined or cannot

be assigned to the corresponding terminals (L~ to phase

and N~ to neutral).

Important: Do not open the converter, or warranty will be

invalidated.

Caution: Prior to handling, the converter must be disconnected

from mains and from other sources (such as batteries).

Hazardous energy levels may be present at the output terminals

for 3 minutes, even after the input voltage has been disconnected

or switched off. This is indicated by the red error LED.

To prevent an unwanted short-circuit across the output of a

disconnected converter, pins 16 and 18 are leading pins. In case

of a short-circuit across the output of a T unit, all LEDs will be off,

even though the mains may be present.

Due to high output current value, the T Series converters

provide for each the positive and the negative output path two

internally parallel connected contacts (pins 12/14 and pins 20/

22). It is recommended to connect the load to both female

connector pins of each path, in order to keep the voltage drop

and power loss across the connector pins as small as possible.

If a T Series converter is used for battery charging, check

whether the position of the cell voltage selector switch

corresponds to the required battery cell voltage.

Caution: Lead-acid batteries can generate H2 and O2 gas, which

can form explosive mixtures. Sufficient ventilation must be

provided in battery cabinets and installation rooms.

Further information about designing battery systems is contained

in VDE 0510, part 2.

If a T Series converters are connected in parallel, it is

recommended to connect the two hot plug-in pins of each

female connector, HC+ (pin 16) and HC– (pin 18), to their

respective output pins Vo+ and Vo– .

Make sure that there is sufficient air flow available for

convection cooling. This should be verified by measuring the

case temperature, when the converter is installed and

operated in the end-use application. The maximum specified

case temperature TC max must not be exceeded. See also

Thermal Considerations.

If the end-product is to be UL certified, the temperature test

may be repeated as part of the end-product investigation.

Ensure that a converter failure (e.g., by an internal short-

circuit) does not result in a hazardous condition. See also

Safety of Operator-Accessible Output.

Protection Degree and Cleaning Agents

If the female connector is fitted, the protection degree is IP30.

Since the converters are not hermetically sealed, any

penetration of cleaning fluids must be prevented.

Audible Noise

Under certain operating conditions, a T Series converter may

generate a slight audible noise due to magneto-striction in the

transformer. This noise does neither affect the function of the

converter, nor is it detrimental to its performance over time.

Standards and Approvals

All T Series converters correspond to class I equipment. They

comply with IEC/EN 60950-1, are CE-marked and safety-

approved by CSA to UL/CSA 60950-1. They have been

evaluated according for:

Table 19: Connector pin allocation

Pin Electrical determination Designation

4 Phase line input L~

6 Neutral line input N~

8 1 Protective earth PE 1

10 1 Protective earth PE 1

12 Output voltage positive V o+

14 Output voltage positive V o+

16 1 Hot plug-in contact positive HC+

18 1 Hot plug-in contact negative HC–

20 Output voltage negative V o –

22 Output voltage negative V o –

24 System Good signal input Sys In

26 System Good signal output Sys Out

28 Inhibit or remote control input i/Vcr

30 Power Down signal D

32 Power Down signal threshold of VoD set

1 Leading pin (pre-connecting)

BCD20023 Rev AB, 02-Nov-2010 Page 27 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

MI for

output

leakage

current

Vo+

Vo–

10071a

MI for

earth

leakage

current

L2 Converter

MI for

output

leakage

current

Vo+

Vo–

10070a

MI for

earth

leakage

current

Converter

Fig. 48

Test set-up for leakage current in single phase configuration.

S1 is used to simulate the interchanging of phase and

neutral. S2, S3 select either the earth or output leakage

current test, S4 selects either the positive or negative output.

• Building in

• Basic insulation between input and case, based on

250 VAC

• Double or reinforced insulation between input and output,

based on 250 VAC

• Operational insulation between output and case

• The use in a pollution degree 2 environment

• Connecting the input to a primary circuit with a maximum

transient rating of 2500 V (overvoltage class III based on a

110 VAC primary circuit, overvoltage class II based on a

230 VAC primary circuit).

The converters are subject to manufacturing surveillance in

accordance with the above mentioned UL standards and with

ISO9001:2000.

For details see the Declaration of Conformity.

Isolation

The electric strength test is performed in the factory as routine

test in accordance with EN 50116 and IEC/EN 60950 and

should not be repeated in the field. Power-One will not honor

any warranty claims resulting from electric strength field tests.

Table 20: Isolation

Characteristic Input to case Output to Temp. Sensor T Unit

and output case output to case

Electric Factory test ≥1 s 2.8 1 1.4 1.4 kVDC

strength AC test voltage equivalent 2.0 1.0 1.0 kV AC

test to factory test

Insulation resistance at 500 VDC >300 >300 >100 MΩ

1According to EN 50116 and IEC/EN 60950-1, transformers and subassemblies connecting input to output are pretested with 5.6 kVDC or

4.0 kVAC.

Fig. 47

Measuring instrument (MI) for earth leakage current test

according to IEC/EN 60950, Annex D.

Leakage Currents

Leakage currents flow due to internal leakage capacitance

and RFI suppression Y-capacitors. The current values are

proportional to the input voltage and frequency. They are

specified at maximum operating input voltage, where phase,

neutral, and protective earth are correctly connected, as

required for class I equipment.

Under test conditions, the leakage current flows through a

measuring instrument (MI) as described in the fig. below , which

takes into account impedance and sensitivity of a person

touching unearthed accessible parts. The current value is

calculated by dividing the measured voltage by 500 Ω. If inputs

and/or outputs of converters are connected in parallel, their

individual leakage currents are added.

500 Ω

1500 Ω

10 kΩ220 nF

22 nF

10061

Fig. 49

Test set-up for leakage current in 208 V phase to phase

configuration. S2, S3 select either the earth or output leakage

current test, S4 selects either the positive or negative output.

BCD20023 Rev AB, 02-Nov-2010 Page 28 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Table 21: Leakage currents

Characteristic LT/UT Unit

Earth leakage Permissible according to IEC/EN 60950 3.5 m A

current Specified value at 255 V, 50 Hz (LT) 1.8 1

Specified value at 127 V, 60 Hz (LT or UT) 1.1 1

Output leakage Permissible according to IEC/EN 60950 0.25

current Specified value at 255 V, 50 Hz (LT) <0.1

Specified value at 127 V, 60 Hz (LT or UT) <0.1

1In phase to phase configuration, the leakage current is lower.

Fig. 50

Schematic safety concept

AC-DC

converter

Mains SELV

Earth

connection

–

10021a

Fuse

Fuse Output

Safety of Operator-Accessible Output Circuits

If the output circuit of a converter is operator-accessible, it

shall be an SELV according to the safety standard IEC/EN

60950.

The following table shows a possible installation configuration,

compliance with which causes the output circuit to be an SELV

circuit up to a configured output voltage (sum of nominal

voltages if in series or +/– configuration) of 56.5 V.

However, it is the sole responsibility of the installer to assure

the compliance with the relevant and applicable safety

regulations.

Table 22: Safety concept leading to an SELV circuit

Conditions AC-DC converter Inst allation Result

Supply voltage Grade of isolation between input and Measures to achieve the resulting Safety status of the AC-DC

output, provided by the AC-DC safety status of the output circuit converter ouput circuit

converter

Mains ≤250 VAC Double or reinforced Installation according to the applicable SELV circuit

standards

Description of Options

D Undervoltage Monitor

This option is designed for systems using backplanes or is

intended for use in applications, where a fuse or a decoupling

diode is fitted into the positive supply line to the system bus.

The status of the system bus/battery voltage can be monitored

rather than the output status of a single T unit. Input D set (pin

32) is not internally connected to Vo+ ( Rint is missing; see fig.

20).

To maintain the adjustment capabilities and resistor values for

setting the different threshold values, a 43.2 kΩ (21.5 kΩ)

resistor should be fitted into the sense line to the bus. If D set

(pin 32) is left open, output D (pin 30) is permanently signaling

low bus voltage.

For details see also Auxiliary functions, Power Down.

F Externally Accessible Fuse

The standard T converters have a non-accessible fuse, 5 × 20

mm. Some applications require an externally accessible fuse.

Option F provides a fuse mounted on the rear side; see

Mechanical Data.

B1 Cooling Plate

If a cooling surface is available, the converters can be

provided with a mounting plate (option B1) instead of the

standard heat sink on the right-hand side; see Mechanical

Data.

Since approximately 50 % of the losses have to be dissipated

through the remaining heat sink on the left-hand side, suf ficient

free air flow must still be provided.

BCD20023 Rev AB, 02-Nov-2010 Page 29 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Accessories

A variety of electrical and mechanical accessories are

available, including:

– Mating H15 connectors with screw, solder, faston, or

pressfit terminals

– Connector retention clips V [HZZ01209]

– Connector retention brackets CRB [HZZ01216]

– Cable hood [HZZ00141] with retention brackets

[HZZ01218]

– Code key system for connector coding

– Temperature sensor T for battery charging

– Front panels for 19" DIN-rack mounting, Schroff system

– 19" DIN-racks for system integration

– Backplanes for system integration matching to 19” DIN-

rails.

For additional information go to www.power-one.com .

Fig. 54

Backplane for system intergration

Fig. 53

19" DIN-rack

Fig. 51

H15 female connector (with

code system)

Fig. 52

Connector retention

clip V

T Series Front Panels 28 TE

This front panel fits to all T Series converters with case size T01.

Table 23: T case front panel selection

Width Case Series Type

TE mm size item no.

28 141.9 T01 T G28-T01 met [HZZ00890]

28 141.9 T01 T G28-T01 plas [HZZ00837]

Delivery content:

Front panel with two grey plastic handles, three countersunk

screws, set of four plastic or metal retainers with captive

screws, and assembly instructions.

G28-T01 met [HZZ00890] with metal screw retainers

G28-T01 plas [HZZ 00837] with plastic screw retainers.

Blind plates: To close a non fully equipped 19" DIN-rack (only

one or two converters fitted), 28 TE wide blind plates without

holes are available:

G28-T01-blank met [HZZ 00847] with metal screw retainers

G28-T01-blank plas [HZZ 00848] with plastic screw retainers.}

Fig. 55

Front panels for T Series (case T01)

128.4

26.2 ±0.1 2.5 ±0.1

9.7 ±0.1 103

141.9

0.2 122.4

56.7 29

81.8 ±0.1

12006a

European

Projection

BCD20023 Rev AB, 02-Nov-2010 Page 30 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Temperature Sensors T

The T Series battery chargers exhibit a cell voltage selector

switch Z to set the required floating charge voltage at 20 °C

directly at the converter. If this Z switch is used, the 2.23 V/cell

sensor types should be selected in any case as a basis, and

the selection criteria are only the temperature coefficient and

the nominal voltage of the battery. For example, if a 24 V

battery is used, which has a cell voltage of 2.23 V and a cell

temperature coefficient of –3.5 mV/K, the sensor type is S24-

2.23-35-02. The setting on the Z switch should be 2.23.

Table 24: Type survey temperature sensors T

Nominal battery Sensor type Cell voltage Temp. coefficient per cell Cable length

voltage [V] [V] [mV/K] [m]

24 S24-2.23-30-02 2.23 –3.0 2

24 S24-2.23-35-02 2.23 –3.5 2

24 S24-2.23-45-02 2.23 –4.5 2

36 S36-2.23-30-02 2.23 –3.0 2

36 S36-2.23-35-02 2.23 –3.5 2

36 S36-2.27-35-02 2.27 –3.5 2

48 S48-2.23-30-02 2.23 –3.0 2

48 S48-2.23-35-02 2.23 –3.5 2

48 S48-2.23-40-02 2.23 –4.0 2

48 S48-2.23-45-02 2.23 –4.5 2

48 S48-2.27-30-02 2.27 –3.0 2

48 S48-2.27-35-02 2.27 –3.5 2

48 S48-2.27-45-02 2.27 –4.5 2

For T Series converters without Z selector switch, a sensor

according to both criteria should be selected. In our example it

should be S24-2.23-35-02.

The active temperature sensor T is of robust construction,

mounted into a sealed aluminium tube of 12 mm outer

diameter and 50 mm length. The sensors are waterproof

(IP 66) and high-voltage tested with 1.4 kVDC. Connection

should be done via the colored 3 wire cable to the output of the

converter (V o+ and Vo–) and the remote control input i/Vcr (pin

28).

Caution: Wrong connection may damage the sensor and the

converter.

Note: Battery specific sensors with cell voltages from 2.23 V up to

2.32 V and temperature coefficients from –2 up to –4.5 mV/K per

cell or different cable lengths are available upon request.

Note: For installation of batteries, see VDE 510 as well as the

recommendations of the battery manufacturers.

+–

Battery

Vo+

i/Vcr

Vo–

Sensor

cable

Sensor

wires

05064b

green

brown

white

Fuse

–

Sensor T

Converter

Fig. 56

Wiring diagram sensor

Table 25: Sensor data

Characteristics Condition min typ max Unit

Tsensor Sensor temperature range Vcr = 5.5 – 11.5 V –10 60 °C

Vcr Control voltage range Absolute ratings 3.9 15 V

Vcr td Control voltage tolerance Tsensor = 20 °C ±0.1

Tsensor = 0 – 53 °C ±0.2

BCD20023 Rev AB, 02-Nov-2010 Page 31 of 31 www.power-one.com

T Series Data Sheet

500 W att

AC-DC

Converters

Fig. 57

Sensors connected in parallel.

Sensors in parallel provide redundant voltage adjustment in

case of one of the sensors goes into an open-circuit or short-

circuit condition (add. external components required)

Vo+

Vo–

i/Vcr

Sensor Sensor

200 kΩ200 kΩ

06078a

Converter

If sensors are connected in parallel (redundant configuration),

they should be decoupled by 200 kΩ resistors; see fig. below.

An individual sensor for each parallel connected T converter is

not recommended, because current sharing is affected by the

sensor tolerance.

Fig. 58

Mechanical dimensions (in mm)

European

Projection

Fig. 59

Temperature sensor T with mounting fixture.

NUCLEAR AND MEDICAL APPLICA TIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components

in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the

respective divisional president of Power-One, Inc.

TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the

date manufactured. Specifications are subject to change without notice.

length l: 2 m (standard)

25 ± 0.2

adhesive tape

14.5

09044b

fixture YVM009