S8T-BUS03 Omron, S8T-BUS03 Datasheet - Page 8

• Manufacturer Part Number: S8T-BUS03
• Description: CONNECTOR DC LINE BUS
• Manufacturer: Omron
• Series: S8TSr

Specifications of S8T-BUS03

• Accessory Type: Bus Line Connectors
• For Use With/related Products: S8TS Power Supplies
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: S8TBUS03

Overvoltage Protection Circuit
If the charging voltage is about 30 V or above, the charging 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.
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
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 four 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 failure occurs in this state, an overload 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
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
2. As an AC input OFF status is the same as a power failure, the S8T-DCBU-
3. The time required for reset is specified for connection of five units of
deterioration or damage to internal parts.
2. The residual capacity of the battery is zero when the battery voltage is
has been removed.
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.
S8TS-06024@, without a load, and fully charged batteries.
continue even after backup operation has stopped. Do not leave the S8T-
DCBU-01 for extended periods in this condition. (Refer to Battery
Overdischarge on page 4.)
18.5 V (typical).
Enlarged View of
Overload protection
operating point selector
Section A
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-voltage 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)-
Note: The standby current of the S8T-DCBU-01 will cause
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 protects 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)-
Note: (1) After the battery has been properly connected, the battery status display and output
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
2. The incorrect battery connection protection detected an incorrect
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
LED lit
(BAT LOW: Red)
Short
Open
Indicator
(5): ON).
(5): ON).
lower. (BAT LOW will be cleared when the voltage reaches or
exceeds approx. 24.5 V.) (See note 1.)
connection.
(2) Do not replace the battery while power is being supplied. If the battery is replaced
overdischarge to continue even after backup 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 contact capacity of the relay is 24 VDC 0.1 A.
will not respond even if the battery is disconnected (Battery Holder switch set to
OFF, Battery Holder fuse blown, battery connection wiring disconnected) with the
AC power turned ON.
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 Battery Holder fuse will blow.
completed.
Relay (BAT LOW)
(4)-(5): ON
Battery status
output relay
COM
LOW
OK
Impedance: 1 kΩ or below
Flowing current at 0 Ω: About 2 mA
Residual voltage: 1 V or below
Impedance: 400 kΩ or more
4
5
6
S8T-DCBU-01
8