Omron MX2 - Maintenance and Inspection; Daily and Yearly Inspection Chart

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Maintenance and Inspection Section 6-4
6-4 Maintenance and Inspection
6-4-1 Daily and Yearly Inspection Chart
Note 1 The life of a capacitor is affected by the ambient temperature. See page 252.
Note 2 Designed life of a cooling fan is.10 years. However, it is affected by the ambi-
ent 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.
Item Inspected Check for... Inspection
Cycle
Inspection Method Criteria
Daily Year
Overall Ambient
environment
Extreme tempera-
tures & humidity
✓ Thermometer,
hygrometer
Ambient temperature between
-10 to 50°C, 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]
200 V class: 50/60 Hz
200 to 240 V (-15/+10%)
400 V class: 50/60 Hz
380 to 460 V (-15/+10%)
Main
circuit
Ground
Insulation
Adequate
resistance
✓ Refer to P6-16 5 MΩ or greater
Mounting No loose screws ✓ Torque wrench M3.5: 1.0 Nm
M4: 1.4 Nm
M5: 3.0
M6: 3.9 to 5.1 Nm
M8: 5.9 to 8.8 Nm
Components Overheating ✓ Thermal trip events No trip events
IGBT Resistance value ✓ Refer to P6-17
Terminal block Secure connections ✓ Visual No abnormalities
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, discolor-
ing, corrosion
✓ Visual No abnormalities
Capacitor Leaking, swelling ✓ Visual Undistorted appearance
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