UPS2000-G-(6 kVA-20 kVA)
User Manual
Copyright © Huawei Technologies Co., Ltd.
After you perform "startup operations" on UPS 1 to UPS n one by one, UPS 1 to UPS n are starting. If
you do not perform "startup operations" on the other UPSs in 5 minutes, UPS 1 to UPS n enter normal
mode, and the other UPSs supply no power.
Step 6 When the parallel system runs properly, close the general output circuit breaker Q (provided
by the customer) and then branch output circuit breakers (provided by the customer), and start
the loads.
----End
5.3.2 Shutting down the Parallel System
Shutting down a Single UPS in the Parallel System
Step 1 Perform "shutdown operations" twice on a single UPS within 30 seconds (for example, UPS 1
shown in Figure 5-3) in the parallel system. The UPS is shutting down. The other UPSs
continue working.
The UPSs in the parallel system have shut down supply no power (the mains indicator, bypass indicator,
and battery indicator are Off).
Step 2 Open the UPS mains input circuit breaker K
m
1, bypass input circuit breaker K
b
1, and the AC
output circuit breaker Q1. After all indicators turn off and fans stop, the UPS shuts down.
Step 3 Open the external battery circuit breaker (if there is), or disconnect battery cables. The UPS
exits the parallel system.
To merely shut down the UPS, perform Step 1 only.
----End
Transferring the Parallel System to Bypass Mode
Perform "shutdown operations" on each UPS in the parallel system. All inverters shut down at
the same time, and the parallel system transfers to bypass mode.
Shutting down the Parallel System
Step 1 Shut down the loads.
Step 2 Perform "shutdown operations" on each UPS in the parallel system. All inverters shut down at
the same time. The parallel system transfers to bypass mode.
Step 3 Open the following circuit breakers in sequence for each UPS: UPS mains input circuit
breakers K
m
1 and K
m
2, general mains input circuit breaker K
m
, bypass input circuit breakers
K
b
1 and K
b
2, general bypass input circuit breaker K
b
, UPS AC output circuit breakers Q1 and
Q2, and general AC output circuit breaker Q. After all indicators turn off and fans stop, the
UPSs shut down, and the loads power off.
Perform Step 3 when there are two mains inputs. In the case of one mains input, you need only to open
the following circuit breakers in sequence for each UPS: UPS mains input circuit breakers, general
mains input circuit breaker, UPS AC output circuit breakers, and general AC output circuit breaker.
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