5
UPS (3 U)
Battery pack
(optional, 3 U)
Rubber plug
When you tower-
mount the UPS, place
devices including the
UPS horizontally to
facilitate cable
installation. Stand the
devices upright after
cable installation.
Tower-Mounted Installation
Scenario 2
2
Installing AC Input and Output Power Cables
1. bL indicates the bypass input, and mL indicates the mains input.
2. Connect UPS AC input and output power cables in the same phase sequence. Connect
battery terminals correctly.
3. Before connecting cables to the UPS, ensure that the input circuit breaker, output circuit
breaker, and battery circuit breaker are OFF to prevent operations with power on.
4. 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.
5. 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.
6. The copper bar and ground screws are M6. Tighten them to 4.8 N·m. The chassis screws are
M5. Tighten them to 2.8 N·m.
7. In a single UPS system, connect loads to AC OUTPUT sL and pL terminals. Connect primary
loads to the sL terminal and secondary loads to the pL terminal. For a parallel system,
connect loads to the AC OUTPUT pL terminal, instead of the sL terminal.
8. 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.
9. 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.
10.The cable colors in the figures are for reference only.
1. If the AC input of the 15 kVA/20 kVA UPS uses two live wires, connect bypass and mains
inputs bL1, bL2, bL3, mL1, mL2, and mL3 that are short-circuited with a short-circuit bar to
live wire L1, and connect the input N and N with a short-circuit bar to live wire L2.
2. If the AC input and AC output uses two live wires, the input and output must be connected
to two-pole circuit breakers provided by the customer.
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