Eaton 91PS User Manual

7.4.2 Start the UPS system in the bypass mode
CAUTION
In the bypass mode, the critical load is not protected from mains power
interruptions and abnormalities.
If the inverter output of the UPS is not available and the critical load needs to be
energized, do the following procedure:
1. Open the UPS front door.
2. Make sure that the rectifier input switch S1 is closed.
3. Make sure that the battery breaker CB1 is closed.
4. Close the front door.
5. Close the UPS input feeder circuit breaker.
6. Close the UPS bypass input feeder circuit breaker.
7. Wait for the UPS control panel to become active and indicate logic power.
8. Repeat steps 1-7 for each single UPS in the system.
9. In the home screen, press Controls.
The System controls screen appears.
10. In the System Controls screen, check that the system status is shown as
SHUTDOWN.
11. In the System controls screen, press the Go to bypass button.
The critical load is immediately supplied by the bypass source, in the bypass
mode.
The UPS system is now operating in the bypass mode. The yellow bypass status
indicator is lit.
7.4.3 Transfer from the double conversion mode to the bypass mode
CAUTION
In the bypass mode, the critical load is not protected from mains power
interruptions and abnormalities.
To transfer the critical load to the bypass mode.
1. In the home screen, press Controls.
The System controls screen appears.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 96 (126)
Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide

Eaton 91PS Specifications

General

Brand	Eaton
Model	91PS
Category	UPS
Language	English