Transferring To Bypass Mode - Huawei UPS5000-E-400 kVA User Manual

UPS5000-E-(360 kVA-480 kVA)
User Manual (40 kVA Power Modules)
Step 2 Open the main and bypass input circuit breakers. When no main or bypass input is available,
close the BCB. If multiple battery strings are installed, close the circuit breaker for each
battery string and then close the main 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 sum of the absolute voltage of the negative battery string and the
voltage of the positive battery string is greater than a certain value (2.0 x Number of cells), the
batteries are connected properly.
Step 4 Press the battery cold-startup button on the bypass module, Huawei logo and initialization
progress are displayed on the MDU.
Figure 5-22 Battery cold-startup button
Step 5 After LCD initialization, start the inverter.
----End

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.
Issue 07 (2020-01-10)
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.
Copyright © Huawei Technologies Co., Ltd.
5 Operations
165