Mitsubishi Electric FR-A700 Instruction Manual page 757

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
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 val-
ue 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 deteriora-
tion level of the capacitor capacity.
Check that the motor is connected and at a stop.
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
FR-A700 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
Cooling Fan Life
Limit Circuit Life
✔ ✔
✔ ✔
✔ ✔
✔ ✔
✔
—
✔
—
✔
—
✔
—
✔
—
✔
—
✔
—
✔
—
— —
— —
— —
— —
Inspection
Main Circuit Control Circuit
Capacitor Life Capacitor Life
✔ ✔
✔
—
✔
—
— —
✔ ✔
✔
—
✔
—
— —
✔ ✔
✔
—
✔
—
— —
✔ ✔
✔
—
✔
—
— —
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