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Inspection items
(2) Measuring method of life of the main circuit capacitor
If the value of capacitor capacity measured before shipment is considered as 100%, Pr. 255 bit1 is turned ON when the
measured value falls below 85%.
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 inverter applies DC voltage to the motor to measure the capacitor capacity while the inverter
is OFF.
4) After confirming that the LED of the operation panel is OFF, power ON again.
5) Check that "3" (measuring completion) is set in Pr. 259 then read Pr. 258 and check the life of the main circuit
capacitor.
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-HC or FR-CV is connected.
(b)DC power supply is connected to terminal P/+ and N/-.
(c)Switch power ON during measuring.
(d)The motor is not connected to the inverter.
(e)The motor is running (coasting).
(f)The motor capacity is two rank smaller as compared to the inverter capacity.
(g)The inverter is at an alarm stop or an alarm occurred while power is OFF.
(h)The inverter output is shut off with the MRS signal.
(i) The start command is given while measuring.
(j) The parameter unit (FR-PU04/FR-PU07) is connected.
(k)Using terminal PC as power supply.
(l)I/O terminal of the control terminal block is ON (continuity).
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.
POINT
For the accurate life measuring of the main circuit capacitor, perform after more than 3 hours passed since the
turn OFF of the power as it is affected by the capacitor temperature.
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.
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