Maintenance And Inspection - Hitachi L100 Instruction Manual

Maintenance and Inspection

Monthly and Yearly Inspection Chart
Item Inspected
Overall Ambient
Main
circuit
Control
circuit
Display LEDs
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Check for...
Extreme
environment temperatures
& humidity
Major devices Abnormal
vibration,
noise
Power supply Voltage
voltage tolerance
Ground Adequate
Insulation resistance
Mounting No loose
screws
Components Overheating
Housing Dirt, dust
Terminal block Secure
connections
Smoothing Leaking,
capacitor swelling
Relay(s) Chattering
Resistors Cracks or
discoloring
Cooling fan Noise
Dust
Overall No odor,
discoloring,
corrosion
Capacitor No leaks or
deformation
Legibility
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.
Inspection
Inspection
Cycle
Method
Month Year
Thermometer,
hygrometer
Visual and aural
Digital volt meter,
measure between
inverter terminals
L1, L2, L3
Digital volt meter,
GND to terminals
Torque wrench
Thermal trip events No trip events
Visual
Visual
Visual
Aural
Visual
Power down,
manually rotate
Visual
Visual
Visual
Visual
6–9
L100 Inverter
Criteria
Ambient temperature
between -10 to 40°C,
non-condensing
Stable environment for
electronic controls
200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
5 Meg. Ohms or greater
M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
Vacuum dust and dirt
No abnormalities
No abnormalities
Single click when
switching On or Off
Use Ohm meter to
check braking resistors
Rotation must be
smooth
Vacuum to clean
No abnormalities
Undistorted appearance
All LED segments work