Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 169)

PC NC Maintenance Manual The VS-626M5
4-148
Periodic Inspection
The VS-626M5 and the VS-656MR5 function longer if they are kept clean,
cool and dry, while observing the precautions listed in
Par. 2.1 . Check for
tightness of electrical connections, discoloration, or other signs of over-
heating or aging. Use the table below
as your inspection guide. Before ser-
vicing, turn OFF the AC main circuit power and ensure that the CHARGE
LED and 7-segment LED are OFF.
Table 4.34: Periodic Inspection
Component Check Corrective Action
Inverter/
Converter External Terminals,
Unit Mounting Bolts,
Connectors, etc. Loose screws Tighten.
Loose connectors Tighten.
Heat Sink Build-up of dust and dirt Blow with dry compressed air of
39.2_10
4
to 58.8_10
4
Pa (4 to
6kg_cm
2
) pressure.
Printed Circuit Board Accumulation of conductive
dust or oil
Blow with dry compressed air of
39.2_10
4
to 58.8_10
4
Pa (4 to
6kg_cm
2
) pressure. If dust and oil
cannot be removed, replace the
board.
Cooling Fan For abnormal noise and vibra-
tion
Whether the cumulative opera-
tion time exceeds 20,000
hours or not. Replace the cooling fan.
Power Elements Accumulation of dust and dirt Blow with dry compressed air of
39.2_10
4
to 58.8_10
4
Pa (4 to
6kg_cm
2
) pressure.
Smoothing
Capacitor Discoloration or odor Replace the capacitor or converter
unit.
Related to
Bearing Bearing Noise Abnormal noise or increase of
noise level Replace the bearing.
Vibration Abnormal vibration
Bearing
Temperature Abnormal temperature rise
Grease No leakage Remove the cause to recover.
Motor
Cooling
Fan Operation Status Normal operation Remove the cause of fan halt or
replace the fan if a fault is found.