25-75 kW
User's and Installation Guide
63
6.4.2 Starting the UPS System in Bypass Mode
If the inverter output of the UPS is not available and the critical load needs to be energized, peform the
following procedure:
CAUTION
InBypassMode,thecriticalloadisnotprotectedfromcommercialpowerinterruptionsandabnormalities.
1. Unfasten the front door latch and swing the door open.
2. Verify that rectifier input switches, bypass input switch, neutral switch are closed if included inside the UPS
system, and verify that battery breaker is closed, and close the front door.
3. Close the UPS input feeder circuit breaker.
4. Close the UPS bypass input feeder circuit breaker.
5. Observe the UPS control panel becoming active, indicating logic power. Repeat steps 1-5 for each single
UPS in the system.
6. Press the
Controls
button in the main menu. The System Controls screen appears.
7. On the System Controls screen, the system status should indicate SHUTDOWN.
8. Press the
Go to bypass
button in the System Controls screen.
The critical load is immediately supplied by the bypass source, in Bypass Mode.
9. The UPS system is now operating in Bypass Mode and the BYPASS status indicator is illuminated.
6.4.3 Transfer from Double Conversion Mode to Bypass Mode
To transfer the critical load to Bypass Mode, perform the following procedure:
NOTE
InBypassMode,thecriticalloadisnotprotectedfromcommercialpowerinterruptionsandabnormalities.
1. Press the
Controls
button in the main menu. The System controls screen appears.
2. Press the
Go to bypass
button in the System Controls screen. The UPS system 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.
3. The UPS system is now operating in Bypass Mode and the BYPASS status indicator is illuminated. The
UPM status indicates READY. The system status indicates ON BYPASS.
DANGER
PowerispresentinsidetheUPScabinets.
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