UPS5000-A-500 kVA
User Manual (e-shelter)
5 Operations
Issue 02 (2020-01-10)
Copyright © Huawei Technologies Co., Ltd.
154
5.7 Transferring to Maintenance Bypass Mode
Prerequisites
The maintenance bypass unit has been installed.
Context
Strictly observe the following procedure to transfer the UPS to maintenance bypass mode.
Otherwise, loads may power off.
In maintenance bypass mode, the mains supplies power to the loads directly over the
maintenance bypass. If the mains is abnormal, the loads may power off.
Procedure
Step 1
Manually switch the UPS to bypass mode.
Step 2
Turn on the maintenance bypass switch.
After the UPS transfers to maintenance bypass mode, the
Maint. breaker closed
and
Bypass mode
alarms are displayed on the MDU.
----End
5.8 Transferring from Maintenance Bypass Mode to
Normal Mode
Context
Before you transfer the UPS from maintenance bypass mode to normal mode, ensure that the
bypass input and output are normal.
Procedure
Step 1
Turn off the maintenance bypass switch.
Turn the maintenance bypass switch from the ON position to the OFF position.
The
Maint. breaker closed
alarm disappears from the alarm list. Check whether the UPS
works in bypass mode by viewing the system running status diagram on the LCD or WebUI.