UPS2000-A-(6 kVA-10 kVA)
User Manual
Copyright © Huawei Technologies Co., Ltd.
Procedure
Step 1 Manually shut down each UPS in the parallel system for the parallel system to transfer to
bypass mode. For details on how to shut down a UPS.
Step 2 Remove the maintenance bypass circuit breaker cover from the rear panel of each UPS in the
parallel system and switch on the maintenance bypass circuit breaker.
Step 3 View the liquid crystal display (LCD) to check that each UPS works in bypass mode, as
shown in Figure 5-44. Then, switch on the maintenance bypass circuit breaker of the parallel
system.
Figure 5-44 Bypass mode
Step 4 Switch off the AC input circuit breaker, the AC output circuit breaker, and the battery circuit
breaker in sequence for each UPS.
Step 5 Switch off the general input and output circuit breakers of the parallel system.
Step 6 After adding the UPS, connect cables for the new parallel system.
Step 7 Switch off the maintenance bypass circuit breaker on the rear panel of each UPS in the
parallel system and reinstall the maintenance bypass circuit breaker cover on the rear panel.
Switch on the input circuit breaker, each branch circuit breaker, the output circuit breaker, and
the battery circuit breaker of the parallel system.
Keep the AC output circuit breaker of the parallel system OFF.
Step 8 Set parameters and start the system. If there is more than one UPS.
Step 9 Check whether the new parallel system is working properly. If yes, shut down the system and
switch on the AC output circuit breaker of the parallel system.
Step 10 Switch off the maintenance bypass circuit breaker of the parallel system and start the system.
----End
5.3.6 Replacing a UPS from a Parallel System
Prerequisites
If a maintenance bypass circuit breaker is installed for a parallel system, you can maintain a
UPS in the parallel system. If a maintenance bypass circuit breaker is not installed, power off
the entire system before maintaining a UPS.
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