SJ700
2
Inverter
T
roub
leshooting
and Maintenance
6–17
Maintenance and Inspection
Monthly and
Yearly Inspection
Chart
Item Inspected
Check for...
Inspection
Cycle
Inspection Method
Criteria
Month
Year
General 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
tolerance
✔
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
circuits
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
system
Cooling fan
Noise
✔
Power down,
manually rotate
Rotation must be smooth
Heat sink
Dust
✔
Visual
Vacuum to clean
Control
circuit
General
No odor,
discoloring,
corrosion
✔
Visual
No abnormalities
Capacitor
No leaks or
deformation
✔
Visual
Undistorted appearance
Display
LEDs
Legibility
✔
Visual
All LED segments work