Routine maintenance involves:
z Whether the installation environment of the AC drive changes
z Whether the cooling fan works properly
z Whether abnormal vibration exists
z Whether the AC drive overheats
Routine cleaning involves:
z Keep the AC drive clean all the time.
z Remove the dust, especially metal powder on the surface of the AC drive, to prevent
the dust from entering the AC drive.
z Clear the oil stain on the cooling fan of the AC drive.
2.7.2 Periodic Inspection
Perform periodic inspection on the items that are difficult to check during running. Periodic
inspection involves:
z Check and clean the air filter periodically.
z Check whether the screws become loose.
z Check whether the AC drive is corroded.
z Check whether the wiring terminals have arc signs.
z Carry out the main circuit insulation test.
Before measuring the insulating resistance with megameter (500 VDC megameter recommended),
disconnect the main circuit from the AC drive. Do not use the insulating resistance meter to test the
insulation of the control circuit. The high voltage test need not be performed again because it has been
completed before delivery.
2.7.3 Replacement of Vulnerable Components
Vulnerable components of the AC drive include the cooling fan and filter electrolytic
capacitor. Their service life is related to the operating environment and maintenance.
The service life of the two components is listed in the following table.
Table 2-7 Service life of cooling fan and filter electrolytic capacitor
Part Service Life Possible Damage Cause Judging Criteria
Fan 2 to 3 years
z Bearing worn
z Blade aging
z Check whether there is crack on the
blade.
z Check whether there is abnormal
vibration noise upon startup.
Electrolytic
capacitor
4 to 5 years
z Input power supply in
poor quality
z High ambient
temperature
z Frequent load
jumping
z Electrolytic aging
z Check whether there is liquid
leakage.
z Check whether the safety valve has
projected.
z Measure the static capacitance.
z Measure the insulating resistance.
2.7.4 Storage of the AC Drive
For storage of the AC drive, pay attention to the following two aspects:
1. Pack the AC drive with the original packing box provided by Inovance.
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