S8T-DCBU-01 - Omron Automation and Safety

CSM_S8T-DCBU-01_DS_E_7_1

DC Backup Block for S8TS

S8T-DCBU-01

DC Bac kup Bloc k for S8TS Prevents 24-VDC

Outages Due to Power Interruptions or Failures

• Supplies 24 VDC for a fixed period of time even during

AC input outages to considerably improve system reliability.

• Block Power Supply Basic Block is connected using a Bus Line

Connector to achieve a simple system configuration.

• Notification of alarms is provided by indications on the main unit

and alarm signal output.

• RoHS-Compliant

Ordering Information

Note: For details on normal stock models, contact your nearest OMRON representative.

■DC Backup Block (See note 1.)

Note: 1. One S8T-BUS03 Connector is included as an accessory.

2. The output current can be selected by a switch.

■Bus Line Connector

Note: One package contains 10 S8T-BUS03 Connectors.

■Basic Block

Note: Use S8T-DCBU-01 in a pair with the Block Power Supply Basic Block.

■Battery Holder

Note: Can be set two batteries.

■Battery

Note: A set of two batteries.

Designated battery varies on the number of multi-connected S8TS-06024@.

Refer to “Number of Multi-Connected S8TS-06024

and Designated Battery” on page 2.

!Refer to Safety Precautions for All Power Supplies and Safety

Precautions on page 15.

Block Power Supply Basic BlockDC Backup Block

For the most recent information on mo dels that have been certified for

safety standards, refer to your OMRON website.

Input voltage Output voltage Output current Model number

24 to 28 VDC 24 V 3.7 A/8 A (See note 2.) S8T-DCBU-01

Type Number of Connectors Model number

DC Bus Line Connector 1 S8T-BUS03

10 (See note.) S8T-BUS13

Type Output voltage/Output current Model number

Screw terminal type With Bus Line Connectors 24 V/2.5 A S8TS-06024-E1

Without Bus Line Connectors S8TS-06024

Connector terminal type With Bus Line Connectors S8TS-06024F-E1

Without Bus Line Connectors S8TS-06024F

Model number

S82Y-TS01

Model number

S82Y-BAT01

S82Y-BAT02

S8T-DCBU-01

Basic Configuration

■Number of Multi-Connected S8TS-06024@ and Designated Battery

Note: 1. The designated battery is rated at 12 V. Use two batteries in series.

2. S8T-DCBU-01 shall be connected with S8TS-06024@ when in use.

3. A set of two batteries.

Area where battery is sold Japan Europe Areas other than Japan

and Europe

Overload

protection

operating

point selector

Max. No. of

connected

S8TS-06024@

units

S82Y-BAT01 S82Y-BAT02 LC-

R122R2PG LC-

R123R4PG LC-

R122R2P LC-

R123R4P

5.7 A (typical) 2 (3 in the case of N+1

redundant operation) Yes Yes Yes Yes Yes Yes

11.7 A

(typical) 4 (5 in the case of N+1

redundant operation) —— Yes —— Yes —— Yes

S8T-BUS01

Bus Line Connector

(Order separately)

Connect to

Loads

Connect to

Batteries

Connect to

AC Lines

S8TS-06024@

Block Power Supply Basic Block

(Order separately) S8T-BUS03 Bus Line Connector

S8T-DCBU-01 DC Backup Block

S82Y-TS01 Battery Holder

(Order separately)

Note: One S8T-BUS03 Connector is included with the

S8T-DCBU-01 DC Backup Block.

Note: S8T-BUS01 Connector is used

for connecting to the

S8TS-06024@ Basic Block.

Normal operation AC interrupted

Designated external

battery Designated external

battery

Backup

Block

Backup

Block 24-VDC output

Monitor Monitor

100 to 240 VAC 100 to 240 VAC

Charge Discharge

24 V

2.5 A 24 V

2.5 A

Improve system reliability by

using DC Backup Blocks.

S8T-DCBU-01

Specifications

■Ratings/Characteristics

Note: 1. Refer to Output Voltage Adjustment for S8TS-06024

on page 6.

2. The output specifications are defined at power output terminals.

3. Specified by performance of S8TS-06024@ Basic Block.

4. Specified by S8TS-06024@ connection.

5. The output voltage will be 21.0 V (min.) when switching to backup operation.

6. The life of the battery will greatly reduced when operating below the minimum output. Design the loadcircuit so that at least the minimum

output is maintained.

7. Refer to Backup Time (Reference Value) on page 12.

8. Refer to Functions on page 7 for details.

9. Set the detection current to 20 mA × N, where N is the number of S8TS-06024@ Basic Blocks connected.

10. Be sure to mount End Plates (PFP-M) on both ends of the Power Supply.

11. To ensure Class 2, take one of following measures.

Note that the number of S8TS-06024@ to be connected to the S8T-DCBU-01 shall be one.

•Connect S8T-DCBU-01 to S82Y-TS01 having its fuse replaced with an UL-Listed and DC rated

32 VDC min./3 A max. one.

•Connect an UL-Listed and DC rated 32 VDC min./2.5 A max. fuse at the location shown in Fig.1.

Item Model S8T-DCBU-01

Input Voltage (See note 1.) 24 to 28 VDC

Output

(See

note 2.)

Normal

operation Voltage 24 VDC (See note 3.)

Load variation infl uence (See note

4.) 6% max.

Backup

operation Voltage 21.0 to 27.4 VDC (See no te 5.)

Min. output cur-

rent (See note 6.) S82Y-BAT01 0.11 A

S82Y-BAT02 0.17 A

Backup time

(reference value)

(See note 7.)

S82Y-BAT01 8 min/3. 7 A (at 25•C, batter y fully charged, start of battery service life)

S82Y-BAT02 4 min/8. 0 A (at 25•C, batter y fully charged, start of battery service life)

Charg-

ing Method Stable voltage/current charging method

Charging voltage (See note 8.) 27.4 V/26.2 V (typical)

Max. charging current 0.35 A (typical)

Overvoltage protection (S ee note 8.) Yes (30 V typical)

Addi-

tional

func-

tions

Protection

functions Overdischarge protection

(See note 8.) Yes (18.5 V typical)

Overload protection

(See note 8.) Yes (5.7 A/11.7 A typical)

Battery misconnection protection

(See note 8.) Yes

Input func-

tion Backup ON/OFF input

(See note 8.) Yes

Output

functions Output indicato r Yes (color: green)

Battery status indicato r

(See note 8.) Yes (color: red)

Battery status output

(See note 8.) Yes (relay: 24 VDC, 0.1 A)

Backup status indicator Yes (color: red)

Operation mode out put Yes (relay: 24 VDC, 0.1 A)

Other Ambient operating temperature

(See note 4.) Operating: Refer to the derating curve in Engineering Data. (with no condensation or icing)

Storage: −25 to 65•C

Ambient hu m id ity Operating: 25% to 85%; Storage: 25% to 90%

Dielectric strength

(See notes 4 and 9.) 3.0 kV A C for 1 minute (between all S8TS-06024@ AC inputs, and all S8T-DCBU-01 terminals/

all S8TS-06024@ outputs; detection current: 20 mA)

2.0 kVAC for 1 mi nute (between all S8TS-06024@ AC inputs and PE terminal; detection cur-

rent: 20 mA)

1.0 kVAC for 1 mi nute (between all S8T-DCBU-01 terminals/all S8TS-06024@ outputs, and

PE terminal; detection current: 20 mA)

Insulation resistance (See note 4.) 100 MΩ min. (between all S8T-DCBU-01 terminals and all S8TS-06024@ output s, and be-

tween all S8TS-06024@ AC inputs and PE terminal) at 500 VDC

Vibration resistance (See notes 4 and 10.) 10 to 55 Hz, 0.37 5-mm single amplitude for 2 h each in X, Y, and Z directions

Shock resistance (See notes 4 and 10.) 150 m/s2, 3 times ea ch in ±X, ±Y, and ±Z directions

EMI (See

note 4.) Conducted Emission Conforms to EN61204-3 EN55011 Class A and based on FCC Class A

Radiated Emission Conforms to EN61204-3 EN55011 Class A

EMS (See note 4.) Conforms to EN61204-3 High severity levels

Approved

standards UL:

cUL:

cUR:

EN/VDE

UL508 (Listing: Class 2: Per UL1310) (See note 11.), UL60 950-1

CSA C22.2 No. 14 (Class 2: Per No.223) (See note 11.)

No. 60950-1

EN50178 (=VDE0 160), EN60950-1 (=VDE0805 Teil 1)

Size 120 × 1 20 × 43 mm

Weight 350 g

S8T-

DCBU-

S8TS-

06024

-V+V

-V

(Fig. 1)

S8T-DCBU-01

Connections

■Block Diagram

Operation

■Operating Procedures

Battery Connection

Using the S82Y-TS01 Battery Holder is recommended for connecting

and installing the battery. If the S82Y-TS01 is used, connect a switch

and fuse between the battery and the S8T-DCBU-01. Refer to

Battery Holder S82Y-TS01 on page 6 f or details on ho w to select and

install the switch and fuse.

Battery Overdischarge

The battery will discharge according to the conditions given it items 1

to 3, below. Battery overdischarge may result in backup incapacity

due to extremely shortened service life and an inability to recharge.

Perform the following actions to prevent overdischarge.

1. Discharge Due to Load in Backup Operation (See note 1.)

Using the discharge protection function, rapid discharge is

prevented by the battery connection terminal voltage

automatically stopping backup operation at appro ximately 18.5 V.

The standby current of the product, however, may result in

continued discharge and overdischarge if discharge is performed

after backup operation has been stopped. Theref ore , ref er to item

2. Discharge Due to S8T-DCBU-01 Standby Current (See note 1.)

The AC po wer will turn OFF due to the standby current generated

in the circuit configuration, and discharge will continue ev en if the

load is no longer operating. In cases such as those described in

Table 1, disconnect the battery to prevent overdischarge.

(1) Set the Battery Holder switch to OFF. (See notes 2 and 4.)

Connect the external circuit shown in Figure 1 to protect

against forgetting to change the switch. (See note 8.)

(2) Open the backup ON/OFF input using an external signal and

disconnect the battery using an external relay. (See Figure 1

and notes 2, 4, and 8.)

Table 1: Usage with Possible Overcharge Due to Standby

Current

Note: 1. The standby current of the S8T-DCBU-01 will cause the battery to

discharge after backup operation has stopped because of the discharge

protection function or the backup ON/OFF input is opened.

2. Before turning ON the AC power, turn OFF the Battery Holder switch or

switch SW shown in Figure 2. Unnecessary backup operation will shorten

the service life of the battery because of the two reasons listed below.

Also, be sure to turn ON the Battery Holder switch or s witch SW shown in

Figure 2 when turning ON the AC power.

BAT+

BAT−

DC (+)

DC (−)

−V

Charging

circuit

Input

voltage

detection

Detection resistorDischarge circuit

Battery misconnection

protection circuit

Bypass D

Fuse

2.0 A

Discharge

control

circuit

Battery

ON/OFF

input

Connector for

Bus Line

Connector

Connector for

Bus Line

Connector

Overcurrent

detection

DC OUTPUT

Operation

mode

output

Battery

status

output

Overdis-

charge

detection

Battery

voltage

detection

S8T-DCBU-01

Battery not disconnected

Extreme

shortening of

battery life due to

frequent backup

operations or

insufficient

charging

Backup

incapacity

due to batt ery

overcharge

and inability

to recharge

Turning OFF the AC power

after assembly and

installation (See note 7.)

--- Possible

Turning OFF the AC power

during maintenance or

inspection

--- Possible

Fre-

quently

turning

the AC

power

OFF

Turning OFF the A C

power during lunch

breaks (1 hour/day)

Possible ---

Turning OFF the A C

power at night (16

hours/day)

Possible ---

Turning OFF the A C

power on Saturdays

and Sundays

Possible Possible

Turning OFF the A C

power during long

vacations

--- Possible

Storage or shipment --- Possible

Long-term power outage --- Possible

S8T-DCBU-01

•A period of 24 to 48 hours is required to fully charge the battery. If backup

operation is performed before the battery is fully charged, the reduced

charge will result in shortened battery service life.

•The battery service life will be shortened with each repetition of charging

and discharging.

3. If the battery connection terminal voltage is 15.5 V (typical) or lower, the

incorrect battery connection protection function will be activated, and

charging will not be performed. When the battery is nearing the end of its

service life (i.e., when the battery capacity is half its initial capacity),

recharging and backup may not be possible if only the battery has been

left turned AC power OFF for about two days (at an ambient temperature

of 25°C). Refer to Incorrect Battery Connection Protection on page 8.

4. Do not use the S8T -DCBU-01 in locations subject to corrosive gases , such

as silicon gas, sulfuric gas, organic gas, or chlorine gas. If relays (X in

Figure 1 and Figure 2) or switches (Battery Holder and switch SW in

Figure 2) are used or left in atmospheres with corrosive gas, corroded

contact surfaces may cause contact instability or contact failure and

render battery backup or backup operation impossible.

5. The ambient operating temperature and humidity for the LY1-D (24 VDC)

are given in the following table. The LY1-D (24 VDC) has a built-in diode

to absorb inverted voltage that is generated from the operating coil. The

operating coil therefore has polarity. Take this into account when

performing wiring. Refer to individual datasheets for details.

6. A voltage of approximately 15 V is applied to s witch SW in Figure 2 when

it is open and a current of approx. 2 mA when it is shorted. Take this into

account when selecting a switch.

7. The standby current will flow and discharging will continue if only the

battery is wired and left without wiring the AC power.

8. If the user has forgotten to turn OFF the Battery Holder switch in Figure 1

or switch SW in Figure 2, backup operation will continue until the battery

connection terminal voltage reaches 18.5 V (typical), and then the battery

will be disconnected by the relay (X). If the battery is left in this condition

for a period exceeding the times giv en in the following table , self-discharge

will cause the battery to continue ov erdischarging, which may result in the

inability to recharge and perform backup.

Figure 1 Overdischar ge Protection Circuit When the User Forgets to Turn

OFF the Battery Holder Switch

The following will occur is you forget to turn OFF the Battery Holder

switch.

a. Backup operation will start after the A C pow er has been turned

OFF.

b. When the battery connection terminal voltage reaches 18.5 V

(typical), backup operation will stop, the relay contacts will

open, and the battery will be disconnected from the DC Backup

Block.

Figure 2 Overdischarge Protection Cir cuit Using an External Signal

a. The backup ON/OFF input is opened (making backup

impossible) by the external signal (e.g., a switch).

b . If the AC power has been tuned OFF, 24 VDC will turn OFF, the

contacts will open, and the DC Backup Block will be

disconnected.

3. Battery Discharge Due to Self-discharging

Even if the S8T-DCBU-01 Battery is disconnected, it will

discharge naturally. To prev ent o verdischarge, charge the Battery

completely before storing it for an extended period of time or

shipping it, and then charge it at the interval given below.

Model Ambient operating temperature Ambient

operating

humidity

LY1-D

(24 VDC) Output current of 4 A max.: −25 to 55°C

Output current of 4 A min.: −25 to 40°C5% to 85%

S82Y-BAT01

Ambient

temperature Load

current Estimated months battery can be left

until incapable of recharging

Start of battery life End of battery life

20°C 0.11 A 1.0 0.5

2.2 A 2.0 1.0

40°C 0.11 A 0.5 0.25

2.2 A 1.0 0.5

S82Y-BAT02

Ambient

temperature Load

current Estimated months battery can be left

until incapable of recharging

Start of battery life End of battery life

20°C 0.17 A 1.0 0.5

4.8 A 3.0 1.5

40°C 0.17 A 0.5 0.25

4.8 A 3.0 1.5

Ambient temperature Months between charging

20°C or less 9

20 to 30°C6

30 to 40°C3

S82Y-TS01 (Battery Holder)

S8T-DCBU-01

LOAD

LN+−

+V−V

−V

S8TS

-06024@

LY1-D (24 VDC)

Specified relay (X): OMRON LY1-D (24 VDC)

(See note 5 on page 5.)

(Backup ON/OFF input)

S82Y-TS01 (Battery Holder)

S8T-DCBU-01

S8TS-06024@

LOAD

+V−V

−V

+−

SW (See note 6.)

Specified relay (X): OMRON LY1-D (24 VDC)

(See note 5 on page 5.)

S8T-DCBU-01

Backup Function

S8T-DCBU-01 detects output voltage drop of S8TS-06024@ to

switch to backup operation.

Backup operation continues for about 7 seconds even after the

output voltage of S8TS-06024@ is restored.

Note:(1) If this state occurs, the S8TS-06024@ ma y be overloaded or malfunctioning.

Immediately eliminate the cause of the trouble.

(2) If switching between backup operation and normal operation is repeated,

the output voltage changes accordingly.

(3) The contact capacity of the relay is 24 VDC 0.1 A.

(4) Do not use the S8TS-06024@ with sudden load fluctuations or load peaks

exceeding the rated current. Doing so will cause the output voltage of the

S8TS-06024@ to drop and backup to be performed, and may shorten the

battery service life.

(5) The maximum inrush current specified below flows when backup operation

starts.

Charging Circuit

Charging Time (Reference Values)

Note: The battery takes the time specified above to be charged.

If power is interrupted for shorter than the necessary charging

time (i.e., power failure immediately after installation or

repeated short power failures), backup operation may not

continue for the necessary time.

Output Voltage Adjustment for

S8TS-06024@

The DC Backup Block detects a drop in the output voltage (approx.

23 VDC) of the connected S8TS-06024@ to switch to backup

operation.

The output voltage of the S8TS-06024@ can be adjusted using the

output voltage adjuster. Do not, however, set the output voltage to

lower than the factory shipment setting, if the S8TS-06024@ is used

connected with a DC Backup Block.

Wiring Length between S8T-DCBU-01

and Battery

Connect S8T-DCBU-01 and the battery using a cable having a wire

diameter specified in Recommended Wire Diameter on page 16

within a wiring length of 1.5 m.

Because the battery voltage is monitored at the battery connecting

terminal, a large wiring impedance increases the voltage drop from

wiring, reducing the backup time.

Battery Holder S82Y-TS01

We recommend using the S82Y-TS01 Battery Holder for connecting

and installing the battery. Take the following points into consideration

when using the S82Y-TS01:

(1) Contact between leaking battery fluid and metal par ts having an

electric potential may cause ignition or fire. To prevent this, the

Battery Holder uses a resin battery tra y. Install the Battery Holder

in the direction shown in the following figure.

(2) The inrush current shown below flows when backu p operation is

switched to. The peak value and time of this inrush current vary

according to the capacity of the input capacitor of the connected

equipment, battery charge status, battery wiring length, and

ambient temperature. The switch and fuse of the S82Y-TS01 are

selected taking this inrush current into consideration. When

replacing the fuse, use only the specified fuse. (Littelfuse,

0287015* (15 A))

* The previously specified 257015 has been discontinued.

(3) In the event that the battery generates inflammable gases, place

the switch and fuse away from the convection path of the inflam-

mable gas to pre vent the switch or fuse from causing ignition and

explosion.

(4) If the S8T-DCBU-01 is stored with the AC power tuned OFF but

the battery still connected, the standby current of the S8T-DCBU-

0 may cause the battery to discharge, considerably reduce the

service life of the battery, and render recharging and backup

impossible. To prevent this, turn OFF the switch. (Refer to Bat-

tery Overdischarge on page 4.)

Backup status LED

(BACKUP:

Red)

Relay

(OPN MODE)

Power failure Continuous

backup

operation

Lit Backup

(1)-(2): ON

Failure

of one

unit of

S8TS-

06024@

During

operation

of one unit

of S8TS-

06024@

During

operation

of multiple

units of

S8TS-

06024@

Repetition of

switching

between

Normal

operation and

Backup

operation at an

interval of about

7 seconds

Blink at an

interval of

about 7

seconds

Repetition of

switching

between Normal

((3)-(2): ON)

and BACK UP

((1)-(2): ON) at

an interval of

about

7 seconds.

Upon activation of

overload protection

function of S8TS-

06024@ (See note.)

Battery used 100% charged 80% charged

LC-@122R2@@ 24 to 48 hours 5 hours

LC-@123R4@@ 8 hours

COM

Normal

Backup

LED lit

(DC ON: Green)

LED lit

(BACKUP: Red)

Relay (OPN MODE)

(1)-(2): ON

Operation mode

output relay

Indicator

025 ms Time

Battery charge status: Fully charged

Battery ambient temperature: 40°C

Input capacitor of connected equipment: 56,000 µF

Load power: 192 W

Inrush current (A)

025 ms Time

Battery charge status: Fully charged

Battery ambient temperature: 40°C

Input capacitor of connected equipment: 56,000 µF

Load power: 192 W

Inrush current (A)

S8T-DCBU-01

Inserting and Removing the Bus Line

Connector

Pay attention to the following points to maintain electric

characteristics.

Do not insert/remove the Connectors more than 20 times.

Do not touch the Connector terminals.

To remove the Connectors, insert a flat-bladed screwdriver

alternately at both ends.

S8T-BUS03

Use the S8T-BUS03, which connects only the DC lines. (AC line not

connected).

S8T-BUS03 is equipped with a selector to prevent incorrect

connection to a power supply unit with a different output voltage

specification. Slide the selector to the 24 V position.

Mounting

Mounting Direction

Use standard mounting only. Improper mounting will interfere with

heat dissipation and may result in deterioration or damage to internal

parts.

Operation Check

After connecting the S8TS-06024@ and S8T-DCBU-01, it is

recommended to use the following procedure to check whether the

DC Backup Block is operating correctly.

1. Turn ON the Battery Holder.

2. Turn ON the AC power of the S8TS-06024@.

3. W ait for at least 10 s, and then check if the DC Backup Bloc k is in

the following status.

4. Turn OFF the AC power of the S8TS-06024@.

5. Confirm that backup operation is correctly performed as shown

below.

6. Turn ON the AC power of the S8TS-06024@.

Note: 1. Check operation after arranging a state where no fault occurs even if the

connected devices are turned OFF in the midway.

2. The operation mode may not changed to Backup, if AC power is turned

OFF within 10 sec. at Step 3.

3. After checking operation, f ollow the points listed in Battery Overdischarge

on page 4 if the AC power is tuned OFF or the equipment is stored or

shipped.

■Functions

Charging Voltage Selector

Select either 27.4 V or 26.2 V at the

charging voltage selector to select the

charging voltage.

The shipment setting is 27.4 V.

Because the battery manufacturer

recommends 27.4 V as charging voltage, it

is recommended to charge at 27.4 V.

In this case, 27.4 VDC, which is the

charging voltage of the batteries, may

output depending on the state of

connected load when the operation mode

changes to Backup.

Note: If the battery is charged at 26.2 V, the battery capacity

decreases each time the battery is charged, and the backup

time gradually decreases.

The values shown below are for reference only.

Standard mounting Yes

Face-up mounting No

Other mounting No

−V+V−V+V

−LNGR

S8T-BUS03S8TS-06024@

S8T-DCBU-01

Selector

Correct Incorrect

Standard mountingFace-up mounting

Capacity reduction in each charge-and-discharge cycle

At 25•C Reduction by 10%

At 0•C Reduction by 20%

COM

LOW

Relay (BAT LOW)

(6)-(5): ON

Battery status

output relay

LED lit

(DC ON: Green) Relay (OPN MODE)

(3)-(2): ON

Operation mode

output relay

Indicator

COM

Normal

Backup

COM

LOW

Relay (BAT LOW)

(6)-(5): ON

Battery status

output relay

LED lit

(DC ON: Green)

LED lit

(BACKUP: Red)

Relay (OPN MODE)

(1)-(2): ON

Operation mode

output relay

Indicator

COM

Normal

Backup

Terminal

block cover

Overcurrent protection

operating point selector

Section A

Charging voltage selector

Enlarged View of

Section A

S8T-DCBU-01

Overvoltage Protection Circuit

If the charging voltage is about 30 V or abov e, the charging v oltage is

cut off to prevent the battery from being overcharged.

How to Reset Overvoltage Prot ection

Reset Overvoltage protection with following steps after arranging a

state where no fault occurs even if the connected devices are turned

off in the midway.

1. Turn OFF the Battery Holder.

2. Turn OFF the AC power of the S8TS-06024@.

3. Leave the power OFF for 1 minute or more.

4. Turn ON the Battery Holder.

5. Turn ON the AC power of the S8TS-06024@ again.

Note: 1. Do not turn ON the input power again until the cause of the overvoltage

has been removed.

2. As an AC input OFF status is the same as a power f ailure, the S8T-DCBU-

01 will perform backup operation. Sometimes backup operation cannot be

performed for the required backup time as the battery is not sufficiently

charged. For this reason, first make sure that backup operation is not

needed before turning the battery holder OFF and then the AC input

power OFF.

3. The time required for reset is specified for connection of five units of

S8TS-06024@, without a load, and fully charged batteries.

Overload Protection Operating Point

Selector

5.7 A (typical) or 11.7 A (typical) can be

selected with the selector as an overload

protection operating point during backup

operation. Select 5.7 A (typical) for one or

two units of S8TS-06024@ (or three units

during N+1 redundancy operation), or

select 11.7 A (typical) for three or f our units

(or five units during N+1 redundancy

operation). The shipment setting is 5.7 A

(typical).

Overload Protection Function

During Normal Operation

Notification of an overload status is provided in the following way.

•LED (BAT LOW: Red) lights up.

•Relay (BAT LOW) is in the LOW mode ((4)-(5): ON).

If power f ailure occurs in this state , an o verload protection function is

activated to fail to backup.

During Backup Operation

The overload protection operating point can be selected from either

5.7 A (typical) or 11.7 A (typical) using the overload protection

function selector. The output is cut off when overload protection is

activated.

Note: Continuation of operation in the overload status may cause

deterioration or damage to internal parts.

Overdischarge Protection Function

When the battery connecting terminal voltage drops down to about

18.5 V, backup operation is automatically stopped to protect the

battery against overdischarge.

Note: 1. The standby current of the S8T-DCBU-01 will cause overdischarge to

continue ev en after bac kup operation has stopped. Do not leave the S8T-

DCBU-01 for extended periods in this condition. (Refer to Battery

Overdischarge on page 4.)

2. The residual capacity of the battery is zero when the battery voltage is

18.5 V (typical).

Backup ON/OFF Input Function

If the backup ON/OFF input terminals are short-circuited, backup is

enabled, while if the terminals are open, backup is disabled. The

terminal is non-v oltage input type and the short and open circuits are

specified below.

With the shipment setting, a short bar is installed to short-circuit

across the backup ON/OFF input terminals.

When the backup ON/OFF input terminals are open, the following

signs inform that backup is disabled.

•LED (Battery status indicator/BAT LOW: Red) is lit.

•Relay (Battery status output/BAT LOW) is in the LOW mode ((4)-

(5): ON).

Note: The standby current of the S8T-DCBU-01 will cause

overdischarge to continue even after backup operation has

stopped. Do not leav e the S8T-DCBU-01 for extended periods

in this condition. (Refer to Battery Overdischarge on page 4.)

Incorrect Battery Connection

Protection

When the DC Backup Block is turned ON, the charging circuit is

separated if battery connection terminal voltage becomes below

about 15.5 V. This function prot ects the battery and the main body

upon incorrect connection of the batteries (with reverse polarity or

with only one 12 V battery).

If an incorrect battery connection is detected, notification will be

provided the following ways.

•LED (Battery status indicator/BAT LOW: Red) is lit.

•Relay (Battery status output/BAT LOW) is in the LOW mode ((4)-

(5): ON).

Note: (1)After the battery has been properly connecte d, the battery status display an d output

will not respond even if the battery is disconnected (Battery Holder switch set to

OFF, Battery Holder fuse blown, ba ttery connection wiring disconnected) with the

AC power turned ON.

(2)Do not replace the battery while power is being supplied. If the battery is replaced

while power is being supplied, the incorrect battery connection protection will not

operate even if the battery is connected with the polarity reversed. The S8T-DCBU-

01 will be damaged and the Ba ttery Holder fuse will blow.

Battery Status Indication and Battery

Status Output

Notification of a battery charging/discharging fault (1. through 4.

described below) is provided in the following way.

If power failure occurs in this state, backup operation does not start

or the backup time becomes shorter. Remove the cause of the fault

immediately.

1. The battery connection terminal voltage is approx. 22.5 V or

lower. (BAT LOW will be cleared when the voltage reaches or

exceeds approx. 24.5 V.) (See note 1.)

2. The incorrect battery connection protection detected an incorrect

connection.

3. The battery ON/OFF input terminals are open.

4. An overload status exists during normal operation.

Note: 1. BAT LOW being cleared does not mean that battery charging has been

completed.

2. The contact capacity of the relay is 24 VDC 0.1 A.

Overload protection

operating point selector

Enlarged View of

Section A

Short Impedance: 1 kΩ or below

Flowing current at 0 Ω: About 2 mA

Residual voltage: 1 V or below

Open Impedance: 400 kΩ or more

COM

LOW

LED lit

(BAT LOW: Red) Relay (BAT LOW)

(4)-(5): ON

Battery status

output relay

Indicator

S8T-DCBU-01

■Battery Replacement

Sealed lead-acid batteries have a limited service life.

Fire may be caused in the worst case if the batteries are used

beyond their time for replacement. Replace batteries periodically to

avoid the worst case by referring to the following replacement proce-

dure.

Note: 1. Battery deterioration accelerates when its service life limit draws near.

2. The battery replacement timing assumes the battery has reached half its

original capacity.

3. The life v aries according to the storage and operating environment, output

wattage, and the frequency of backup operation.

4. Follow procedures specified by voluntary or regulatory regulations when

disposing of or recycling batteries.

5. Do not replace the battery while power is being supplied. If the battery is

replaced while power is being supplied, the incorrect battery connection

protection will not operate ev en if the battery is connected with the polarity

rev ersed. The S8T -DCB U-01 will be damaged and the Battery Holder fuse

will blow.

1. Replacement Guideline

Replace the battery using the following table as a guideline:

Note: The conditions in the table above is estimated as: charged at

27.4 V, discharged with 8 A (for LC-@123R4@@), 3.7 A (LC-

@122R2@@), backup operation once a month bases.

2. Measuring Backup Time

The backup time can be measured by the procedure below. If the

battery is new, first measure the initial backup time value.

Replace the battery if backup operation is not performed for the

required backup time during periodic maintenance or the backup

time has fallen below the half or less of initial value.

Note: 1. Make sure that at least 48 hours hav e elapsed since the pre vious bac kup

operation, and that the battery is correctly connected, and then measure

the backup time.

2. Measure the backup time after making sure that no problems will occur as

a result of stopping the power supply.

(1) Turn the AC power OFF and back up the S8T-DCBU-01.

(2) Measure the time that the battery status output relay turns to

LOW ((4)-(5): ON) after the operation mode output relay is

backed up ((1)-(2): ON). (This is the backup time.)

(3) When the battery status output relay turns LOW ((4)-(5): ON),

turn the AC power ON.

Periodic Inspection of the Battery

We recommend periodically inspecting the battery as follows:

•Check the battery voltage. (In a 27.4 V series connection, make

sure that each battery is charged to 13.7 V.)

•Check battery wiring and connections. (Check the batteries and

S8T-DCBU-01 connections for loose screws.)

•Make sure that backup operation is performed normally in a

simulated power failure state.

Note: Check the backup operation after making sure that no

problems will occur as a result of stopping the power supply.

Battery Ambient

temperature Life of battery Approximate

replacement

interval

LC-R122R2@@

LC-R123R4@@ 20 •C 2 to 3 years 2 years

30 •C 1 to 1.5 years 1 years

40 •C 0.5 to 0.75 years 0.5 year

LC-P122R2@@

LC-P123R4@@ 20 •C 4 to 6 years 4 years

30 •C 2 to 3 years 2 years

40 •C 1 to 2 years 1 year

Backup time

22.5 V (typical)

AC input

Output voltage of the

S8TS-06024@

Output voltage of the

S8T-DCBU-01

Battery connection

terminal voltage

Backup

((1)-(2))

Operation

mode outputNormal

((3)-(2))

LOW

((4)-(5))

Battery

status outputOK

((6)-(5))

S8T-DCBU-01

Installation

DC Backup Block

S8T-DCBU-01

Bus Line Connector

S8T-BUS03

(1) Selector

(2) Ground Terminal

(3) NC

(4) DC Bus Line Connector Terminal (+)

(5) DC Bus Line Connector Terminal (−)

Battery Holder

S82Y-TS01

(1) Battery Tray

(2) Fuse

(3) Terminal Block

(4) Switch

(5) Battery A (Order separately)

(6) Battery B (Order separately)

(7) Protection Cover

23 24

14 15

1917

1312

Operation mode output

(OPN MODE)

Battery status output

(BAT LOW)

Backup ON/OFF input

(ON/OFF)

COM

Normal

Backup

COM

LOW

(1) Backup: Operation mode output relay

(2) COM: Operation mode output relay

(3) Normal: Operation mode output relay

(4) LOW: Battery status output relay

(5) COM: Battery status output relay

(6) OK: Battery status output relay

(7) ON/OFF: Backup ON/OFF input

(8) GND: Backup ON/OFF input

(9) Output indicator (DC ON: Green)

(10) Backup status indicator (BUCKUP: Red)

(11) Battery status indicator (BAT LOW: Red)

(12) Battery connector terminal (−)

(13) NC

(14) Battery connector terminal (+)

(15) Slide r

(16) Short bar

(17) DC output terminal (−V)

(18) NC

(19) DC output terminal (+V)

(20) Rail stopper

(21) Bus line connector

(22) Terminal block cover

(23) Charging voltage selector

(24) Overload protection function selector

S8T-DCBU-01

Engineering Data

■Derating Curve

Note: 1. “(+1)” indicates redundant operation.

2. If there is derating problem, use forced air cooling.

3. The ambient temperature is specified at a location 50 mm downward from the main body of the DC Backup Block.

4. The ambient operating temperature range of the battery is 0 to 40•C; it is different from that of S8T-DCBU-01.

And the ambient temperature of battery is specified with the temperature at the battery surface.

5. The amount of output wattage at multi-connected S8TS-06024@ become smaller than the simple sum of each wattage, since S8T-DCBU-

01 consumes energy from S8TS-06024@.

Number of S8TS-06024@ units S8TS-06024@ rated input Derating curve Rated output power

1 200 to 240 VAC *1 36 W

100 to 120 VAC *2

1 (+1) 100 to 120 VAC/200 to 240 VAC *3 30 W

2 *4 88.8 W

2 (+1) *5 76.8 W

3 *6 146.4 W

3 (+1) *7 128.4 W

4 *8 192 W

4 (+1) *9 168 W

−20 −100 102030405060

S8T-DCBU-01

100

−20 −100 102030405060

88.8

76.8

160

140

120

100

−20 −100 102030405060

146.4

128.4

S8T-DCBU-01 S8T-DCBU-01

200

150

100

−20 −100 102030405060

192

168

S8T-DCBU-01

Output power (W)

Ambient temperature (°C)

Output power (W)

Ambient temperature (°C)

Output power (W)

Ambient temperature (°C)

Output power (W)

Ambient temperature (°C)

S8T-DCBU-01

■Time Charts

Startup

Note: Backup operation is not possible during the period (7 seconds (typical)) that the bat-

tery status output relay is LOW after the S8T-DCBU-01 is started up.

Power Failure (When the Battery

Voltage does not Reach the BAT LOW

Voltage)

Note: Backup op er atio n is con tinue d for seve n secon ds (typi cal) af ter th e po w er is restore d

from a power failure.

Power Failure (When the Battery

Voltage Reaches the BAT LOW Voltage)

Note: 1. When the battery voltage falls below 22.5 V (typical), the status of the

battery status output relay changes to LOW.

2. Backup operation is continued f or sev en seconds (typical) after the power

is restored from a power failure.

Power Failure (When the Battery

Voltage Reaches the Overdischarge

Protection Voltage)

Note: When the battery voltage falls below 22.5 V (typical), the status of the battery status

output relay changes to LOW. Ba ckup operation is stopped when the battery voltage

falls below 18.5 V (typical). If the battery is left with backup operation stopped, the

standby current of the S8T-DCBU-01 may cause the battery to continue discharging,

considerab ly r educe the service lif e of the ba ttery, and ren der rechar ging and bac kup

impossible. To prevent this, refer to Battery Overdischarge on page 4.

■Backup Time (Reference Value)

AC input

Output voltage of the

S8TS-06024@

Output voltage of the

S8T-DCBU-01

Battery connection

terminal voltage

Backup

((1)-(2))

Operation

mode outputNormal

((3)-(2))

LOW

((4)-(5))

Battery

status output7 seconds (typical) (See note.)

((6)-(5))

Power failure time

7 seconds (typical)

(See note.)

AC input

Output voltage of the

S8TS-06024@

Output voltage of the

S8T-DCBU-01

Battery connection

terminal voltage

Backup

((1)-(2))

Operation

mode outputNormal

((3)-(2))

LOW

((4)-(5))

Battery

status outputOK

((6)-(5))

Power failure time

7 seconds (typical) (See note 2.)

22.5 V (typical) (See note 1.)

AC input

Output voltage of the

S8TS-06024@

Output voltage of the

S8T-DCBU-01

Battery connection

terminal voltage

Backup

((1)-(2))

Operation

mode outputNormal

((3)-(2))

LOW

((4)-(5))

Battery

status outputOK

((6)-(5))

22.5 V (typical) (See note.) 18.5 V (typical) (See note.)

AC input

Output voltage of the

S8TS-06024@

Output voltage of the

S8T-DCBU-01

Battery connection

terminal voltage

Backup

((1)-(2))

Operation

mode outputNormal

((3)-(2))

LOW

((4)-(5))

Battery

status outputOK

((6)-(5))

00255075100

00 50 100 150 200

Backup time (min)

Output capacity (W)

Backup Time when

LC-@122R2@@ is Used Backup Time when

LC-@123R4@@ is Used

Backup time (min)

Output capacity (W)

Note: 1. Backup time conditions

•Backup time: Time from start of backup

until output voltage reaches 21.0 V.

•Ambient temperature: 25°C

•Battery: New product fully charged to

27.4 V

•Length of wire between

S8T-DCBU-01 and battery: 1.5 m

2. The backup time changes depending on

the capacity of connected equipment,

ambient temperature, and battery service

life.

S8T-DCBU-01

Dimensions

Note: All units are in millimeters unless otherwise indicated.

DC Backup Block

Bus Line Connector

Battery Holder

26.2V-27.4V CHARGE V

9.5A-4.4A OCP

120

543

2.5

80.7 35

120

5.6

(Sliding: 15 max.)

Six, M4

with square washer

130 max.

S8T-DCBU-01

28.6

24 7.6

1842.5

5.5

Sliding

5.5

Sliding

S8T-BUS03

52.75

212

222.25

114

185.7

Two,

8 dia.

S82Y-TS01

S8T-DCBU-01

■DIN Rail (Order Separately)

Note: All units are in millimeters unless otherwise indicated.

Mounting Rail (Material: Aluminum)

End Plate

4.5

15 25 25

10 10

1,000 (500) * 25 25 15(5) *

35±0.3

7.3±0.15

27±0.15

* Values in parentheses

are for the PFP-50N.

PFP-100N

PFP-50N

4.5

15 25 25

10 10

1,000 25 25 15 1 1.5

29.2242735±0.3

PFP-100N2

11.5

10 4.8

1.3

1.8

10 6.2 1.8

35.5 35.3

M4 spring

washer

M4 × 8

pan-head screw

PFP-M

S8T-DCBU-01

Safety Precautions

Refer to Safety Precautions for All Power Supplies.

!WARNING

Application

!CAUTION

Application

Battery Overdischarge

Installation and Environment

Operation

Maintenance

Do not use the Product in applications in which there is a

possibility of loss of life or bodily harm, such as with

medical devices, or other devices that may significantly

affect the public or society.

This Product is intended for short-term backup in

applications for which AC power is constantly supplied.

Follow the procedure described in Battery Overdischarge

on page 4 if the AC power is turned OFF or the power

failure lasts for a number of hours. The service life of the

battery will be considerably reduced, which may render

recharging and backup impossible.

Follow the procedure described in Battery Overdischarge

on page 4 to prevent battery overdischarge. If the battery

is overdischarged, service life of the battery will be

considerably reduced, which may render recharging and

backup impossible.

The battery may generate flammable gases when it is

charged, so that fire or explosion may be caused. Do not

use the battery in a tight area or near an object that

generates sparks, such as contactors, relays, or static

charge.

Loose screws ma y cause fire. Tighten the terminal screws

with torque of 1.08 N·m and tighten the connector screw

and threaded flange with torque 0.20 N·m.

Loose screws may result in fire. The tightening torque for

terminal screws on the Battery Holder is 0.74 N·m.

Electric shock may be caused. Do not remove any

connector covers from a connector unless using Bus line

connectors.

When connecting the Basic Block and DC Backup Block,

lock the slider and rail stopper. If they are locked

insufficiently, linkage may be disconnected due to

vibration, causing electric shock.

Insufficient charge, overdischarge, or faulty operation of

ov erload protection during backup operation s witching will

considerably reduce the service life of the battery, which

may render backup impossible. Do not connect a load or

capacitor between the S8T-DCBU-01 and the battery.

If a battery other than the designated ones is used, ignition

and fire may be caused. Do not use batteries other than the

designated ones.

Cracks will generate in the battery to cause leakage of

electrolyte. Do not apply resin including a migrational

plasticizer on the battery.

A short circuit may cause heat or spark, possibly causing

a damage to battery, fire or explosion.

When using metallic tools to install the battery to the

Battery Holder , use one insulated with vinyl tape or the like.

Wrong connection may cause smoke or fire. Connect the

battery correctly.

Install and ship the Battery Holder in the specified

direction. Installing or shipping the Battery Holder in a non-

specified direction may cause the battery fluid to leak.

Protection against battery liquid leaking will not be

possible, and the battery may produce smoke or may

ignite.

The battery may deteriorate quickly and cause fire.

(Operating temperature range of a battery: 0 to 40°C)

Do not operate the battery in an area exceeding 40°C.

Do not use the Product in locations subject to corrosive gases.

If the Product is used or left in atmospheres with corrosiv e

gas, the corroded contact surfaces of the switches or relays

ma y cause contact instability or contact failure and render

battery recharging or backup operation impossible. In the

worst case, corrosive gas entering the battery may cause fire.

Smoke and fire may be caused. Do not use new and old,

different types, and different residual capacities of

batteries mixed.

Internal parts may be deteriorated or damaged if the Product

is used for applications with frequent inrush current at the load

end. Do not use the Product fo r such applications.

A battery could be dangerous if it is used incorrectly.

Follow the precautions of a battery when using.

Minor burns may occur due to high temperatures. Do not

touch the Product while power is being supplied or

immediately after power is turned OFF.

Electric shock ma y be caused. Do not add or separate the

DC Backup Block during power-on.

If the equipment must be stopped in an emergency, turn

OFF the AC power and disconnect the battery. If only the

AC power is turned OFF, power will be supplied from the

battery and the connected equipment will continue to

operate. This ma y result in damage to equipment or injury.

Fire may be caused if the fully drained battery is kept in

use. Replace the battery immediately if it is fully drained.

If malodor, abnormal noise, smoke, or fluid is issued from

the battery, turn off the switch of the Battery Holder.

Continuation of operation in this state may cause fire.

Battery fluid may cause loss of sight or burn injuries. Do not

touch any fluid leaking from the battery. If the fluid comes into

contact with your eyes or skin, immediately flush the area

thoroughly with clean water and get medical attention.

Shocks or vibrations may cause battery performance to

deteriorate. Do not use the Battery Holder in locations

subject to shocks or vibrations.

Electric shock may be caused. Do not disassemble the

Product or touch internal parts during power-on.

When performing maintenance, disconnect the battery

before turning OFF the AC power. (Refer to Battery

Overdischarge on page 4.) If only the AC power is turned

OFF, power will be supplied from the battery and the

connected equipment will continue to operate.

A dropping battery may cause injuries and burns caused

by leaking electrolyte. Do not drop the battery during

installation of the battery or Battery Holder or replacement

of the battery.

S8T-DCBU-01

■Precautions for Safe Use

Mounting

Ensure sufficient heat dissipation when installing the S8T-DCBU-01

to increase its long-term reliability. Natural cooling is used for the

S8T-DCBU-01, so mount it so that there is airflow around it.

When cutting out holes for mounting, make sure that cuttings do not

enter the interior of the products.

Be sure to remove the sheet covering the Power Supply for

machining before turning ON the power so that it does not interfere

with heat dissipation.

Connect the S8T-DCBU-01 to the right or left end of S8TS-06024@

Basic Blocks.

Wiring

During installation, make sure that the discharge voltage selector

and the overload protection function se lector are set correctly.

Minor fire may occur. Ensure that input and output terminals are

wired correctly.

Connect the ground completely. Electric shock or malfunction may

occur if the ground is not connected completely.

Do not apply more than 100-N force to the terminal block and

connector terminal when tightening it.

Close the terminal cover to avoid short circuit of terminals with a

foreign object.

Use the following material to wire to load and to the batteries for

preventing wiring material from smoke or fire caused by the

abnormal load.

Recommended Wire Diameter

Installation Environment

Do not use the Product in locations subject to shocks or vibrations. In

particular , install the Product as f ar away as possible from contactors

or other devices that are a vibration source. Be sure to mount End

Plates (PFP-M) on both ends of the S8T-DCBU-01.

Install the S8T-DCBU-01 well away from any sources of strong, high-

frequency noise and surge.

Ambient Operating and Storage

Environment

Do not use or store the Product in the following locations. Doing so

may result in product failure, incorrect operation, or deterioration.

•Usage in locations subject to direct sunlight

•Usage in locations with an ambient temperature outside the derat-

ing curve range

•Usage in locations with relative humidity outside 25% to 85% or

condensation from rapid temperature change

•Storage in locations with a ambient temperature outside −25 to

65°C or relative humidity outside 25% to 90%

•Usage in locations where liquid, foreign matter, corrosive gas, or

combustible gas may enter the product

•Follow the battery instructions regarding using the Battery Holder

with the battery mounted and the storage environment.

When storing the battery f or an e xtended period of time, observe the

following two precautions.

•Turn OFF the battery switch. The standby current of the S8T-

DCBU-01 will cause discharging to continue.

•Charge the battery at interv als specified by the manuf acturer of the

battery. Self-discharging during storage will cause battery to

continue discharging.

Handling of Bus Line Connector

Do not drop or give strong impact on the Bus line connector.

DIN Rail Mounting

To mount t he Block on a DIN rail, hook por tion (A) of the Block onto

the rail and press the Block in direction (B).

To dismount the Block, pull down portion (C) with a flat-blade screw-

driver and pull out the Block.

Sparks generated when the battery is connected may

cause explosion or fire. Do not install or replace the battery

in the presence of flammable gases.

Diluted sulfuric acid may leak, possibly causing loss of

sight or burns. Do not disassemble or remodel the battery.

Electric shock, fire or burns may be caused. Do not short-

circuit the battery using a metallic matter.

Explosion may be caused if a battery is thrown in fire.

Observe self-imposed controls, laws and regulations for

disposal or collection (recycle) of a battery.

*1*1

*1 *1

S8TS-06024@S8TS-06024@

S8T

-DCBU-01

*1. Convection of air *3. 75 mm min.

*2. 75 mm min. *4. 10 mm min.

S8T-DCBU-01S8T-DCBU-01S8T-DCBU-01

S8TS-

06024@S8TS-

06024@S8T-

DCBU-

S8T-

DCBU-

S8T-

DCBU-

S8TS-

06024@

S8TS-

06024@

S8TS-

06024@

S8TS-

06024@

Correct Correct Incorrect

Overload protection

operating point selector Number of connected

S8TS-06024@Recommended wire

diameter

5.7 A (typical) 1, 2 AWG 14 to 18

(cross-sectional area:

0.823 to 2.081 mm2)

3 AWG 14 to 16

(cross-sectional area:

1.309 to 2.081 mm2)

11.7 A (typica l) 3, 4, 5 AW G 14

(cross-sectional area:

2.081 mm2)

(B)

(A)

Rail stopper

S8T-DCBU-01

Troubleshooting

This page lists the errors that may occur when the S8T-DCBU-01 is used, along with their probable causes and remedies.

Check the relevant item.

When Probable cause Description Remedies

Installation S8T-DCBU-01 cannot be

connected. The Bus Line Connector is provided with a

selector for preventing misconnection of 5 V

and 12 V specification of S8TS units. For this

reason, connection is not successful if different

specification units are installed.

Set the selector on the Bus Line Connector

(provided) to 24 V.

Refer to S8T-BUS03 on page 7 for details.

When checking

the perfo rmances

Refer to

Operation Check

on page 7 for

details.

The S8T-DCBU-01 output

indicator does not light in

operation check procedure ,

step 2.

The S8T-DCBU-01 operates by the output of

the S8TS-06024@. A probable cause is that the

Bus Line Connector is not connected as the

input voltage is connected by the Bus Line

Connector (provided).

Connect the S8T-DCBU-01 to S8TS-06024@

using the Bus Line Connector (provided).

Refer to Basic Configuration on page 2 for

details.

The connected S8TS-

06024@ does not operate in

operation check procedure ,

step 2.

A probable cause is that the S8T-DCBU-01 is

connected between S8TS-06024@ Basic

Blocks.

The S8T-BUS03 Bus Line Connector for

connecting the S8T-DCBU-01 is not connected

to the AC power line. Connect the S8T-DCBU-

01 to the left or right end of S8TS-06024@ Basic

Blocks.

The battery status indicator

is lit even 10 seconds or

more after the power is

turned ON in operation

check procedure, step 3.

A probable cause is that the battery was

connected with the + and − polarities reversed. Connect the battery correctly.

Refer to Incorrect Battery Connection

Protection on page 8 for details.

A probable cause is that the battery voltage falls

below about 22.5 V. (Battery self-discharging or

the standby current of the S8T-DCBU-01 may

have caused discharging to continue.)

Check the battery connection terminal voltage.

If it is 18.5 V or lower, replace the battery.

Subsequently, follow the procedure described

in Battery Overdischarge on page 4.

A probable cause is that the backup ON/OFF

input is open. Short the backup ON/OFF input. (At shipment,

the backup ON/OFF input is shorted.)

Refer to Backup ON/OFF Input Function on

page 8 for details.

A probable cause is that the overload protection

has been triggered in the connected S8TS-

06024@.

As energy is consumed by S8T-DCBU-01, the

total output capacity of the number of

connected S8TS-06024@s cannot be obtained.

Connect one more S8TS-06024@ Basic Bloc k.

Refer to the Derating Curve on page 11 for

details.

A probable cause is that the overload protection

function selector switch on the S8T-DCB U-01 is

set low.

When three or more S8TS-06024@ Basic

Blocks are connected, set the overload

protection function selector to 11.7 A (typical).

(The default setting is 5.7 A (typical).)

Refer to Overload Protection Operating Point

Selector on page 8 for details.

A probable cause is that the output voltage

adjuster (V. ADJ) of the connected S8TS-

06024@ is set lower than the factory-set

voltage.

The S8T-DCBU-01 detects drops in the output

voltage of the S8TS-06024@ and s witches over

to backup operation. Adjust the output voltage

adjuster (V. ADJ) on the S8TS-06024@ so that

the output in a no-load state is 24.5 V or more.

Refer to Output Voltage Adjustment for S8TS-

06024

on page 6 for details.

The backup operation is not

performed in operation

check procedure, step 5.

A probable cause is that inrush current during

backup operation caused the fuse on the

battery to blow.

Select a fuse taking the inrush current when

backup operation is switched to into

consideration. The recommended S82Y-TS01

Battery Holder is selected taking this inrush

current into consideration.

Refer to Battery Holder S82Y-TS01 on page 6

for details.

When S8T-DCBU-

01 is used The backup state is not

returned to normal even

after the power is restored

from a power failure.

A probable cause is that a protection function

on the S8TS-06024@ was activated to stop

S8TS-06024@ operation.

Cancel the protection functions on the S8TS-

06024@. (T urn OFF the power of S8TS-06024@

Basic Block, and after at least one minute turn

ON the input voltage again.)

Output was cut during

backup operation. A probable cause is that the overdischarge

protection function was activated by a battery

voltage dropping due to discharge.

If a remedy is required during backup operation,

allow backup to finish until the battery status

indicator is lit.

A probable cause is that an overload state is

reached due to load fluctuations during backup

operation.

Provide sufficient margin for the load capacity

when using the S8T-DCBU-01.

Backup operation and

normal operation are

alternately repeated.

A probable cause is that one of the S8TS-

06024@s is out of order when two or more

S8TS-06024@s are connected.

Replace the out-of-order S8TS-06024@.

Refer to Bac kup Function on page 6 f or details.

A probable cause is that the S8TS-06024@ is in

an overload state due to load fluctuations

during normal operation.

Provide sufficient margin for the load capacity

when using the S8T-DCBU-01.

The battery status indicator

remains lit when a period of

24 hours has passed after

power has been applied.

A probable cause is that discharging continued

while the AC was turned OFF because of

battery self-discharging or standby current of

the S8T-DCBU-01.

Replace the battery.

Subsequently, follow the procedure described

in Battery Overdischarge on page 4.

S8T-DCBU-01

When inspecting

batteries Backup time is too short. A probable cause is that backup operation was

performed frequently (e.g., turning OFF the AC

power at night or on days off).

Replace the battery.

Subsequently, follow the procedure described

in Battery Overdischarge on page 4.

A probable cause is that the battery has

reached the end of its service life. We recommend periodically replacing the

battery.

Refer to Battery Replacement on page 9 for

details.

A probable cause is that the S8T-DCB U-01 was

stored for a long time with the battery

connected.

Replace the battery.

Subsequently, follow the procedure described

in Battery Overdischarge on page 4.

A probable cause is that battery characteristics

caused the backup time to shorten in low

temperatures.

Check the backup time in the operating

environment before use.

The voltages of the two

batteries used in series are

considerably different.

A probable cause is a battery abnormality. Replace both batteries.

When Probable cause Description Remedies

In the interest of product improvement, specifications are subject to change without notice.

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

To convert millimet ers into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

Terms and Conditions Agreement

Read and understand this catalog.

Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you

have any questions or comments.

Warranties.

(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship

for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron

disclaims all other warranties, express or implied.

(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT

NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER

ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE

PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.

Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the

Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at

Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or

replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount

equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,

repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products

were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate

modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall

not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or

electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,

recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above

warranty.

See http://www.omron.com/global/ or contact your Omron representative for published information.

Limitation on Liability; Etc.

OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,

LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,

WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.

Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.

Suitability of Use.

Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the

combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable

third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself

is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,

system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product

with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.

NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE

QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,

AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE

OVERALL EQUIPMENT OR SYSTEM.

Programmable Products.

Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence

thereof.

Performance Data.

Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining

suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate

it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.

Change in Specifications.

Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our

practice to change part numbers when published ratings or features are changed, or when significant construction changes are

made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers

may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at

any time to confirm actual specifications of purchased Product.

Errors and Omissions.

Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is

assumed for clerical, typographical or proofreading errors or omissions.

2013.11

In the interest of product improvement, specifications are subject to change without notice.

OMRON Corporation

Industrial Automation Company

http://www.ia.omron.com/

Mouser Electronics

Authorized Distributor

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S8T-DCBU-01