Amtech
8.2
8
8-1-2 Periodic Inspections
Inspection details and work
Appearance Check the state of dirt and dust on the vent or heatsink, and clean if
necessary.
Interior Check the state of dirt and dust on the PCB and inside the equipment, and
clean if necessary.
Terminal block Tighten the terminal block screws if loose.
Cooling fan Replace the fan every three years.
Electrolytic capacitor Confirm that there is no liquid leaking or sheath discoloration.
Insulation resistance
inspection
Do not perform a megger test on the AC DRIVE. When doing a megger test
on the external circuit, disconnect all wires connected to the AC DRIVE.
Encoder Confirm that there is no looseness or play in the bearings or couplings.
The bearings are durable parts. Life of bearing is approx. 10,000 hours at
6000rpm, and approx. 30,000 hours at 3000rpm.They must be replaced
periodically.
8-1-3 Inspection of spares
The inspection shown in above table must also be performed for spare AC DRIVEs that are left
connected but are not used in normal operation. The operation of the AC DRIVE must be checked
every six months by turning the power on.
8-2 Measuring devices
As the voltage and current on the input and output sides include high harmonics, the measured value
will differ according to the measuring device. When measuring with a device for commercial
frequencies, measure with the following circuits and noted measuring devices.
Input voltage: Moving iron type voltmeter or Rectifying voltmeter
Output voltage: Moving iron type voltmeter
Input / output power: Electrodynamometer type wattmeter
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