Huawei FusionModule1000A20 Maintenance Manual page 85

FusionModule1000A20 Prefabricated All-in-One
Data Center
Maintenance Guide
Impact on the System
None
Preparations
Tools: electroprobe, insulation gloves, flat-head screwdriver, Phillips screwdriver,
multimeter
Materials: spare MCB
Documents: none
Skill requirement: electrician's work permit
Procedure
Step 1 Determine the position of the faulty MCB, and open the corresponding cabinet
door.
Step 2 Remove the front panel of the PDC circuit breaker using a Phillips screwdriver.
Step 3 Switch a multimeter to the DC voltage mode to measure the voltage between
positive and negative copper bars at the upper part of the switch. If the voltage is
lower than 36 V DC for 1 minute, replace the MCB.
Step 4 Remove the three cables from the top and bottom of the MCB.
● When removing cables, remove the cable from the bottom of the MCB first.
● After removing cables, insulate the cable terminals.
● When removing cables, label the cables with corresponding terminal ports for
later connection.
Step 5 Push the buckle at the MCB outwards using a flat-head screwdriver, and remove
the faulty MCB.
Step 6 Install the new MCB by referring to the preceding method, connect cables, and
tighten screws.
Step 7 Reinstall the removed components, and close the corresponding cabinet door.
----End
Follow-up Procedure
Dispose of the removed MCB that is confirmed faulty.
Issue 03 (2022-12-15)
NO TICE
Copyright © Huawei Digital Power Technologies Co., Ltd.
6 Parts Replacement
78