4-5
3a
3b
Your model may differ.
21
Optional Connections
3
EPO Port Connection
This optional feature is only for those applications that require connection to a facility’s Emergency Power Off (EPO) circuit. When the
UPS is connected to this circuit, it enables emergency shutdown of the UPS’s inverter and inhibits transfer to internal bypass.
Connect the EPO port of your UPS (see
3a
) to a user-supplied normally closed or normally open switch according to the circuit diagram
(see
3b
).
Note:
If a non-latching EPO switch is used, the EPO must be held for a minimum of 1 second. This does not apply to a latching EPO switch.
UPS state when asserting EPO with valid AC input present:
AC Output
LCD Screen Status
LEDs Status
Off
EPO Active
Only AC Input Indicator is On.
To restart the UPS after EPO assertion with valid AC input present:
1. Verify that the EPO assertion has been removed or cleared.
2. Press and hold the POWER ON/OFF button until it beeps. Now the UPS will start back up in one of the pre-configured normal
operating modes.
UPS state when asserting EPO without valid AC input present (Battery Mode):
AC Output
LCD Screen Status
LEDs Status
Off
EPO Active
Off
To restart the UPS after EPO assertion without valid AC input present:
1. Verify that the EPO assertion has been removed or cleared.
2. Wait until the LCD completely turns off.
3. Press and hold the POWER ON/OFF button until it beeps. Now the UPS will start back up to Battery Mode.
To restart the UPS after EPO assertion with valid AC input present:
1. Verify that the EPO assertion has been removed or cleared.
2. Wait until the LCD completely turns off.
3. Reapply AC input power, press and hold the POWER ON/OFF button until it beeps. Now the UPS will start back up in one of the
pre-configured normal operating modes.
Note:
If AC input power is reapplied before the LCD completely turns off, the UPS will automatically restart to one of the pre-configured normal operating line modes
without using the POWER ON/OFF button.
