Maintenance And Inspection; Monthly And Yearly Inspection Chart - Hitachi L300P Series Instruction Manual

6–10

Maintenance and Inspection

Maintenance and Inspection
Monthly and
Yearly Inspection
Chart
Item Inspected
Overall
Main
circuit
Control
circuit
Display LEDs
Check for...
Ambient Extreme
environment temperatures
& humidity
Major devices Abnormal
vibration,
noise
Power supply Voltage toler-
voltage ance
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
Curve" on 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
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
6–12.
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
"Capacitor Life