7.1 Daily Inspection
7-1
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 of 22 kW or below, or at least ten minutes for inverters of 33 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 running or the power is ON.
Check the following points.
• Check that the inverter provides the expected performance (as defined in the standard specifications).
• Check that the usage environment satisfies requirements listed in Chapter 1, Section 1.6.1.
• Check for abnormality in the keypad indication.
• Check for abnormal noise, excessive vibration, or odor.
• Check for traces of overheat, discoloration and other defects.
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