6-1
Chapter 6 MAINTENANCE AND INSPECTION
Perform daily and periodic inspections to avoid trouble and keep reliable operation of the inverter for a long time.
6.1 Daily Inspection
Visually inspect the inverter for operation errors from the outside without removing the covers when the inverter
is ON or operating.
- Check that the expected performance (satisfying the standard specifications) is obtained.
- Check that the surrounding environment satisfies the environmental requirements given in Chapter 7, Section
7.1 "Standard Model."
- Check that the keypad displays normally.
- Check for abnormal noise, odor, or excessive vibration.
- Check for traces of overheat, discoloration and other defects.
6.2 Periodic Inspection
Before starting periodic inspections, be sure to stop the motor, shut down the power, and wait at least 10 minutes.
Make sure that the charging lamp is turned OFF. Further, make sure, using a multimeter or a similar instrument,
that the DC link bus voltage between the main circuit terminals P(+) and N(-) has dropped to the safe level (+25
VDC or below).
Table 6.1 List of Periodic Inspections
Check part
Check item
How to inspect
Evaluation criteria
Environment
1) Check the ambient temperature,
humidity, vibration and atmosphere
(dust, gas, oil mist, or water drops).
2) Check that tools or other foreign
materials or dangerous objects are
not left around the equipment.
1) Check visually or
measure using
apparatus.
2) Visual inspection
1) The standard
specifications must be
satisfied.
2) No foreign or dangerous
objects are left.
Input voltage
Check that the input voltages of the
main and control circuit are correct.
Measure the input
voltages using a
multimeter or the like.
The standard specifications
must be satisfied.
Keypad
1) Check that the display is clear.
2) Check that there is no missing part
in the displayed characters.
1), 2)
Visual inspection
1), 2)
The display can be read
and there is no fault.
Structure such
as frame and
cover
Check for:
1) Abnormal noise or excessive
vibration
2) Loose bolts (at clamp sections).
3) Deformation and breakage
4) Discoloration caused by overheat
5) Contamination and accumulation of
dust or dirt
1) Visual or auditory
inspection
2) Retighten.
3), 4), 5)
Visual inspection
1), 2), 3), 4), 5)
No abnormalities
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1) Check that bolts and screws are
tight and not missing.
2) Check the devices and insulators
for deformation, cracks, breakage
and discoloration caused by
overheat or deterioration.
3) Check for contamination or
accumulation of dust or dirt.
1) Retighten.
2), 3)
Visual inspection
1), 2), 3)
No abnormalities
Conductors
and wires
1) Check conductors for
discoloration and distortion
caused by overheat.
2) Check the sheath of the wires for
cracks and discoloration.
1), 2)
Visual inspection
1), 2)
No abnormalities
