UPS5000-E-(50 kVA-300 kVA)
User Manual (50 kVA Power Modules)
5 Operations
Issue 02 (2017-02-25)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
218
Figure 5-19
Abnormal bypass
If you need to shut down the inverter and transfer the UPS to bypass mode, check that the UPS has
not generated an alarm and perform
To power off the entire UPS, perform all the following steps.
Step 2
After the inverter shuts down, open the external output switches.
Step 3
Open the battery string circuit breaker. If there are multiple battery strings, open the general
circuit breaker between battery strings and the UPS and then open the circuit breaker for each
battery string.
Step 4
For a UPS in full configuration:
1.
Open the internal mains input switch, bypass input switch, and output switch.
2.
Open the external mains and bypass input switches.
Step 5
For a UPS in standard configuration, open the external mains and bypass input switches.
----End
5.3 Starting the UPS in Battery Mode
Procedure
Step 1
Ensure that batteries are properly connected. Use a multimeter to check that the sum of the
absolute voltages of positive and negative battery strings are greater than a certain value (2 x
Number of cells).
Step 2
Open the mains and bypass input circuit breakers. If the mains and bypass have no input,
close the battery circuit breaker. If there are multiple battery strings, close the circuit breaker
for each battery string and then the general circuit breaker between battery strings and the
UPS.
Step 3
Measure the UPS battery string voltages in the battery input route by using a multimeter. If
the sum of the absolute voltages of positive and negative battery strings are greater than a
certain value (2 x Number of cells), the batteries are connected properly.