Yaskawa G7 Drive - Manual (Page 411)

8
-2
Maintenance and Inspection
‹ Outline of Maintenance
The maintenance period of the Drive is as follows:
Maintenance Period: Within 18 months of shipping from the factory or within 12 months of being delivered to
the final user, whichever comes first.
‹ 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 Drive 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 LCD and LED indicators on
the front cover have all turned OFF, and then wait until at least five minutes has elapsed before beginning the
inspection. 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 Drive.