Yaskawa Varispeed-656 DC5 - Manual (Page 50)

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5.2 Daily Inspection
Check the following items with the system in operation.
• There should be no abnormal heat generation.
• The ambient temperature should not be too high.
• The cooling fan on the VS-656DC5 should be operating normally.
5.3 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 at least five minutes have
elapsed before beginning the inspection. Be sure not to touch terminals right after the power
has been turned OFF. Doing so may result in an electric shock.
Table 10 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.
Radiation Fin (Heatsink) 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
×
10 4 to 58.8 × 10 4 Pa (4 to 6 kgxcm 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 kgxcm 2 ).
Replace the boards if they cannot be
made clean.
Cooling fan Is there any abnormal noise or vibra-
tion or has the total operating time
exceeded 20,000 hours? Replace the cooling fan.
Power elements Is there any dirt or dust on the ele-
ments? 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 kgxcm 2 ).
Smoothing capacitor Are there any irregularities, such as
discoloration or odor? Replace the capacitor or VS-656DC5.