UPS2000-A-(6 kVA-10 kVA)
User Manual
5 Operations
Issue 05 (2019-12-19)
Copyright © Huawei Technologies Co., Ltd.
108
(4) AC output circuit breaker
of UPS 2
(5) General AC input
circuit breaker of the
parallel system
(6) General AC output
circuit breaker of the
parallel system
(7) Maintenance bypass circuit
breaker of the parallel system
(8) Circuit breaker of
battery string 1
(9) Circuit breaker of
battery string 2
Context
Before performing the following steps, check that the maintenance bypass of the parallel
system power supply works properly. If the maintenance bypass is abnormal, the system may
be powered off.
Procedure
Step 1
Manually shut down each UPS in the parallel system for the parallel system to transfer to
bypass mode.
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
. Then, switch on the maintenance bypass circuit breaker of the parallel
system.
Figure 5-46
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. Use a
multimeter to check the input voltage and output voltage of the UPS to be removed, check
that the UPS to be removed is power off, replace the UPS.
Step 6
After replacing the UPS, connect cables for the 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.
