Chapter 8 - Troubleshooting & Maintenance
8-6
8.5.4 Maintenance and Inspection Scheduling
Inspection Location
Inspection
Item
Inspection
Every Inspection Method Criteria
Measuring
Instrument
Month
Year
Equipment Is there any abnormal vibration or
Ο
No special tools required No abnormality
Input
Voltage
Is the input voltage of the main circuit
normal?
Ο
Measure the voltage between the
terminals R, S and T.
Stable line
voltage within
operating range
of VFD
Digital
Multi-
Meter/Tester
Main Circuit
Power
Wiring
Is any conductor corroded or
overheated (discolored)?
Is the wire insulation damaged?
Ο
Ο
Visual check No fault
Internal
Power
Circuit
Is any bus bar corroded or overheated
(discolored)?
Is any DC bus capacitor damaged?
O
Visual check No fault
Terminals Is there any damage?
Ο
Visual check No fault
VFD
Cooling
Fan(s)
Is cooling fan spinning?
Is there any vibration or noise?
Ο
O
Turn OFF the power and turn the fan
by hand.
Fan must rotate
smoothly.
No fault
Motor
Insulation
Motor Winding Insulation Megger
check.
Ο
Disconnect Motor leads from VFD U,
V & W terminals and Megger each
motor lead to ground.
Over 5M
No fault
DC 500-
1000V class
Megger
8.5.5 Replacement Parts
Part name Period Comments
Cooling fan 2-3 years Replace with new fan
Keypad When failed Replace with new keypad
Control Board When failed Replace with new control PCB
Power Supply PCB When failed Replace with new SMPS PCB
The life expectancy of any part depends on environmental and operating conditions.
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