Starting The Power Module; Transfer From Normal To Bypass Mode - Powerware 9390 Installation & Operation Manual

10.1.3 Starting the Power Module

To start the power module without transferring the critical load to normal, perform the
following procedure:

10.1.4 Transfer from Normal to Bypass Mode

To transfer the critical load to Bypass mode, perform the following procedure:
Powerware 9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C
®
1. Close the UPS input feeder circuit breaker.
2. If the UPS is dual feed, close the UPS Bypass input feeder circuit breaker.
3. Observe the UPS control panel becoming active, indicating logic power.
4. Press the CONTROLS pushbutton on the main menu bar. The System Controls
screen appears.
5. On the System Controls screen, the power module (PM) status should indicate
SHUTDOWN.
6. Press the pushbutton to display System Controls Screen 2.
7. Press the PM ON pushbutton on the System Controls menu bar.
8. Observe the following messages appear sequentially on the power module (PM)
status line:
DC STARTING
INVERTER STARTING
INVERTER SYNCING
READY
The rectifier and inverter turn on. When the inverter reaches full voltage, the UPS
is ready to transfer to the Normal mode and supply the critical load.
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. The System Controls
screen appears.
2. Press the BYPASS pushbutton on the System Controls menu bar.
The UPS transfers 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.
UPS Operating Instructions
C A U T I O N
10-3