18
2
Installing AC Input and Output Power Cables
1. Ensure that the AC input and output power cables on each UPS are connected in the same
phase sequence, battery terminals are connected correctly, and the bypass power cables are
connected in the same phase sequence.
2. Before cable connection, switch off all circuit breakers in the parallel system.
3. If the input or output wiring has to be changed, contact Huawei technical support if you are
not familiar with the operation. Do not power on the UPS directly.
1. When installing short-circuit bars, install the AC INPUT short-circuit bar and cables, and then
install the AC OUTPUT short-circuit bar and cables.
2. If the input or output system is changed, ensure that the short-circuit copper bar status and
cable connections at input and output ports are correct.
3. The UPS can generate large leakage currents. A circuit breaker equipped with a residual
current device (RCD) is not recommended. If leakage protection is required, select a
recommended circuit breaker.
4. Circuit breakers used for cable connection need to be provided by the customer.
5. When UPSs are connected in parallel, the output parallel power cables of each UPS must be
at least 1 m long and the length deviation must be less than
±
10%. The four cables must be
connected at the remote end.
6. If the parallel system uses the TN-C power distribution system, install magnetic rings around
the PE cables on each UPS, bind the magnetic rings together using cable ties, and secure the
magnetic rings nearby. Magnetic rings are optional. For details about the model and usage,
see the
UPS2000-G-(6 kVA-20 kVA) User Manual
.
1. bL indicates the bypass input, and mL indicates the mains input.
2. K indicates the general AC input circuit breaker, K
m
indicates the general mains input circuit
breaker, and K
b
indicates the general bypass input circuit breaker. K1, K
m
1, and K
b
1 indicate
UPS 1 input circuit breakers. K2, K
m
2, and K
b
2 indicate UPS 2 input circuit breakers. Q
indicates the general AC output circuit breaker. Q1 indicates the UPS 1 output circuit breaker.
Q2 indicates the UPS 2 output circuit breaker.
Connect cables based on site requirements. For details about the wiring terminals, external circuit
breakers, leakage current breakers, distribution cross-sectional areas, and terminal types, see the
method for a single UPS system.