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Maintenance and Inspection
Daily and Yearly Inspection Chart
Item Inspected
Ambient
environment
Major
Overall
devices
Power
supply
voltage
Ground
Insulation
Mounting
Main
Components
circuit
IGBT
Terminal
block
Smoothing
capacitors
Relay(s)
Resistors
Function
Control
circuit
Overall
Capacitor
Cooling
Cooling fan
Heat sink
Display
LEDs
Inspection
Check for...
Cycle
Daily
Extreme
temperatures &
humidity
Abnormal noise
& vib.
Voltage tolerance
Adequate
resistance
No loose screws
Overheating
Resistance value
Secure
connections
Leaking, swelling
Chattering
Cracks or
discoloring
Voltage balance
between phases
Protection circuit
No odor,
discoloring,
corrosion
Leaking, swelling
Noise
Dust
Mounting
Dust
Legibility
Inspection
Method
Year
Thermometer,
hygrometer
Visual and aural
Digital volt meter,
measure
between inverter
terminals [L1],
[L2], [L3]
Torque wrench
Thermal trip
events
Visual
Visual
Aural
Visual
Measure voltage
between U,V,W
e.g. Input Ex.trip
signal and check
inverter behavior
and alarm signal.
Visual
Visual
Power down,
manually rotate
Visual
Visual
Visual
Visual
Ii
Criteria
Ambient temperature
between –
Humidity 90% or less
non-condensing
Stable environment for
electronic controls
200V class: 50/60 Hz
200 to 240V (-15/+10%)
400V class: 50/60 Hz
380 to 460V (-15/+10%)
5 Mohm or greater
M3.5: 1.0Nm M4: 1.4Nm
M5: 3.0 M6: 3.9 to
5.1Nm M8: 5.9 to 8.8Nm
No trip events
No abnormalities
No abnormalities
Single click when
switching ON or OFF
Check Ohms of optional
braking res.
Difference must be 2%
or less.
Functions properly.
No abnormalities
Undistorted appearance
Rotation must be
smooth
Vacuum to clean
Mounted firmly
Vacuum to clean
All LED segments work
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