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UPS Operating Instructions
10-10
Powerware
®
9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C
10.2.3 Transfer Parallel System from Normal to Bypass Mode
To transfer the critical load to Bypass mode, perform the following procedure:
CAUTION
In Bypass mode, the critical load is not protected from commercial power interruptions and
abnormalities.
1. Press the CONTROLS pushbutton on the main menu bar on any UPM. The System
Controls screen appears.
2. Press the BYP ASS pushbutton on the System Controls menu bar of any UPM.
TheUPMstransfertoBypassmodeandthecriticalloadisimmediatelysuppliedby
the bypass source. If the bypass source is not available, the power processor
remains on and an alarm sounds.
3. The UPMs are now operating in Bypass mode and the BYP ASS status indicator on
each UPM is illuminated.
The power module (PM) status indicates READY on each UPM. The system is
now on bypass and the UPM power processors remain on.
WARNING
Power is present inside the UPM cabinets.
10.2.4 Transfer Parallel System from Bypass to Normal M ode
To transfer the critical load to Normal mode, perform the following procedure:
1. Press the CONTROLS pushbutton on the main menu bar on any UPM. The System
Control screen appears.
2. Press the NORMAL pushbutton on the System C ontrols menu bar of any UPM.
The UPMs transfer to Normal mode. If the power processor is not available, the
system remains on bypass and an alarm sounds.
3. The UPMs are now operating in Normal mode, and the NORMAL status indicator
on each UPM is illuminated.
The power module (PM) status indicates ONLINE on each UPM.