MAINTENANCE
5-5
WARNING! The electric charge in the DC bus capacitor may be being charged even after the
power is turned off. Therefore, it may take a long time until the DC link circuit
voltage reaches a safety potential. Do not open the control circuit terminal block
cover within 5 minutes after the power has been turned off. Then remove the
control circuit and main circuit terminal block covers. Check that the DC link
circuit voltage between main circuit terminals P (+) and N (-) does not exceed the
safety voltage (+25 VDC) with a multimeter and 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 insulates tools.
- Never remodel
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 “Operating Environment.”
- Check that the LED monitor displays normally.
- Check for abnormal noise, odor, or excessive vibration.
- Check for traces of overheats discoloration and other defects.
Judgment of service life using maintenance information
Menu #5 “Maintenance information” in Programming mode can be used to display data for
the judgment of replacement of “DC bus capacitor,” “electrolytic capacitor on the printed circuit
board”and“cooling fan” as a guide.
If the replacement data is out of the judgment level for early warning, an early warning signal
is output to an external device through terminal (Y1) (function code E20). (When any replacement
data is out of the judgment level, terminal (Y1) outputs ON signal.)
Part Replacement Judgment with Menu #5 “Maintenance Information”
Table 5-1 Parts Replacement Judgment with Menu #5 “Maintenance Information”
DC bus capacitor
85% or lower of the capacitance than that of the factory
setting
Electrolytic capacitor on the printed circuit
board.
61,000 hours or longer as accumulated run time
Cooling fan
(Applicable motor rating: 1.5 to 3.7 kW).
61,000 hours or longer as accumulated run time (Assumed
life of cooling fan at ambient inverter temperature of 40ºC).
1. DC Bus Capacitor
Measure the capacitance of the DC bus capacitor as follows:
The capacitance is displayed in the reduction ratio (%) of the initial value written in the
inverter memory before shipment.
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