4--6
Powerware BPIV Parallel Cabinet Installation and Operation
164201409 REV. B
101503
7.
On the System Control screen of each UPM, the PPU status should indicate
SHUTDOWN, after approximately 20 seconds
8.
Select
BYPASS
from the System Control menu.
Bypass Mode Requested appears on the screen. The Parallel Cabinet bypass
contactor K4 closes, and the critical load is immediately supplied by the Parallel
Cabinet bypass source, in Bypass mode.
9.
The Parallel System is now operating in the Bypass mode and the
BYPASS
status indicator on the Parallel Cabinet and all UPMs is illuminated.
4.4.3 Transfer from Normal Mode to Bypass Mode
To transfer the critical load to bypass, perform the following procedure:
WARNING:
In Bypass Mode, the critical load is not protected from commercial power
interruptions and abnormalities.
1.
Press the System Control pushbutton on any UPM. The System Control
screen appears.
2.
Select
BYPASS
from the System Control menu on any UPM.
Bypass Mode Requested appears on the screen. The Parallel Cabinet bypass
contactor K4 closes, all UPM output contactors open, and the critical load is
immediately supplied by the Parallel Cabinet bypass source, in Bypass mode.
If the bypass source is not available, the UPMs remain on and an alarm sounds.
3.
The Parallel System is now operating in the bypass mode and the
BYPASS
status indicator is illuminated.
The UPM PPU status indicates READY. System is now on bypass and all UPM
power processors remain on. All UPM
BYPASS
status indicators are
illuminated.
WARNING:
Power is present inside the UPMs and Parallel cabinets.
4.4.4 Transfer from Bypass Mode to Normal Mode
To transfer the critical load to normal, perform the following procedure:
1.
Press the System Control pushbutton on any UPM. The System Control
screen appears.
2.
Select
NORMAL
from the System Control menu on any UPM.
Normal Mode Requested appears on the screen. The UPM output contactors close
and the Parallel Cabinet bypass contactor opens, supplying power to the critical load
in Normal mode. If the required number of UPMs are not available, the system
remains on bypass and an alarm sounds.
3.
The Parallel System is now operating in the Normal mode and the
NORMAL
status indicator is illuminated.
The UPM PPU status indicates ONLINE and the critical load is protected from
commercial power interruptions and abnormalities.
