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UPS Operating Instructions
10-11
Powerware
®
9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C
10.2.5 Single UPM Shutdown
To shut down a single UPM, perform the following procedure:
NOTE
The UPM can be shut down only if remaining UPMs can support the critical
load without being overloaded.
1. Press the CONTROLS pushbutton on the main menu bar on the UPM to be shut
down. The System Controls screen appears.
2. Press the
pushbutton to display System Controls Screen 2.
3. Press the PM OFF pushbutton on the System Controls menu bar.
The power module (PM) status indicates SHUTDOWN. The input and output
contactors open, the battery breaker or disconnect is tripped, and the power
module is turned off.
4. Open the input and bypass (if dual feed) feeder circuit breakers supplying the
shutdown UPM.
NOTE
ThemonitorscreencontinuestobeactiveuntiltheUPMisisolatedfromthe
critical bus.
WARNING
Power is present inside the shutdown UPM cabinet due to connection to the critical bus, until
the UPM output breaker is opened.
5. If it is necessary to isolate the UPM from the critical bus, open the module output
breaker on the tie cabinet or distribution panel.
10.2.6 Restarting a Single UPM
To restart a single UPM, perform the following procedure:
1. IftheUPMwasisolatedfromthecriticalbus,closethemoduleoutputbreakeron
the tie cabinet or distribution panel.
2. Observe the UPM control panel display becoming active, indicating logic power.
UPM logic is being powered from the critical bus.
3. Close the UPM input feeder circuit breaker.
4. If the UPM is dual feed, close the UPM Bypass input feeder circuit breaker.
5. Press the CONTROLS pushbutton on the main menu bar of the UPM. The System
Controls screen appears.
6. On the System Controls screen, the power module (PM) status should indicate
SHUTDOWN.