4.8 Transferring from Maintenance Bypass Mode to
Normal Mode
Context
Before transferring the UPS from maintenance bypass mode to inverter mode,
ensure that the bypass input and output are normal.
Procedure
Step 1 Turn o the maintenance bypass switch.
The Maint. breaker closed alarm disappears from the alarm list. View the system
running diagram on the LCD or WebUI to check whether the system works in
bypass mode.
Reinstall the stopper or barrier on the maintenance bypass switch if any.
Step 2 Start UPS inverters.
----End
4.9 Performing EPO
● After the EPO button is turned on, the UPS supplies no power and the loads
shut down.
● In maintenance bypass mode, the UPS continues to supply power even after
the EPO button is turned on.
Press the external EPO switch that connects to the dry contact card or remove the
4-pin terminal on the EPO port of the dry contact card.
Figure 4-16 EPO ports
UPS5000-E-(30 kVA–120 kVA)-FM
User Manual 4 Operations
Issue 03 (2022-01-30) Copyright © Huawei Technologies Co., Ltd. 106
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