Transfer From Internal Maintenance Bypass To Normal Mode (Optional On 80-120Kva); Ups And Critical Load Shutdown; Figure 6-8. 80-120Kva Optional Internal Maintenance Bypass Switch Arrangement - Eaton 9E Installation And Operation Manual

UPS Operating Instructions
Power is present inside the UPS cabinet.

6.3.8 Transfer from Internal Maintenance Bypass to Normal Mode (Optional on 80-120kVA)

To transfer the load to Normal mode:
1. Close the Neutral switch, slide the cover plate right and tighten the screws.
2. Close the Input and Bypass input switches.
3. Command the UPS to run in Bypass mode via the Control panel.
4. Verify that the LCD/LED display indicates the UPS is in Bypass mode.
5. Close the Output switch.
6. Open the Maintenance Bypass switch, slide the cover plate left and tighten the screws.
7 . Command the UPS to transfer to Normal mode via the control panel.

6.3.9 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.
Power is present inside the UPS cabinet after the upstream input feeder circuit breakers are
opened because of the installed external battery cabinet.
4. If the UPS contains an Input switch, the UPS Input switch.
5. If the UPS contains a Bypass input switch, open the Bypass input switch.
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.
6-14 Eaton 9E UPS (80-200 kVA, 380/400/415V) Installation and Operation Manual
Output Maintenance
switch

Figure 6-8. 80-120kVA Optional internal Maintenance Bypass switch arrangement

WARNING
Bypass Input
Bypass input switch
switch switch
WARNING
Neutral
switch