S8T-DCBU-01 Omron, S8T-DCBU-01 Datasheet - Page 4

• Manufacturer Part Number: S8T-DCBU-01
• Description: DC BACKUP BLOCK 24V 3.7/8A
• Manufacturer: Omron
• Series: S8TSr

Specifications of S8T-DCBU-01

• Accessory Type: DC Backup Block
• For Use With/related Products: S8TS Power Supplies
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: S8TDCBU01

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 for details on how 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.)
2. Discharge Due to S8T-DCBU-01 Standby Current (See note 1.)
Connector for
Bus Line
Connector
S8T-DCBU-01
Using the discharge protection function, rapid discharge is
prevented by the battery connection terminal voltage
automatically stopping backup operation at approximately 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. Therefore, refer to item
2.
The AC power will turn OFF due to the standby current generated
in the circuit configuration, and discharge will continue even 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.)
(2) Open the backup ON/OFF input using an external signal and
Battery
ON/OFF
input
Connect the external circuit shown in Figure 1 to protect
against forgetting to change the switch. (See note 8.)
disconnect the battery using an external relay. (See Figure 1
and notes 2, 4, and 8.)
DC (+)
DC (−)
Input
voltage
detection
Fuse
2.0 A
Charging
circuit
Bypass D
Battery
voltage
detection
Overdis-
charge
detection
Table 1: Usage with Possible Overcharge Due to Standby
Note: 1. The standby current of the S8T-DCBU-01 will cause the battery to
Turning OFF the AC power
after assembly and
installation (See note 7.)
Turning OFF the AC power
during maintenance or
inspection
Fre-
quently
turning
the AC
power
OFF
Storage or shipment
Long-term power outage
Discharge circuit
Discharge
control
circuit
2. Before turning ON the AC power, turn OFF the Battery Holder switch or
Current
discharge after backup operation has stopped because of the discharge
protection function or the backup ON/OFF input is opened.
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 switch SW shown in
Figure 2 when turning ON the AC power.
Turning OFF the AC
power during lunch
breaks (1 hour/day)
Turning OFF the AC
power at night (16
hours/day)
Turning OFF the AC
power on Saturdays
and Sundays
Turning OFF the AC
power during long
vacations
Detection resistor
Overcurrent
detection
X
X
battery life due to
---
---
Possible
Possible
Possible
---
---
---
frequent backup
DC OUTPUT
BAT−
−V
shortening of
operations or
BAT+
+V
insufficient
Battery not disconnected
charging
Extreme
Battery
S8T-DCBU-01
Operation
mode
output
Battery
status
output
Connector for
Bus Line
Connector
Possible
Possible
---
---
Possible
Possible
Possible
Possible
due to battery
and inability
to recharge
overcharge
incapacity
Backup
4