In order to maintain the best long-term performance for the controller, conduct inspections twice a year using the following points:

• Make sure the airflow around the controller is unobstructed and remove any dirt or debris from the heat sink.

• Check if the insulation layers of all exposed wires are damaged due to sun exposure, friction with other objects nearby, dry rot, destruction of insects or rodents. If so, it may be necessary to repair or replace the wire.

• Verify if indicators are consistent with the device operations. Please note to take corrective action for any malfunctions or error indications.

• Check all wiring terminals for corrosion, insulation damage, signs of high temperature or burning/discoloration. Tighten terminal screws.

• Check for dirt, insects and corrosion and clean as required.

Warning: Danger, electric shock hazards! Make sure that all power supplies to the controller have been disconnected before check or operation as above

ERRORS AND WARNINGS