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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
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
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
(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 and plug-in option is ON (continuity).
(m)Plug-in option is fitted. (Only for the 0.75K or less)
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.
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.
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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