Maintenance And Inspection - Hitachi CONVENTION 14 Instruction Manual

Maintenance and Inspection

Monthly and Yearly Inspection Chart
Item Inspected
Ambient
environment
Major devices
Overall
Power supply
voltage
Ground
Insulation
Mounting
Components
Housing
Terminal block Secure
Main
circuit
Smoothing
capacitors
Relay(s)
Resistors
Cooling fan
Overall
Control
circuit
Capacitor
Display LEDs
Note 1: The life of a capacitor is affected by the ambient temperature. See
Life 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
Check for... Cycle
Month
Extreme
temperatures
& humidity
Abnormal
noise & vib.
Voltage
tolerance
Adequate
resistance
No loose
screws
Overheating
Dirt, dust
connections
Leaking,
swelling
Chattering
Cracks or
discoloring
Noise
Dust
No odor,
discoloring,
corrosion
No leaks or
deformation
Legibility
6–11.
Inspection
Method
Year
Thermometer,
hygrometer
Visual and aural
Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
Digital volt meter,
GND to terminals
Torque wrench
Thermal trip
events
Visual
Visual
Visual
Aural
Visual
Power down,
manually rotate
Visual
Visual
Visual
Visual
6 − 9
6 9
Criteria
Ambient temperature
between – 10 to 40 C,
non-condensing
Stable environment for
electronic controls
200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
5 M or greater
M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
No trip events
No abnormalities
No abnormalities
No abnormalities
Single click when
switching ON or OFF
Check Ohms of optional
braking res.
Rotation must be
smooth
Vacuum to clean
No abnormalities
Undistorted appearance
All LED segments work
"Capacitor