7-4
Judgement of service life using maintenance information
Menu #5 "Maintenance information" in Programming mode can be used to display data for the
judgement of replacement of "DC link bus capacitor," "electrolytic capacitor on the printed circuit
board," and "cooling fan" as a guide.
If the replacement data is out of the judgement 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 judgement level, terminal [Y1] outputs ON signal.)
Table 7.2 Parts Replacement Judgement with Menu #5 "Maintenance Information"
Parts to be replaced Judgement level
DC link 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
(Nominal applied motor: 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 40°C)
(1) DC link bus capacitor
Measure the capacitance of the DC link bus capacitor as follows:
The capacitance is displayed in the reduction ratio (%) of the initial value written in the inverter
memory before shipment.
------------------------------------- Capacitance measurement procedure --------------------------------------
1) Remove the RS-485 communications card (option) from the inverter if it is mounted. Disconnect
the DC link bus to other inverters from terminals P (+) and N (-) of the main circuit if any. A DC
reactor (option) and braking resistor (option) may not be disconnected. Keep the ambient
temperature at 25 ±10°C.
2) Turn off the digital inputs (FWD, REV, and X1 to X3) at the control terminals.
- If an external potentiometer is connected, to terminal [13], remove it.
- Set the data of function codes E20 and E27 as the transistor output [Y1] or relay output [30A,
B, C] does not come on while the inverter power is turned off. E.g., recommended settings
are to assign normal logic signal RUN and ALM to terminals [Y1] and [30A, B, C]
respectively.
3) Turn the inverter power on.
4) Check that the cooling fan rotates and the inverter is on halt.
5) Turn the main power supply off. Start measuring the capacitance of the DC link bus capacitor.
6) After the LED monitor is unlit completely, turn the main power supply on again.
7) Select Menu #5 "Maintenance information" in Programming mode, and check the reduction ratio
(%) of the capacitance of the DC link bus capacitor.
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