Shenzhen Hpmont Technology Co., Ltd.
Chapter 8 Troubleshooting and Maintenance
HD3L Series Controller User Manual
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Periodical Maintenance
Customer should check HD3L every 3 to 6 months according to the actual environment so as to avoid
hidden problems and make sure the controller runs well for a long time.
General Inspection:
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Check whether the screws of control terminals are loose. If so, tighten them with a screw driver;
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Check whether the main circuit terminals are properly connected; whether the copper bar and
mains cables are overheated;
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Check whether the power cables and control cables are damaged, check especially for any wear on
the cable tube;
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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 HD3L has already been conducted in the factory. Do not do the test again.
Otherwise, HD3L might be damaged.
2. If insulation test to the motor is necessary, it should be done after input terminals U/V/W of motor have
been detached from HD3L Otherwise, HD3L will be damaged.
3. For controllers 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
The components that are easily damaged are: cooling fan and electrolytic capacitors of filters.
Their lifetime depends largely on their application environment and preservation. Users can decide the
time when the components should be replaced according to their service time.
Cooling fan
Life: 60,000 hours.
Possible cause of damages: Wear of the bearing, aging of the fan vanes.
Criteria: After the controller is switched off, check if the abnormal conditions such as crack existing on
fan vanes and other parts. When the controller is switched on, check if controller runs normally, and
check if there is any abnormal oscillation.
Electrolytic capacitors
Life: 50,000 hours
Possible cause of damages: High ambient temperature, aging of electrolyte and large pulse current
induced by rapid changing loads.
Criteria: Check if frequent over-current or overvoltage failures occur during controller start-up with
load. Check if there is any leakage of liquids. Check if the safety valve protrudes. Measure the static
capacitance and insulation resistance.
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