UPS5000-E-(25 kVA-75 kVA)-SM
User Manual (Half Height)
5 Operations
Issue 03 (2019-12-13)
Copyright © Huawei Technologies Co., Ltd.
137
Step 2
Open the upstream mains input and bypass input switches, and close the battery circuit
breaker. If there are multiple battery strings, close the circuit breaker for each battery string
and then the general circuit breaker between battery strings and the UPS.
Step 3
Use a multimeter to measure the positive and negative battery string voltages at the UPS
battery input terminal. If the absolute values of the voltages are greater than a certain value
(single battery voltage x number of batteries in the battery string), the batteries are connected
properly.
Step 4
Press and hold down the
BATT START
button on the bypass unit for at least 2 seconds. The
system automatically enters the battery cold start status. The LCD displays the Huawei logo
and an initialization progress bar.
Step 5
After LCD initialization, start the inverter on the LCD.
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5.1.4 Transferring to Bypass Mode
Before shutting down the inverter, ensure that the bypass is normal. If the bypass is not
normal, after the inverter is shut down, the UPS supplies no power, and the loads shut down.
Shut down the UPS inverter. Shut down the inverter on the LCD or WebUI, and the UPS
transfers to bypass mode.
If the inverter is shut down when the input voltage or frequency exceeds the specified threshold, the
UPS supplies no power, and the loads shut down.
5.1.5 Setting ECO Mode
Context
The UPS is set to ECO mode by default. Set the UPS to ECO mode when energy saving
is required.
In ECO mode, the bypass takes priority over the inverter in supplying power. If the
bypass is disconnected, the UPS switches to normal mode. The switchover time is less
than 4 ms for typical working conditions and is less than 20 ms under harsh working
conditions.
Both a single UPS and the parallel system support the ECO mode for higher efficiency.
To avoid frequent transfer between ECO mode and normal mode, do not set the ECO
mode when the bypass input is unstable or is sensitive to load changes.
ECO mode is not recommended when the load is less than 10%.
Before transferring the UPS to ECO mode, ensure that the bypass unit works properly.
Before you set ECO mode, check that the voltage system settings match the local power
supply environment.