7-1
Chapter 7 MAINTENANCE AND INSPECTION
Perform daily and periodic inspection to avoid trouble and keep reliable operation for a long time.
Take care of the following items during work.
• Before starting inspection and maintenance, first turn off the inverter and wait at least 5
minutes. This is because the electric charge in the DC link bus capacitor may remain even
after the power is turned off and it may take time until the DC link bus voltage drops below a
safe potential. After 5 minutes or more, remove the control circuit and main circuit terminal
block covers. Make sure that the DC link bus voltage between the terminals P (+) and N (-)
has dropped below the safe voltage level (+25 VDC), using a multimeter and then start the
maintenance and inspection.
Electric shock may occur.
• Maintenance, inspection, and parts replacement should be made only by authorized persons.
• Take off the watch, rings and other metallic matter before starting work.
• Use insulated tools.
• Never modify the inverter.
Electric shock or injuries could occur.
7.1 Daily Inspection
Visually inspect errors in the state of operation from the outside without removing the covers while
the inverter operates or while it is turned on.
- Check if the expected performance (satisfying the standard specification) is obtained.
- Check if the surrounding environment satisfies Chapter 2, Section 2.1 "Operating Environment."
- Check that the LED monitor 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 inspection by following the items of the list of periodic inspection in Table 7.1.
Before performing periodic inspection, be sure to stop the motor, turn off the inverter, and shut down
power supply. Then remove the covers of the control and main circuit terminal blocks.
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