GE Industrial Solutions AF-300 P11 - Manual (Page 112)

8-3
Data subject to change without notice 7/07. © 2007 GE Drives
Note: If equipment is stained, wipe with a clean cloth. Use a vacuum to remove dust. *Estimate of life expectancy based
on maintenance information.
The maintenance information is stored in the drive keypad panel. It indicates the electrostatic capacitance of the main
circuit capacitors and the life expectancy of the electrolytic capacitors on the control PC board and the cooling fans. Use
this data as the basis to estimate the life expectancy of parts.
1) Determining the capacitance of the main circuit capacitors
This drive is equipped with a function to automatically indicate the capacitance of the capacitors installed in the main
circuit when powering up the drive after disconnecting the power according to the prescribed conditions.
The initial capacitance values are set in the drive when shipped from the factory, and the decrease ratio (%) to those
values can be displayed.
Use this function as follows:
(1) Remove any option boards from the inverter. Disconnect the DC bus connections to the main circuit [Terminals
P(+) and N(-)] from the braking unit or other inverters, if connected. The power factor correcting reactor (DC
reactor) does not need be disconnected.
A power supply introduced to the auxiliary input [Terminals R0, T0] that provides control power should
be isolated.
(2) Disable all the digital inputs (FWD, REV, X1-X9) on the control terminals. Also disconnect RS485 serial
communication, if used.
Turn on the main power supply. Confirm that the cooling fan is rotating and that the inverter is not operating.
(There is no problem if the “OH2 External thermal relay tripped” function is activated by the digital input terminal.)
(3) Turn the main power off.
(4) Turn on the main power again after verifying that the charge lamp is completely off.
(5) Open the maintenance information on the keypad panel and confirm the capacitance values of the
built-in capacitors.
2) Life expectancy of the PC control board
The actual capacitance of a capacitor is not measured in this case. However, the integrated operating hours for the
control power supply, multiplied by the life expectancy coefficient as defined by the temperature inside the inverter,
will be displayed. Hence, the hours displayed may not agree with the actual operating hours, depending on the
operational environment.
Since the integrated hours are counted in unit hours, power input for less than one hour will be disregarded.
3) Life expectancy of cooling fan
The integrated operating hours of the cooling fan are displayed. Since the integrated hours are counted in unit hours,
power input for less than one hour will be disregarded.
The displayed value should be considered a rough estimate because the actual life of a cooling fan is influenced
significantly by the temperature.
Table 8..-2 Rough estimate of life expectancy using maintenance information
Parts Recommended Level
Capacitor in main circuit 85% or less of the initial value
Electrolytic capacitor on control PC board 61,000 hours
Cooling fan 40,000 hours (5 Hp or less), 25,000 hours (Over 7.5 Hp)*
* Estimated life expectancy of a ventilation-fan at inverter ambient temperature of 40°C