9
Single UPS Operation
(continued)
Reserve AC Input Supply Mode
In this mode, the power module's inverter has encountered one of several abnormal operating conditions including overtemperature, continual
overload, shorted output or depleted battery power. The power module automatically shuts down the inverter to prevent damage. In order to bypass
the inverter, the power module automatically transfers to a reserve AC input source to support the connected equipment load. (Note: since the power
module's inverter is bypassed in this mode, the UPS will not be able to switch to Back-Up Mode in the event of a power failure.) After the power
module detects that abnormal operating conditions are over, it automatically reactivates the inverter and switches back to the mains AC input source
to support the connected equipment load.
Maintenance Bypass Mode
In this mode, the Manual Maintenance Procedure (On Bypass) has been performed in order to pass-through filtered AC input power (from a reserve
AC input source) to connected equipment loads while allowing maintenance on the UPS power module. (Note: since the power module's inverter
is bypassed in this mode, the UPS will not be able to switch to Back-Up Mode in the event of a power failure.) After the Manual Maintenance
Procedure (Off Bypass) has been performed, the power module automatically reactivates the inverter and switches back to the mains AC input
source to support the connected equipment load.
Start-Up Procedure
This procedure supplies power to and starts up the UPS. Please check the following items before UPS start-up:
K
Ensure that all electrical connections to the power module and battery module(s) have been completed.
K
Check that all circuit breakers and isolators are in the off position and battery fuse(s) have been removed.
K
Ensure that the neutral line and grounding are at the same voltage level.
K
Apply power to the AC input cables, and check that input voltage, frequency and phase sequence are within the specifications of the UPS and
the equipment load.
K
Check to ensure auxiliary power and fan power (N) fuse isolators are closed.
