Powerware 5075 kVA - Manual (Page 78)

70 Powerware BPIII Harsh Environment UPS 50--75 kV Installation and Operation
164291261 Rev. F 111503
Using the EMERGENCY POWER OFF Pushbutton
Emergency Power Off is initiated by the covered, red EMERGENCY POWER OFF
pushbutton on the Monitor Panel. This pushbutton is protected by a clear plastic
shield to prevent accidental activation. In an emergency, you can press this
pushbutton to instantaneously open the input breaker and interrupt UPS output.
The UPS is cut off from utility power, and your critical load is de-energized. All
power to the critical load is lost. The UPS (including Bypass) remains locked off
until you reset the EMERGENCY POWER OFF pushbutton.
WARNING:
All power to the critical load is lost when you press this pushbutton. You should
use this feature only in an emergency or when you want to de-energize the critical
load.
To restart the UPS after pressing the EMERGENCY POWER OFF pushbutton,
follow the procedure “Resetting UPS System after Emergency Power Off” of this
chapter before starting the UPS.
NOTE: The Remote EMERGENCY POWER OFF option functions the same way as
the EMERGENCY POWER OFF pushbutton on the Monitor Panel.
To Use the EMERGENCY POWER OFF Pushbutton
1. Raise the clear plastic shield covering the red EMERGENCY POWER OFF
pushbutton on the Monitor Panel.
2. Press the EMERGENCY POWER OFF pushbutton.
The breakers open (you can hear them opening). The breaker CB1 trips, and the
Emergency Power Off PUSH TO RESET pushbutton on the UPS Control Panel pops
out. The UPS system shuts down.
Resetting UPS System after Emergency Power Off
CAUTION:
Do not attempt to restart the system until the cause of the emergency has been
identified and cleared.
The Emergency Power Off PUSH TO RESET pushbutton is a small white button on
the UPS Control Panel. The PUSH TO RESET pushbutton pops out and the CB1
switch trips when the EMERGENCY POWER OFF pushbutton on the Monitor
Panel is activated.
To reset the UPS system:
1. Press the Emergency Power Off PUSH TO RESET pushbutton until it clicks in
and remains recessed.
2. Move the CB1 switch from the TRIPPED (center) position to OFF. The switch
should be difficult to move from the TRIPPED position.
3. The UPS system is now reset. To restart the UPS system, follow the procedure
at the beginning of this chapter.