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3.6 Emergency Shutdown Using EPO/REPO
CAUTION Pressing the “Emergency Power Off” (EPO) or “Remote Emergency Power Off”
(REPO) pushbutton disconnects the attached load. The EPO is to be used during
emergency situations only, where a hazard to personnel or equipment exists, such
as during a fire. DO NOT USE THE EPO TO TURN THE UPS ON OR OFF.
Follow the procedures listed in this section for turning the Inverter on and off.
During an emergency situation, such as a fire in the computer or electrical room, the UPS and all downstream
devices can be instantly shut down by pressing the EPO pushbutton on the front panel of the UPS cabinet, or
by pressing the "Remote Emergency Power Off" (REPO) optional pushbutton.
The EPO or REPO pushbuttons should not be used for normal shutdown of the equipment.
If the EPO pushbutton has been pressed, it must be reset by pressing it again and by pressing the "Fault Reset"
key on the front panel to allow the UPS to restart.
3.7 Forced Transfer
CAUTION Using the forced transfer functions will cause the load to experience a power
interruption for a minimum of 500 milliseconds. Be certain that the load can
tolerate this interruption.
Forced transfer is required if bypass input is out of tolerance. The load can be transferred from the Inverter
output to the bypass input source, or back, with a power interruption of 500 milliseconds.
Transferring the Load to Bypass Input From Inverter
On the front panel, press the "Security" key and hold it while pressing the gray "Inverter OFF" pushbutton for 3
seconds.
Transferring the Load to Inverter From Bypass Input
On the front panel, press the "Security" key and hold it while pressing the green "Inverter ON" pushbutton for 3
seconds.
3.8 Maintenance Bypass
This procedure assumes that the UPS is operating normally, with the attached load supplied via the Inverter.
3.8.1 From Normal Maintenance Bypass Mode
1. Stop the Inverter by pressing the gray "Inverter OFF" pushbutton on the UPS front panel for approximately three
(3) seconds. The audible alarm will sound; silence the alarm by pressing the "Buzzer Reset" pushbutton. If the
transfer conditions are not satisfied (bypass out of tolerance or other reason), a forced transfer will be required.
Refer to the "Forced Transfers" section for more information.
2. Switch the battery circuit breaker QF1 to the "OFF" position.
NOTE The battery circuit breaker QF1 will automatically trip open if left in the “ON”
position when the UPS is placed in the Maintenance Bypass mode.
3. Turn the manual bypass switch to the "TRANSFER" position, then to the "BYPASS" position.
4. All indicating LED's go off.
Comet 40-150kVA
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