Maintenance And Inspection - Hitachi SJ7002 Series Instruction Manual

Maintenance and Inspection

Monthly and
Yearly Inspection
Chart
General Ambient
Main
circuits
Cooling
system
Control
circuit
Display LEDs
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Item Inspected 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
Heat sink Dust
General No odor,
discoloring,
corrosion
Capacitor No leaks or
deformation
Legibility
Inspection
Cycle
Inspection Method
Month Year
✔
Thermometer,
hygrometer
✔
Visual and aural
✔
Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
✔
Megger test
✔
Torque wrench
✔
Thermal trip events
✔
Visual
✔
Visual
✔
Visual
✔
Aural
✔
Visual
✔
Power down,
manually rotate
✔
Visual
✔
Visual
✔
Visual
✔
Visual
6–17
SJ700 Inverter
2
Criteria
Ambient temperature
between -10 to 50°C,
non-condensing
Stable environment for
electronic controls
200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
500VDC, reading of 5M
ohms or greater, see next
section for test details
M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
No trip events
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