7-1
Chap. 7 MAINTENANCE AND INSPECTION
Chapter 7 MAINTENANCE AND INSPECTION
Perform daily and periodic inspections to avoid trouble and keep reliable operation of the inverter for a long time. When
performing inspections, follow the instructions given in this chapter.
• Before proceeding to the maintenance/inspection jobs, turn OFF the power and wait at least five minutes for
inverters with a capacity of 22 kW or below, or at least ten minutes for inverters with a capacity of 30 kW or
above. Make sure that the LED monitor and charging lamp are turned OFF. Further, make sure, using a multimeter or a
similar instrument, that the DC link bus voltage between the terminals P(+) and N(-) has dropped to the safe level (+25
VDC or below).
Electric shock may occur.
• Maintenance, inspection, and parts replacement should be made only by authorized persons.
• Take off the watch, rings and other metallic objects before starting work.
• Use insulated tools.
• Never modify the inverter.
Electric shock or injuries could occur.
7.1 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 specification) is obtained.
- Check that the surrounding environment satisfies the requirements given in Chapter 2, Section 2.1 "Operating Environment."
- Check that the LED monitor on the keypad displays normally.
- Check for abnormal noise, odor, or excessive vibration.
- Check for traces of overheat, discoloration and other defects.
7.2 Periodic Inspection
Perform periodic inspections according to the items listed in Table 7.1. Before performing periodic inspections, be sure to stop
the motor and remove the front cover with the inverter power OFF.
Table 7.1 List of Periodic Inspections
Check part Check item How to inspect Evaluation criteria
Environment
1) Check the surrounding 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
Common
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
Main circuit
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
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