Starting The Ups System In Bypass Mode; 6.4.3 Transfer From Double Conversion Mode To Bypass Mode - Eaton 93PR Series User And Installation Manual

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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:

In Bypass Mode, the critical load is not protected from commercial power interruptions and abnormalities.

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.

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 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.

Power is present inside the UPS cabinets.

CAUTION

NOTE

dANGER

25-75 kW

User's and Installation Guide

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