L100 Inverter
Troubleshooting
and Maintenance
6–9

Maintenance and Inspection

Monthly and Yearly Inspection Chart

Note 1: The life of a capacitor is affected by the ambient temperature. See the Capacitor Life Curve on
the next page.
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 Yea r
Overall Ambient
environment Extreme
temperatures
& humidity
✔Thermometer,
hygrometer Ambient temperature
between -10 to 40°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
circuit Ground
Insulation Adequate
resistance ✔Digital volt meter,
GND to terminals 5 Meg. Ohms or greater
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
Technologies Inc.
Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com