8
-2
Maintenance and Inspection
Daily Inspection
Check the following items with the system in operation.
•
The motor should not be vibrating or making unusual noises.
•
There should be no abnormal heat generation.
•
The ambient temperature should not be too high.
•
The output current value shown on the monitor displays should not be higher than normal.
•
The cooling fan on the bottom of the Inverter should be operating normally.
Periodic Inspection
Check the following items during periodic maintenance.
Always turn OFF the power supply before beginning inspection. Confirm that the LED indicators on the front
cover have all turned OFF and then wait until at least five minutes have elapsed before beginning the inspec-
tion. Be sure not to touch terminals right after the power has been turned off. Doing so can result in electric
shock.
Table 8.1 Periodic Inspections
Item
Inspection
Corrective Procedure
External terminals,
mounting bolts, connec-
tors, etc.
Are all screws and bolts tight?
Tighten loose screws and bolts firmly.
Are connectors tight?
Reconnect the loose connectors.
Cooling fins
Are the fins dirty or dusty?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2 x 10
4
to 58.8 x 10
4
Pa
(4 to 6 kg•cm
2
).
PCBs
Is there any conductive dirt or oil mist on
the PCBs?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2 x 10
4
to 58.8 x 10
4
Pa
(4 to 6 kg•cm
2
).
Replace the boards if they cannot be made clean.
Cooling fan
Is there any abnormal noise or vibration or
has the total operating time exceeded
20,000 hours?
Replace the cooling fan.
Power elements
Is there any conductive dirt or oil mist on
the elements?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2 x 10
4
to 58.8 x 10
4
Pa
(4 to 6 kg•cm
2
).
Smoothing capacitor
Are there any irregularities, such as dis-
coloration or odor?
Replace the capacitor or Inverter.
