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UPS Operating Instructions
10-2
Powerware
®
9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C
7. Observe the following messages appear sequentially on the power module (PM)
status line:
DC STARTING
INVERTER STARTING
INVERTER SYNCING
READY
ONLINE
The rectifier and inverter turn on. When the inverter reaches full voltage, UPS
output contactor K3 closes and the static switch turns off supplying power to the
critical load in Normal mode. It takes approximately 1 minute for the UPS to
achieve Normal mode.
8. Close the battery breaker any t ime after INVERTER SYNCING or CLOSE BATTERY
appears on t he display.
9. The UPS is now operating in Normal mode and the NORMAL status indicator is
illuminated.
10.1.2 Starting the UPS in Bypass Mode
IftheinverteroutputoftheUPSisnotavailableandthecriticalloadneedstobe
energized, perform the following procedure:
CAUTION
In Bypass mode, the critical load is not protected from commercial power interruptions and
abnormalities.
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 BYP ASS pushbutton on the System Controls menu bar.
The critical load is immediately supplied by the bypass source, in Bypass mode.
7. The UPS is now operating in Bypass mode and the BYPASS status indicator is
illuminated.