Operating Instructions
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3.6 Emergency Shutdown With EPO
This circuit has been designed to switch off the UPS in emergency conditions (i.e., fire, flood, etc.). The
system will turn off the rectifier, inverter and stop powering the load immediately (including the
inverter and bypass), and the battery stop charging or discharging.
3.7 Auto Restart
When main and bypass sources fail due to utility power failure, the system will operate on battery
continuously until shut down due to battery end of discharge (EOD).
When “Auto Recovery after EOD Enabling” is enabled, the UPS will enable output power after the
main or bypass source becomes normal, or after the user pushes the “Fault Reset” button. After the
time set in “Auto Recovery after EOD delay time” has expired and the rectifier is ready, the inverter
will be turned on automatically. The UPS will be in normal mode.
When “Auto Recovery after EOD Enabling” is disabled, the UPS will not turn back on—even if the
main or bypass source recovers—until the user pushes the “Fault Reset” button.
The default setting for “Auto Recovery after EOD Enabling” is disabled, and the default setting for
“Auto Recovery after EOD delay time” is 10 minutes.
3.8 Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions
Once all appropriate measures have been taken to correct the problem indicated by the alarm mes-
sage appearing on the operator control panel display, carry out this procedure to restore the UPS to
regular operation following an EPO action or for the following reasons: Inverter Over temperature,
Cut-off Overload, Battery Over voltage, excessive switching (BYP: XFER COUNT BLOCK), etc.
When the user confirms that the fault is cleared:
1. Press the FAULT CLEAR button to let the system exit the emergency off state.
2. Press the INVERTER ON button (10) on the right side of the operator control panel for longer
than 2 seconds.
NOTE
The rectifier will start again, the battery contactor will close and the bypass will begin to power
the load. The Rectifier indicator (1) flashes while the rectifier is starting up. When the rectifier
enters the normal operation state (about 30 seconds), the rectifier indicator turns green.
NOTE
The rectifier will be turned on automatically when the over temperature fault disappears at
5 minutes after the disappearance of overtemperature signals.
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