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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 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
DC bus capacitor
Electrolytic capacitor on the printed
circuit board
Cooling fan
(Applicable motor rating: 1.5 to 3.7 kW)
(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.
------------------------------------- Capacitance measurement procedure --------------------------------------
1)
Remove the RS485 communications card (option) from the inverter if it is mounted.
Disconnect the DC bus link circuit 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 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 bus capacitor.
-----------------------------------------------------------------------------------------------------------------------------------
Judgement level
85% or lower of the capacitance than that of the
factory setting
61,000 hours or longer as accumulated run time
61,000 hours or longer as accumulated run time
(Assumed life of cooling fan at ambient inverter
temperature of 40°C)
7-4
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