Transfer Parallel System From Normal To Bypass Mode; Transfer Parallel System From Bypass To Normal Mode - Powerware 9390 Installation & Operation Manual

UPS Operating Instructions

10.2.3 Transfer Parallel System from Normal to Bypass Mode

To transfer the critical load to Bypass mode, perform the following procedure:
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
2. Press the BYPASS pushbutton on the System Controls menu bar of any UPM.
3. The UPMs are now operating in Bypass mode and the BYPASS status indicator on
Power is present inside the UPM cabinets.

10.2.4 Transfer Parallel System from Bypass to Normal Mode

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
2. Press the NORMAL pushbutton on the System Controls menu bar of any UPM.
3. The UPMs are now operating in Normal mode, and the NORMAL status indicator
10-10
Controls screen appears.
The UPMs transfer to Bypass mode and the critical load is immediately supplied by
the bypass source. If the bypass source is not available, the power processor
remains on and an alarm sounds.
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.
Control screen appears.
The UPMs transfer to Normal mode. If the power processor is not available, the
system remains on bypass and an alarm sounds.
on each UPM is illuminated.
The power module (PM) status indicates ONLINE on each UPM.
Powerware 9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C
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