Maintenance And Inspection - Hitachi SJ7002 Series Instruction Manual

Maintenance and Inspection

Monthly and
Yearly Inspection
Chart
Item Inspected
General Ambient
environment
Major devices
Power supply
voltage
Main Ground
circuits Insulation
Mounting
Components
Housing
Terminal block
Smoothing
capacitor
Relay(s)
Resistors
Cooling Cooling fan
system
Heat sink
Control General
circuit
Capacitor
Display LEDs
Inspection
Cycle
Check for...
Month Year
✔
Extreme
temperatures
& humidity
✔
Abnormal
vibration,
noise
✔
Voltage
tolerance
✔
Adequate
resistance
✔
No loose
screws
✔
Overheating
✔
Dirt, dust
✔
Secure
connections
✔
Leaking,
swelling
✔
Chattering
✔
Cracks or
discoloring
✔
Noise
✔
Dust
✔
No odor,
discoloring,
corrosion
✔
No leaks or
deformation
✔
Legibility
SJ700
Inspection Method
Thermometer, Ambient temperature
hygrometer between -10 to 50°C,
non-condensing
Visual and aural Stable environment for
electronic controls
Digital volt meter, 200V class:
measure between 200 to 240V 50/60 Hz
inverter terminals 400V class:
[L1], [L2], [L3] 380 to 460V 50/60 Hz
Megger test 500VDC, reading of 5M
ohms or greater, see next
section for test details
Torque wrench M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
Thermal trip events No trip events
Visual Vacuum dust and dirt
Visual No abnormalities
Visual No abnormalities
Aural Single click when
switching ON or OFF
Visual Use Ohm meter to check
braking resistors
Power down, Rotation must be smooth
manually rotate
Visual Vacuum to clean
Visual No abnormalities
Visual Undistorted appearance
Visual All LED segments work
6–17
Inverter
2
Criteria