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Useful functions
4
PARAMETERS
(4) Main circuit capacitor life display (Pr.258, Pr.259)
The deterioration degree of the control circuit capacitor is displayed in Pr.258 as a life.
On the assumption that the main circuit capacitor capacitance at factory shipment is 100%, the capacitor life is displayed
in Pr.258 every time measurement is made.
When the measured value falls to or below 85%, Pr.255 bit 1 is turned ON and also an alarm is output to the Y90 signal.
Measure the capacitor capacity according to the following procedure and check the deterioration level of the capacitor
capacity.
1) Check that the motor is connected and at a stop.
2) Set "1" (measuring start) in Pr.259.
3) Switch power OFF. The drive unit applies DC voltage to the motor to measure the capacitor capacity when the drive unit
turns OFF.
4) After confirming that the LED of the operation panel is OFF, power ON again. (When using the 24V external power
supply, turn ON the power again after "EV" appears.)
5) Check that "3" (measuring completion) is set in Pr.259, read Pr.258, and check the deterioration degree of the main
circuit capacitor.
Pr.259 Description Remarks
0 No measurement Initial value
1 Measurement start
Measurement starts when the power supply is
switched OFF.
2 During measurement
Only displayed and cannot be set
3 Measurement complete
8 Forced end
9 Measurement error
REMARKS
When the main circuit capacitor life is measured under the following conditions, "forced end" (Pr.259 = "8") or "measuring error"
(Pr.259 ="9") occurs or it remains in "measuring start" (Pr.259 = "1"). Therefore, do not measure in such case. In addition, even
when "measurement completion" (Pr.259 = "3") is confirmed under the following conditions, normal measurement can not be
done.
(a) FR-HC2, FR-CV is connected.
(b) DC power supply is connected to the terminal P/+ and N/-.
(c) The power supply switched ON during measurement.
(d) The motor is not connected to the drive unit.
(e) The motor is running (coasting).
(f) The drive unit is tripped or a fault occurred when power is OFF.
(g) The drive unit output is shut off with the MRS signal and SON signal.
(h) The start command is given while measuring.
(i) The parameter unit (FR-PU07) is connected.
(j) Use terminal PC as power supply.
(k) I/O terminal of the control terminal block is ON (continuity).
(l) "EV" is displayed on the operation panel. (The main circuit power supply is OFF and the 24V external power supply is ON.)
(When FR-E7DS is mounted. Refer to page 316 )
Turning the power ON during measuring before LED of the operation panel turns OFF, it may remain in "measuring" (Pr.259 =
"2") status. In such case, carry out operation from step 2.
The motor shaft may move during measurement. Confirm in advance that the motor shaft movement will not cause any
problems.
POINT
For accurate life measurement of the main circuit capacitor, wait 3 hours or longer after turning OFF. The
temperature left in the main circuit capacitor affects measurement.
WARNING
When measuring the main circuit capacitor capacity (Pr.259 Main circuit capacitor life measuring = "1"), the DC
voltage is applied to the motor for 1s at powering OFF. Never touch the motor terminal, etc. right after
powering OFF to prevent an electric shock.