Hitachi WJ200 Series

6−15
Maintenance and Inspection
Daily and Yearly Inspection Chart
Item Inspected Check for…
Inspection
Cycle
Inspection
Method
Criteria
Daily Year
Overall
Ambient
environment
Extreme
temperatures &
humidity
9
Thermometer,
hygrometer
Ambient temperature
between –10 to 50°C,
Humidity 90% or less
non-condensing
Major
devices
Abnormal noise &
vib.
9
Visual and aural Stable environment for
electronic controls
Power
supply
voltage
Voltage tolerance
9
Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
200V class: 50/60 Hz
200 to 240V (-15/+10%)
400V class: 50/60 Hz
380 to 460V (-15/+10%)
Main
circuit
Ground
Insulation
Adequate
resistance
9
Refer to P6-16
5 MΩ or greater
Mounting No loose screws
9
Torque wrench M3.5: 1.0Nm
M4: 1.4Nm
M5: 3.0
M6: 3.9 to 5.1Nm
M8: 5.9 to 8.8Nm
Components Overheating
9
Thermal trip
events
No trip events
IGBT Resistance value
9
Refer to P6-17
Terminal
block
Secure connections
9
Visual No abnormalities
Smoothing
capacitors
Leaking, swelling
9
Visual No abnormalities
Relay(s) Chattering
9
Aural Single click when
switching ON or OFF
Resistors Cracks or
discoloring
9
Visual Check Ohms of optional
braking res.
Control
circuit
Function Voltage balance
between phases
9
Measure voltage
between U,V,W
Difference must be 2%
or less.
Protection circuit
9
e.g. Input Ex.trip
signal and check
inverter behavior
and alarm signal.
Functions properly.
Overall No odor,
discoloring,
corrosion
9
Visual No abnormalities
Capacitor Leaking, swelling
9
Visual Undistorted appearance
Cooling
Cooling fan Noise
9
Power down,
manually rotate
Rotation must be
smooth
Dust
9
Visual Vacuum to clean
Mounting
9
Visual Mounted firmly
Heat sink Dust
9
Visual Vacuum to clean
Display
LEDs Legibility Visual All LED segments work
Note 1: The life of a capacitor is affected by the ambient temperature. See page 6–21.
Note 2: Designed life of a cooling fan is.10 years. However, it is affected by the ambient
temperature and other environmental conditions.
Note 3: The inverter must be cleaned periodically. If dust accumulates on the fan and
heat sink, it can cause overheating of the inverter.