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General Inspection:
1. Check whether the screws of control terminals are loose. If so, tighten them with a screwdriver;
2. Check whether the main circuit terminals are properly connected; whether the mains cables are over heated;
3. Check whether the power cables and control cables are damaged, check especially for any wear on the cable tube;
4. Check whether the insulating tapes around the cable lugs are stripped;
5. Clean the dust on PCBs and air ducts with a vacuum cleaner;
6. For drives that have been stored for a long time, it must be powered on every 2 years. When supplying AC
power to the drive, use a voltage regulator to raise the input voltage to rated input voltage gradually. The drive
should be powered for 5 hours without load.
7. Before performing insulation tests, all main circuit input/output terminals should be short-circuited with conductors.
Then proceed insulation test to the ground. Insulation test of single main circuit terminal to ground is forbidden;
otherwise the drive might be damaged.
Please use a 500V Mega-Ohm-Meter.
8. Before the insulation test of the motor, disconnect the motor from the drive to avoid damaging it.
Note:
Dielectric Strength test of the drive has already been conducted in the factory. Do not do the test again, otherwise, the
internal components might be damaged.
Using different component to substitute the original component may damage the dirver.
8.3 Replacing Wearing 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. Normally, lifetime is shown in following table.
Table 8-2 Lifetime of components
Components
Lifetime
Fan
3~40,000 hours
electrolytic capacitor
4~50,000 hours
Relay
About 10,000 times
You can decide the time when the components should be replaced according to their service time.
1.Cooling fan
Possible cause of damages: wear of the bearing, aging of the fan vanes.
Criteria:After the drive is switched off, check whether abnormal conditions such as crack exists on fan vanes and other
parts. When the drive is switched on, check whether drive running is normal, and check whether there is any abnormal
vibration.
2. Electrolytic capacitors
Possible cause of damages: high ambient temperature, aging of electrolyte and large pulse current caused by rapid
changing loads.
Criteria: Check if there is any leakage of liquids. Check if the safety valve protrudes. Measure static capacitance and
insulation resistance.
3.Relay
Possible cause of damages: corrosion, frequent-switching.
Criteria: Check whether the relay has open and shut failure.
