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Powerware BPIV Parallel Cabinet Installation and Operation
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4.4.6 Restarting a Single UPM
To restart a single UPM, perform the following procedure:
1.
If the UPM was isolated from the critical bus, contact Customer Service to
restore connection (refer to
Getting Help
in the Introduction to this manual).
2.
Observe monitor screen on the UPM becoming active as an indication of logic
power.
UPM logic is being powered from the critical bus.
3.
Ensure the UPM circuit breakers and switches are set as follows:
UPM Input Breaker (CB1)
OPEN
UPM Battery Breaker (CB2)
OPEN
UPM Maintenance Bypass Switch
UPS
4.
Close the UPM input feeder circuit breakers.
5.
If UPM is dual feed, close the UPM Bypass input feeder circuit breakers.
6.
Press the System Control pushbutton on the UPM. The System Control
screen appears.
7.
On the System Control screen, the PPU status should indicate SHUTDOWN,
after approximately 20 seconds
8.
On the UPM, close Battery breaker CB2.
9.
If installed, close the Battery breakers on Battery cabinets.
NOTE:
If Auto Start has been enabled, the UPMs and Parallel Cabinet start and
power up to NORMAL mode automatically once CB1 is closed.
10.
On the UPM, close Input breaker CB1.
11.
Select
NORMAL
from the System Control menu on UPM.
Normal Mode Requested appears on the screen. The UPM is commanded to turn on.
12.
Observe the following messages appear sequentially on the PPU status line:
WAITING FOR INPUT
DC STARTING
INVERTER STARTING
SYNCING
ONLINE
The rectifier and inverter turn on. When the inverter reaches full voltage, the UPM
synchronizes with the output and closes the output contactor. The UPM is online, in
parallel with the other system UPMs.
