Mitsubishi Electric FR-F740 EC Instruction Manual page 613

Maintenance and inspection
Pr. 255
(decimal)
15
14
13
12
11
10
Tab. 8-3: Displaying the end of service life by bits
✔: End of the service life is reached
—: End of the service life is not reached
NOTE Life check of the main circuit capacitor needs to be done by Pr. 259. (Refer to the following.)
Measuring method of life of the main circuit capacitor
If the value of capacitor capacity measured before shipment is considered as 100%, Pr. 255 bit 1
is turned on when the measured value falls below 85%.
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. 255, and check the
deterioration degree of the main circuit capacitor.
FR-F700 EC
Bits
(binary)
1111
1110
1101
1100
1011
1010
9 1001
8 1000
7 0111
6 0110
5 0101
4 0100
3 0011
2 0010
1 0001
0 0000
Inrush Current
Limit Circuit Life Cooling Fan Life
✔ ✔
✔ ✔
✔ ✔
✔ ✔
✔
—
✔
—
✔
—
✔
—
✔
—
✔
—
✔
—
✔
—
— —
— —
— —
— —
Inspection
Main Circuit Control Circuit
Capacitor Life Capacitor Life
✔ ✔
✔
—
✔
—
— —
✔ ✔
✔
—
✔
—
— —
✔ ✔
✔
—
✔
—
— —
✔ ✔
✔
—
✔
—
— —
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