8
4. Installation
2
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 its inverter and inhibits transfer to internal bypass. A cable is required
to connect the EPO port of the UPS (see
2a
) to a normally closed or normally open switch
according to the circuit diagram (see
2b
). The cable and switch must be supplied by the user.
Notes:
1. The cable should not have a resistance greater than 5 ohms.
2. 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 Unit State when asserting EPO with AC line present:
LEDs
Output
Fans
Serial
SNMP
USB
OFF
OFF
ON (if in
frequency
conversion
mode)
ON
ON
ON
To restart the UPS unit after asserting EPO with AC line present:
1. Verify the EPO assertion has been removed or cleared.
2. Press the ON button
3. Now the UPS will start back up in Bypass mode.
UPS Unit State when asserting EPO without AC line power:
LEDs
Output
Fans
Serial
SNMP
USB
OFF
OFF
OFF
OFF
OFF
OFF
To restart the UPS unit after asserting EPO without AC line power:
1. Verify the EPO assertion has been removed or cleared.
2. Reapply AC line power to the UPS unit. Now the UPS will start back up in Standby mode.
4-5
2a
2b
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