6 3 6 Transfer from Internal maintenance Bypass to normal mode
To transfer the load to Normal mode:
1. Output Breaker is all along closed.
2. Close the Input and Bypass input Breakers
3. Transform the 3-position Maintenance Bypass switch to ‘Test’ mode from ‘BYPASS’ mode.
4. Command the UPS to run in Bypass mode via the Control panel.
5. Verify that the LCD/LED display indicates the UPS is in Bypass mode.
6. Transform the 3-position Maintenance Bypass switch to ‘UPS’ mode from ‘TEST’ mode.
7.
Fix the cover over the 3-position maintenance Bypass switch and tighten the screws.
8. Command the UPS to transfer to Normal mode via the control panel.
6 3 7 uPS and Critical load Shutdown
To perform maintenance or service on the critical load, shut down power to the load:
1. Turn off all equipment that is being powered by the UPS.
2. Perform the LOAD OFF procedure in paragraph 6.3.12.
The output and bypass backfeed contactors (if fitted) open, and the power module is turned off.
3. Perform the battery charger off procedure in paragraph 6.3.10.
The input and battery contactors open.
WARNING
Power is present inside the UPS cabinet after the upstream input feeder circuit breakers are
opened because of the installed external battery cabinet.
4. Open the UPS Input breaker.
5. If the UPS contains a Bypass input breaker, open the Bypass input breaker.
6. If the UPS contains a Maintenance Bypass switch, open the Maintenance Bypass switch.
7. Open the UPS input and bypass feeder circuit breakers.
8. Open all external battery breakers.
Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual
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