Revision April 2009, SW V1.00 8-1
Chapter 8 Maintenance and Inspections
Modern AC motor drives are based on solid state electronics technology. Preventive maintenance
is required to operate this AC motor drive in its optimal condition, and to ensure a long life. It is
recommended to have a check-up of the AC motor drive performed by a qualified technician.
Daily Inspection:
Basic check-up items to detect if there were any abnormalities during operation are:
1. Whether the motors are operating as expected.
2. Whether the installation environment is abnormal.
3. Whether the cooling system is operating as expected.
4. Whether any irregular vibration or sound occurred during operation.
5. Whether the motors are overheating during operation.
6. Always check the input voltage of the AC drive with a Voltmeter.
Periodic Inspection:
Before the check-up, always turn off the AC input power and remove the cover. Wait at least 10
minutes after all display lamps have gone out, and then confirm that the capacitors have fully
discharged by measuring the voltage between +1/+2 and -. The voltage between +1/+2 and -
should be less than 25VDC.
DANGER!
1. Disconnect AC power before processing!
2. Only qualified personnel can install, wire and maintain AC motor drives. Please take off any
metal objects, such as watches and rings, before operation. And only insulated tools are
allowed.
3. Never reassemble internal components or wiring.
4. Prevent electric shocks.
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