Mitsubishi Electric FR-A700 Instruction Manual page 709

Parameter
Main circuit capacitor life display (Pr. 258, Pr. 259)
The deterioration degree of the main 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 sig-
nal.
Measure the capacitor capacity according to the following procedure and check the deteriora-
tion level of the capacitor capacity.
Check that the motor is connected and at a stop. Please also provide a separate mains
power supply for the inverter's control circuit (terminals L11 and L21).
Set "1" (measuring start) in Pr. 259.
Switch power off. The inverter applies DC voltage to the motor to measure the capacitor
capacity while the inverter is off.
After making sure that the power lamp is off, switch on the power supply again.
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
Tab. 6-180: Parameter 259
The life of the main circuit capacitor can not be measured in the following conditions:
³ The FR-HC, MT-HC, FR-CV, FR-BU, MT-BU5 or BU is connected.
· Terminals R1/L11, S1/L21 or DC power supply is connected to the terminal P/+ and N/−.
» Switch power on again during measuring.
¿ The motor is not connected to the inverter.
´ The motor is running. (The motor is coasting.)
² The motor capacity is two ranks (or more) smaller as compared to the inverter capacity.
¶ The inverter is at an alarm stop or an alarm occurred while power is off.
º The inverter output is shut off with the MRS signal.
¾ The start command is given while measuring.
Operating environment: Ambient Temperature (annual average 40°C (free from corrosive
FR-A700 EC
Description
0 No measurement
Measurement start
1
2 During measurement
3 Measurement complete
Forced end
8
(see , , ,
Measurement error
9
(see , , below)
gas, flammable gas, oil mist, dust and dirt))
Output current (80% of the rated current of Mitsubishi standard
4P motor)
below)
Useful functions
Remarks
Initial value
Measurement starts when the power supply is
switched off.
Only displayed and cannot be set
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