Huawei UPS5000-H User Manual page 366

UPS5000-H-(1200 kVA-1600 kVA)
User Manual (100 kVA Power Modules)
4.
Step 2 Trigger EPO on each UPS.
1.
2.
Step 3 Install parallel cables between parallel cabinets.
Figure 8-1 Control cable connections in a parallel system of four UPSs
Step 4 Power on the parallel system.
1.
2.
3.
If the input power is normal, the rectifier starts automatically. The MDU starts and
displays the Huawei logo and a progress bar. Wait until the MDU starts properly.
Step 5 Check that the software versions of all UPSs are consistent.
Issue 05 (2021-10-13)
Use a multimeter to measure the impedance between phases A, B, and C of
the mains/bypass input and AC output of any two UPSs. If the measured
result is low conducted resistance, check whether the mains/bypass input and
AC output phase sequences of the two UPSs are correct.
Press the EPO switches connected to the dry contact cards of all UPSs one by
one, or remove the 4-pin terminals from the EPO ports on the dry contact
cards of all UPSs, or remove the general EPO switch.
If a single UPS is not powered off after commissioning, verify on the
monitoring screen that EPO has been activated successfully.
Turn off the output switch of each UPS to ensure that the output of each UPS
is independent.
Switch on the input SPD circuit breaker.
Turn on the external bypass input and mains input power distribution
switches.
NO TE
If the input SPD circuit breaker is not switched on, the system can start properly, but an
Input surge arrester alarm will be reported.
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8 Parallel System Commissioning
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