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Maintenance and Inspection
Troubleshooting
and Maintenance
6–10
Maintenance and Inspection
Monthly and
Yearly Inspection
Chart
Note 1: The life of a capacitor is affected by the ambient temperature. See “Capacitor Life
Curve” on page 6–12.
Note 2: The inverter must be cleaned periodically. If dust accumulates on the fan and heat
sink, it can cause overheating of the inverter.
Item Inspected Check for...
Inspection
Cycle
Inspection Method Criteria
Month Ye ar
Overall Ambient
environment
Extreme
temperatures
& humidity
✔ Thermometer,
hygrometer
Ambient temperature
between -10 to 50°C,
non-condensing
Major devices Abnormal
vibration,
noise
✔ Visual and aural Stable environment for
electronic controls
Power supply
voltage
Voltage toler-
ance
✔ Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
Main
circuit
Ground
Insulation
Adequate
resistance
✔ Megger test 500VDC, reading of 5M
ohms or greater, see next
section for test details
Mounting No loose
screws
✔ Torque wrench M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
Components Overheating ✔ Thermal trip events No trip events
Housing Dirt, dust ✔ Visual Vacuum dust and dirt
Terminal block Secure
connections
✔ Visual No abnormalities
Smoothing
capacitor
Leaking,
swelling
✔ Visual No abnormalities
Relay(s) Chattering ✔ Aural Single click when
switching ON or OFF
Resistors Cracks or
discoloring
✔ Visual Use Ohm meter to check
braking resistors
Cooling fan Noise ✔ Power down,
manually rotate
Rotation must be smooth
Dust ✔ Visual Vacuum to clean
Control
circuit
Overall No odor,
discoloring,
corrosion
✔ Visual No abnormalities
Capacitor No leaks or
deformation
✔ Visual Undistorted appearance
Display LEDs Legibility ✔ Visual All LED segments work