Hitachi SJ300-037HFE Manual De Usuario
Maintenance and Inspection
T
roub
leshooting
and Maintenance
6–10
Maintenance and Inspection
Monthly and
Yearly Inspection
Chart
Yearly Inspection
Chart
.
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
Year
Overall
Ambient
environment
environment
Extreme
temperatures
& humidity
temperatures
& humidity
✔
Thermometer,
hygrometer
hygrometer
Ambient temperature
between -10 to 50°C,
non-condensing
between -10 to 50°C,
non-condensing
Major devices
Abnormal
vibration,
noise
vibration,
noise
✔
Visual and aural
Stable environment for
electronic controls
electronic controls
Power supply
voltage
voltage
Voltage toler-
ance
ance
✔
Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
measure between
inverter terminals
[L1], [L2], [L3]
200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
Main
circuit
circuit
Ground
Insulation
Insulation
Adequate
resistance
resistance
✔
Megger test
500VDC, reading of 5M
ohms or greater, see next
section for test details
ohms or greater, see next
section for test details
Mounting
No loose
screws
screws
✔
Torque wrench
M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 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
connections
✔
Visual
No abnormalities
Smoothing
capacitor
capacitor
Leaking,
swelling
swelling
✔
Visual
No abnormalities
Relay(s)
Chattering
✔
Aural
Single click when
switching ON or OFF
switching ON or OFF
Resistors
Cracks or
discoloring
discoloring
✔
Visual
Use Ohm meter to check
braking resistors
braking resistors
Cooling fan
Noise
✔
Power down,
manually rotate
manually rotate
Rotation must be smooth
Dust
✔
Visual
Vacuum to clean
Control
circuit
circuit
Overall
No odor,
discoloring,
corrosion
discoloring,
corrosion
✔
Visual
No abnormalities
Capacitor
No leaks or
deformation
deformation
✔
Visual
Undistorted appearance
Display
LEDs
Legibility
✔
Visual
All LED segments work