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Make sure no block on airflow around the controller. Clear up any dirt and
fragments on the radiator.
Check all the naked wires to make sure insulation is not damaged for sun
exposure, frictional wear, dryness, insects or rats, etc. Repair or replace some
wires if necessary.
Verify the indicator display is consistent with the actual operation. Pay attention
to any troubleshooting or error indication. Take corrective action if necessary.
Confirm that all terminals have no corrosion, insulation damaged, high
temperature or burnt/discolored sign, tighten terminal screws to the suggested
torque.
Clear up dirt, nesting insects, and corrosion in time.
Replace a new surge arrester in time to avoid damaging the controller and even
other equipment.
WARNING：Risk of electric shock! Make sure that all the power is turned off
before the above operations, and then follow the corresponding inspections
and operations.
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