Chapter 7 Troubleshooting and Maintenance
MONT20 User Manual V1.6 57
Periodical Maintenance
According to the operating environment, the controller shall be inspected regularly within 3-6 months
to eliminate the hidden trouble and ensure the long-term stable operation of the equipment with
high-performance.
General Inspection:
• Check whether the screws of control terminals are loose. If so, tighten them with a screw driver;
• Check whether the power terminals are firmly in contact, whether the copper bar and main cables
are overheated;
• Check whether the power cables and control cables are damaged, check especially for any wear on
the cable tube;
• Check whether the insulating tapes around the cable lugs are stripped, and for signs of overheating
near terminations;
• Clean the dust on PCBs and air ducts with a vacuum cleaner.
Note:
1. Dielectric strength test of MONT20 has already been conducted in the factory. Do not do the test again.
Otherwise, improper testing may damage MONT20.
2. When testing the insulation of the motor, the U / V / W terminal of the controller must be disconnected to
test the motor separately. Otherwise, MONT20 will be damaged.
3. For MONT20 that have been stored for a long time, they must be powered up every 2 years. When
supplying AC power to the controller, use a voltage regulator to gradually raise the input voltage to rated
input voltage at least 5 hours.
Replacing Damaged Parts
Electrolytic capacitors of filter are easily damaged.
Generally, life of electrolytic capacitors is 40, 000 - 50, 000 hours.
Due to high ambient temperature and frequent load jumps, the pulsating current increases and the
electrolyte is aging.
Criteria:
Check if frequent over-current or overvoltage faults occur during controller start-up with load.
Check if there is any leakage of liquids. Check if the safety value protrudes. Measure the static
capacitance and insulation resistance.
Scrap Disposal
• The capacitors may explode if they are burnt.
• Poisonous gas may be generated when the plastic parts like front covers are burnt.
• Please dispose of as industrial waste.
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