Mitsubishi Electric FR-A820-00046 Instruction Manual page 434

(E) Environment setting parameters
Life display of the control circuit capacitor (Pr. 257)
● The deterioration degree of the control circuit capacitor is displayed in Pr. 257.
● In the operating status, the control circuit capacitor life is calculated from the energization time
and temperature, and is counted down from 100%. As soon as the control circuit capacitor life
falls below 10%, Pr. 255 bit 0 is turned ON and also a warning is output to the Y90 signal.
Life display of the main circuit capacitor (Pr. 258, Pr. 259)
(Standard models and IP55 compatible models)
NOTE For accurate life measurement of the main circuit capacitor, wait three hours or longer after turn-
ing OFF. The temperature left in the main circuit capacitor affects measurement.
● The deterioration degree of the main circuit capacitor is displayed in Pr. 258.
● With the main circuit capacitor capacity at factory shipment as 100%, the capacitor life is displayed
in Pr. 258 every time measurement is made. When the measured value falls to 85% or lower, Pr. 255
bit 1 is turned ON and also a warning is output to the Y90 signal.
● Measure the capacitor capacity according to the following procedure and check the deterioration
degree of the capacitor capacity.
Check that the motor is connected and at a stop.
Set "1" (measuring start) in Pr. 259.
Switch the power OFF. The inverter applies DC voltage to the motor to measure the capacitor
capacity while the inverter is OFF.
After confirming that the power lamp is OFF, turn ON the power again.
Check that "3" (measurement complete) is set in Pr. 259, read Pr. 258, and check the deteriora-
tion degree of the main circuit capacitor.
Pr. 259
0
1
2
3
8
9
Tab. 5-93:
5 - 232
Description
No measurement
Measurement start
During measurement
Measurement complete
Forced end
Measurement error
Parameter 259
Remarks
Initial value
Measurement starts when the power supply is
switched OFF
Only displayed and cannot be set
Parameters