8-3
＊Judgment of life using maintenance data
The maintenance data of function codes H42 and H43 can be used to display data for the judgment of the
capacitance of the capacitor in the main circuit and the life of the cooling fan to obtain a measure for the
judgment of parts replacement. The capacitor life forecast signal is issued at the Y1 and Y2 terminals
according to the measured capacitance after the capacitance of the capacity reaches 85%.
(1) Measurement of capacitance of capacitor in main circuit
This inverter is provided with a function where the capacitance of the main circuit capacitor is
automatically measured upon shutoff of the inverter under certain conditions and it is displayed on
the keypad panel upon power-up.
The capacitance of the capacitor is displayed in the reduction ratio (% display) of the initial value
stored inside the inverter before shipment.
Procedure of measurement of capacitor capacitance
1. Remove the optional card from the inverter if it is mounted. Disconnect the braking unit or direct
current bus to another inverter from the P (+) and N (-) terminals of the main circuit if there is any.
The power factor improving reactor (DC reactor) may not be disconnected.
2. Turn the digital inputs (FWD, REV, X1-X5) at the control terminals off. Disconnect the RS 485
communication terminal if it is connected.
3. Turn the main power supply on. Check that the cooling fan rotates. Check that the inverter is
stopped. (The "OH2 external alarm" caused by deactivated digital input terminals does not cause a
problem.)
4. Turn the main power supply off.
5. After the charge lamp is unlit completely, turn the main power supply on again.
6. Monitor function code H42 to check the capacitor capacitance (%).
(2) Life of cooling fan
Function code H43 indicates the total operation time of the cooling fan. The time is integrated in units of
an hour and fractions shorter than an hour are ignored.
The actual life of the fan is largely effected by the temperature. Take the time as a measure.
Table 8-2-2 Measure for judgment of life based on maintenance data
Part Judgment level
Main circuit capacitor 85% or lower of the initial value
Cooling fan
30,000 hours (4.0 kW or less), 25,000 hours (5.5 kW
or more) *1
*1: Assumed life of cooling fan at ambient inverter temperature of 40 degree C.
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