Operation Check; Overvoltage Protection Circuit - Omron S8T-DCBU-01 Manual

Operation Check

After connecting S8TS-06024@ and S8T-DCBU-01, it is recom-
mended to check the DC Backup Block if it is correctly operating in
the following procedure.
1. Turn ON the Battery Holder.
2. Turn ON the AC power to the S8TS-06024@.
3. Wait for 10 sec. or more then check if the DC Backup block is in
Status 1.
Indicator Operation mode
output relay
Backup
COM
Normal
LED lit Relay (OPN MODE)
(DC ON: Green) (3)-(2): ON
Functions
Charge voltage selector
Terminal
block cover
Charging Voltage Selector
Select either 27.4 V or 26.2 V at the charging
voltage selector to select the charging volt-
age.
Because the battery manufacturer recom-
mends 27.4 V as charging voltage, it is rec-
ommended to charge at 27.4 V.
In this case, 27.4 VDC, which is the charging
voltage of the batteries, may output depend-
ing on the state of connected load when the
operation changes to Backup.
Note: If the battery is charged at 26.2 V, the battery capacity decreas-
es each time the battery is charged, and the backup time grad-
ually decreases.
Capacity reduction in each charge-and-discharge cycle
At 25°C Reduction by 10%
At 0°C Reduction by 20%
Battery status
output relay
LOW
1 4
COM
2 5
OK
3 6
Relay (BAT LOW)
(6)-(5): ON
Overcurrent protection
function selector
Section A
Enlarged View of
Section A
Charge voltage selector
(Reference value)
4. Turn OFF the AC power of the S8TS-06024@.
5. Confirm that Backup operation is correctly performed in Status 2.
Indicator Operation mode
output relay
LED lit Relay (OPN MODE)
(DC ON: Green) (1)-(2): ON
LED lit
(BACKUP: Red)
6. Turn ON the AC power of the S8TS-06024@.
Note: 1. Perform operation checks 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.

Overvoltage Protection Circuit

If the charge voltage is about 30 V or above, the charge voltage is
cut off to prevent the battery from being overcharged.
How to Reset Overvoltage Protection
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 switch.
2. Turn OFF the AC power of the S8TS-06024@.
3. Leave the power supply OFF for 1 minute or more.
4. Turn ON the Battery Holder switch.
5. Turn ON the AC power of the S8TS-06024@ again.
Note: 1. Remove the cause before turning on the AC power again.
2. As an AC input OFF status is the same as a power failure,
the S8T-DCBU-01 will perform backup operation. Some-
times charging cannot be performed for the required backup
time as the battery is not sufficiently charged. For this rea-
son, first make sure that backup operation is not needed be-
fore turning the battery holder switch and then the AC input
OFF.
3. The off time necessary for restoration assumes connection
of five units of S8TS-06024@, without a load, and fully
charged batteries.
Overcurrent Protection Operating Point
Selector
5.7 A (typ.) or 11.7 A (typ.) can be selected
with the selector as an overcurrent protection
operating point during backup operation.
Select 5.7 A (typ.) for one or two units of
S8TS-06024@ (or three units during N+1
redundancy operation), or select 11.7 A (typ.)
for three or four units (or five units during N+1
redundancy operation). The shipment set-
ting is 5.7 A (typ.).
DC Backup Block for S8TS
Battery status
output relay
Backup LOW
1
COM COM
2
Normal OK
3
Relay (BAT LOW)
(6)-(5): ON
Enlarged View of
Section A
Overcurrent protection
function selector
S8T-DCBU-01
4
5
6
7