Mitsubishi Electric FR-A720-0.4K Instruction Manual page 377

⋅ The life alarm signal (Y90) turns on when any of the control circuit capacitor, main circuit capacitor, cooling fan and
inrush current limit circuit reaches the life alarm output level.
⋅ For the terminal used for the Y90 signal, set "90" (positive logic) or "190" (negative logic) to any of Pr. 190 to Pr. 196
(output terminal function selection).
REMARKS
⋅ The digital output option (FR-A7AY) allows the control circuit capacitor life signal (Y86), main circuit capacitor life signal (Y87),
cooling fan life signal (Y88) and inrush current limit circuit life signal (Y89) to be output individually.
CAUTION
⋅ When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions may be
affected. Please make setting after confirming the function of each terminal.
(2) Life display of the inrush current limit circuit (Pr. 256)
⋅ The life of the inrush current limit circuit (relay, contactor and inrush resistor) is displayed in Pr. 259.
⋅ The number of contact (relay, contactor, thyristor) ON times is counted, and it is counted down from 100% (1 million
times) every 1%/10,000 times. As soon as 10% (900,000 times) is reached, Pr. 255 bit 3 is turned on and also an
alarm is output to the Y90 signal.
(3) Control circuit capacitor life display (Pr. 257)
⋅ The deterioration degree of the control circuit capacitor is displayed in Pr. 257 as a life.
⋅ In the operating status, the control circuit capacitor life is calculated from the energization time and temperature,
and is counted down from 100%. As soon as the control circuit capacitor life falls below 10%, Pr. 255 bit 0 is turned
on and also an alarm is output to the Y90 signal.
(4) 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 signal.
⋅ 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 making sure that the power lamp is off, switch on the power supply again.
5) 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
REMARKS
⋅ The life of the main circuit capacitor can not be measured in the following conditions.
(a) The FR-HC, MT-HC, FR-CV, FR-BU, MT-BU5 or BU is connected
(b) Terminals R1/L11, S1/L21 or DC power supply is connected to the terminal P/+ and N/-.
(c) Switch power on during measuring.
(d) The motor is not connected to the inverter.
(e) The motor is running. (The motor is 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.
⋅ Operating environment: Ambient Temperature (annual average 40°C (free from corrosive gas, flammable gas, oil mist, dust
and dirt))
Output current (80% of the rated current of Mitsubishi standard 4P motor)
Description
No measurement
0
1 Measurement start
2 During measurement
3 Measurement complete
Forced end
8
See (c), (g), (h), (i) below.
Measurement error
9
See (d), (e), (f) below.
Remarks
Initial value
Measurement starts when the
power supply is switched off.
Only displayed and cannot be
set
Useful functions
367
4