User Manual
Chapter 11 Maintenance and Inspection
11 - 2
11.2 Daily and Periodic Inspections
Item Inspected Check for…
Inspection
Cycle
Inspection
Method
Criteria
Daily Year
Overall
Ambient
environment
Extreme
temperatures &
humidity
Thermometer,
hygrometer
Ambient temperature between
–10 to 50C,
Humidity 90% or less
non-condensing
Major
devices
Abnormal noise &
vib.
Visual and aural Stable environment for electronic
controls
Power
supply
voltage
Voltage tolerance
Digital volt meter,
measure between
inverter terminals
[L1], [L2], [L3]
200V class: 50/60 Hz
200 to 240V (-15/+10%)
400V class: 50/60 Hz
380 to 480V (-15/+10%)
Main
circuit
Ground
Insulation
Adequate resistance
Refer to P6-16
5 M
or greater
Ground
terminal
No loose screws
Torque wrench M4: 0.8Nm
Components Overheating
Thermal trip events No trip events
Terminal
block
Secure connections
Visual No abnormalities
No loose screws
Torque wrench M3.5: 1.0Nm
M4: 1.5Nm
Smoothing
capacitors
Leaking, swelling
Visual No abnormalities
Relay(s) Chattering
Aural Single click when switching ON
or OFF
Resistors Cracks or discoloring
Visual Check Ohms of optional braking
res.
Control
circuit
Function Voltage balance
between phases
Measure voltage
between U,V,W
Difference must be 2% or less.
Protection circuit
e.g. Input Ex.trip
signal and check
inverter behavior
and alarm signal.
Functions properly.
Overall No odor, discoloring,
corrosion
Visual No abnormalities
Capacitor Leaking, swelling
Visual Undistorted appearance
Terminal No loose screws
Torque wrench M2: 0.2Nm
Cooling
Cooling fan Noise
Power down,
manually rotate
Rotation must be smooth
Dust
Visual Vacuum to clean
Mounting
Visual Mounted firmly
Heat sink Dust
Visual Vacuum to clean
Display
LEDs Legibility
Visual All LED segments work
Note 1: The life of a capacitor is affected by the ambient temperature. See “11.6”.
Note 2: Designed life of a cooling fan is.10 years. However, it is affected by the ambient
temperature and other environmental conditions.
Note 3: The inverter must be cleaned periodically. If dust accumulates on the fan and heat sink, it
can cause overheating of the inverter.
Note 4: Do not pull the cooling FAN’s wire, otherwise cooling FAN might cut the wires and cause
failure.