CSM_S8T-DCBU-01_DS_E_7_1
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
2
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
DC
Backup
Block
DC
Backup
Block 24-VDC output
Monitor Monitor
100 to 240 VAC 100 to 240 VAC
Charge Discharge
24 V
24 V
2.5 A 24 V
2.5 A
Improve system reliability by
using DC Backup Blocks.
3
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-
01
S8TS-
06024
LN
+V
-V+V
-V
(Fig. 1)
S8T-DCBU-01
4
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.
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
−V
X
X
Charging
circuit
Input
voltage
detection
Detection resistorDischarge circuit
Battery misconnection
protection circuit
Bypass D
Fuse
2.0 A
Discharge
control
circuit
Battery
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
5
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
X
X
S82Y-TS01 (Battery Holder)
S8T-DCBU-01
LOAD
LN+−
+V−V
−V
+V
X1
3
5
78
6
4
2
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
LN
S8TS-06024@
LOAD
+V−V
X
−V
+V
+−
X
SW (See note 6.)
Specified relay (X): OMRON LY1-D (24 VDC)
(See note 5 on page 5.)
S8T-DCBU-01
6
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
1
2
3
COM
Normal
Backup
LED lit
(DC ON: Green)
LED lit
(BACKUP: Red)
Relay (OPN MODE)
(1)-(2): ON
Operation mode
output relay
Indicator
45
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)
45
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)
7
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
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%
4
5
6
1
2
3
COM
OK
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
4
5
6
1
2
3
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
OK
Terminal
block cover
Overcurrent protection
operating point selector
Section A
Charging voltage selector
Charging voltage selector
Enlarged View of
Section A
S8T-DCBU-01
8
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
4
5
6
COM
OK
LOW
LED lit
(BAT LOW: Red) Relay (BAT LOW)
(4)-(5): ON
Battery status
output relay
Indicator
9
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
10
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
1
2
3
4
5
6
2
1
3
4
5
6
7
8
9
10
11
22
23 24
20
21
14 15
15
1917
18
1312
16
Operation mode output
(OPN MODE)
Battery status output
(BAT LOW)
Backup ON/OFF input
(ON/OFF)
COM
Normal
Backup
COM
OK
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
1
2
3
4
5
42
15
6
3
7
11
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
40
35
30
25
20
15
10
5
0
−20 −100 102030405060
*2
*3
*1
36
S8T-DCBU-01
100
80
60
40
20
0
−20 −100 102030405060
*4
*5
88.8
76.8
160
140
120
100
80
60
40
20
0
−20 −100 102030405060
*6
*7
146.4
128.4
S8T-DCBU-01 S8T-DCBU-01
200
150
100
50
0
−20 −100 102030405060
*8
*9
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
12
■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.)
OK
((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))
80
70
60
50
40
30
20
10
00255075100
80
70
60
50
40
30
20
10
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.
13
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
10
80.7 35
120
10
4
5.6
(Sliding: 15 max.)
Six, M4
with square washer
130 max.
S8T-DCBU-01
28.6
24 7.6
1842.5
13
5
2
35
70
10
5.5
Sliding
5.5
Sliding
S8T-BUS03
52.75
212
222.25
114
8
185.7
82
Two,
8 dia.
S82Y-TS01
S8T-DCBU-01
14
■DIN Rail (Order Separately)
Note: All units are in millimeters unless otherwise indicated.
Mounting Rail (Material: Aluminum)
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
1
* 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
16
PFP-100N2
50
11.5
10 4.8
1.3
1.8
1
10 6.2 1.8
35.5 35.3
M4 spring
washer
M4 × 8
pan-head screw
PFP-M
15
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
16
■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
*2
S8TS-06024@S8TS-06024@
*3
*4
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-
01
S8T-
DCBU-
01
S8T-
DCBU-
01
LN
S8TS-
06024@
LN
S8TS-
06024@
LN
S8TS-
06024@
LN
S8TS-
06024@
LN
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)
(C) 30 mm min.
Rail stopper
17
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
18
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.
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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/
(c)Copyright OMRON Corporation 2013 All Right Reserved.
Mouser Electronics
Authorized Distributor
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S82Y-TS01