PowerTech MP3741, User Manual

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4.3 Maintenance
The following inspections and maintenance tasks are recommended at least two
times per year for best performance.
Make sure controller firmly installed in a clean and dry position.
Make sure there is no blockage of air-flow around the controller. Clear up any
dirt and fragments on heatsink.
Check all cables to ensure insulation is not damaged by insulation breakdown,
frictional wear, dryness, insects or rats etc.
Tighten all the terminals. Inspect for loose, broken, or burnt wire connections.
Check and confirm that LCD readings are correct. Pay attention to any
troubleshooting or error indications .Take corrective action as necessary.
Confirm that all the system components are ground connected tightly and
correctly.
Confirm that all the terminals have no corrosion, insulation damage, signs of high
temperature or discoloration. Check for dirt, insect infestation (particularly ants
and mud hornet nests blocking airflow) and corrosion. If so, correct immediately.
Check and confirm that lightning arrester is in good condition if used.
WARNING ： Risk of electric shock!
Make sure that all the power is turned off before above operations, and
then follow the corresponding inspections and operations.