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7 Troubleshooting
This chapter gives the basic troubleshooting methods for customer as a
reference.
7.1 Before troubleshooting
Please notice the following items before troubleshooting:
Disconnect the DC switch before operation.
Please do not touch the bare metal parts of the copper bar under the
protection plate.
Pull the fuse holder for maintenance of the combining busbar and to
disconnect the input cable.
High voltage still exists after DC breaker is switched off.
The fuse holders are still live after fuses are removed.
7.2 Common faults and troubleshooting
Fault
Possible
cause
Method of correction
RS485
communication
fault
Monitoring
power board is
fault
Check if fuse inside the monitor power
board is broken. Replace the fuse if
necessary.
If the fuse is normal, replace the
switch power pack.
Communication
cable
interference
Twisted pair shielded cable shall be
used, with shielding layer grounded.
Install a
120Ω resistor between
communication terminals A2 and B2 of
the last combiner box. Refer to
”.
