B&C Technologies DI-325 Industrial - Manual (Page 30)

ROUTINE MAINTENANCE
6-3
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.
- Uses insulate 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.
- Checks for traces of overheat 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.)
Table 6-1 Parts Replacement Judgment with Menu #5 “Maintenance Information”
Parts to be replaced Judgment level
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).