SECTION III
Operation
Page 3.10
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3.4 Digital Monitoring Panel (continued)
3.4.6 Emergency Power Off Pushbutton
To be used only for emergency conditions where instant shutdown of the
UPS is required. The red EPO pushbutton is normally illuminated so that it may
be located easily, even in the dark. Depressing the EMERGENCY POWER OFF
(EPO) pushbutton results in immediate shutdown of operations, opening all UPS
breakers and the DC (battery) disconnect, the audible alarm sounds and all power
to the critical load is shut off. Once the EPO has been activated, the UPS must be
manually restarted. (The EPO also may be activated remotely by a contact closure.)
CAUTION
Any time the UPS has been shut down by using the EPO,
the system should be carefully checked by trained facilities
personnel before restarting.
3.5 System Controls
Controls for the UPS, with the exception of the pushbuttons located on the
face of the UPS module indicator panel, are situated inside the right-hand door of
the module cabinet. Since the cabinet is routinely kept locked, this provides some
degree of security from tampering with the system.
UPS CONTROL
switch: This switch is rotated clockwise to energize the
power supply to turn on the system logic or Digital Signal Processor logic.
INPUT CIRCUIT BREAKER:
When closed, allows UPS input power to
supply the rectifier and SBS input on units having a single input.
