Liebert 2U - Manual (Page 12)

8
OPERATION
Transfer to Maintenance Bypass
To transfer to maintenance bypass (mains) from UPS, use the following steps:
1. Ensure the MAINS lamp (orange) is illuminated. If the lamp is not illuminated, refer to
Troubleshooting section.
2. Transfer the rotary switch from UPS to MAINS, provided the MAINS lamp is illuminated
on the 2U POD.
3. Turn the UPS off.
4. Disconnect the two cables connecting the UPS to the 2U POD.
5. You may now service the UPS.
Transfer to UPS
To transfer to UPS from maintenance bypass (mains), use the following steps:
1. Reconnect the UPS to the 2U POD. Start the UPS according to the instructions in the
UPS user manual.
2. Verify that UPS lamp (green) on the 2U POD is illuminated. If so, transfer the rotary
bypass switch from MAINS to UPS. If the lamp does not illuminate, refer to
Troubleshooting section.
3. Conditioned power is now being supplied through the UPS.