Yaskawa Matrix Converter - Manual (Page 349)

8
-2
Maintenance and Inspection
‹ Limited Warranty
This product is warranted for twelve months after delivery to the customer or for up to eighteen months from
the date of shipment, whichever comes first.
‹ Daily Inspection
Check the following items after the MxC has been installed.
• The motor should not vibrate or make unusual noise.
• There should be no abnormal heat generation.
• The ambient temperature should not be too high.
• The output current value shown on the monitor display should not be higher than normal.
• The cooling fan of the MxC 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 been turned off, and then wait until at least five minutes has elapsed before inspecting
the MxC. Be sure not to touch terminals right after the power has been turned off. Doing so can result in elec-
tric shock.
Table 8.1 Periodic Inspections
Item Inspection Corrective Procedure
External terminals,
mounting bolts,
connectors, etc. Are all screws and bolts tight? Firmly tighten loose screws and bolts.
Are connectors tight? Re-affix any loose connectors.
Heatsink Is the heatsink dirty or full of dust?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2
× 10 4 to 58.8 × 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
× 10 4 to 58.8 × 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 oscillation?
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 power components?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2
× 10 4
to 58.8 × 10 4
Pa
(4 to 6 kg•cm 2 ).