Product Information VD520 Series Inverter User Manual
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2.9.1 Daily Round Check
Daily Inspection Projects
● If the heat from motor and the run inverter is higher than normal temperature
● If any abnormal noise or vibration from motor and the run inverter
● If current value of inverter loading current is as normal level
● If inverter cooling fan is run as normal, if it is stained with oil dirt and speed getting low.
● If the color of main control circuit terminal changed or rusted, if any arc discharge between input
and output phases.
● If the enclosure of inverter is overheat, if inverter inside is filled with dirt or metal powder, or oil dirt
on circuit board or conductive copper bar etc.
● If inverter is installed in cabinet, good ventilation is kept, cooling fan is run as normal.
2.9.2 Regular Maintenance
Regular maintenance item
● Clear inverter cooling air duct regularly, once the speed of cooling fan inside cabinet getting low
or stop, then replace it on time.
● Check if the connecting screws in main circuit and control circuit is loosed, any signs of overheat
on connecting copper bar inside inverter.
● Check if the insulation performance of motor and main circuit cable, any insulation damage of
main circuit and control circuit, especially the surface contacting with metal has cut.
● Non-professional staff or untrained operator cannot do maintenance or change device of the
inverter, failure to comply will result in personal hurt or damage the device.
● User is required to do insulation test on inverter. While testing insulation resistor of motor and
cable, make sure to disconnect inverter in advance. Otherwise the inverter can be damaged.
● If user insist to do insulation test on inverter, make sure all the input output terminal of main
circuit (L, N, R, S, T, U, V, W, P1, P+, PB, P-) are reliably grounded, use a 500V Meg Ohm Meter to
check.
● Do not use a 500V meg ohm meter to check on control circuit terminal, otherwise it can damage
inverter.
2.9.3 Inverter Wearing Part Replacement
Some device inside inverter can get wearing or aged after using for a certain period, in order to
ensure inverter operate reliably, it is necessary to do preventive maintenance, when necessary some
device need to be replaced.
The wearing part of inverter mainly as cooling fan, filtering big capacity electrolytic capacitor. Those
life is closely related with its applicant environment and maintain condition.
● In general condition the inverter cooling fan need to replace for every 2-3 years.
● In general condition the big capacity electrolytic capacitor of inverter need to replace for every
4-5 years.
2.9.4 Inverter Storage
If inverter has to be kept for some time or long time after purchasing, should pay attention to the
following:
