Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 235

Useful functions
(1) Life alarm display and signal output (Y90 signal, Pr. 255)
Whether any of the control circuit capacitor, main circuit capacitor, cooling fan and inrush current limit circuit has reached
the life alarm output level or not can be checked by Pr. 255 Life alarm status display and Life alarm (Y90) signal.
bit 15 7
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
Bit
Pr. 255
(decimal) (binary)
15 1111
14 1110
13 1101
12 1100
11 1011
10 1010
9 1001
8 1000
7 0111
6 0110
5 0101
4 0100
3 0011
2 0010
1 0001
0 0000
The Life alarm (Y90) signal 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 Pr. 190 or Pr. 192 (output
terminal function selection).
NOTE
 Changing the terminal assignment using Pr. 190 and Pr. 192 (output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
(2) Inrush current limit circuit life display (Pr. 256)
The life of the inrush current limit circuit (relay, contactor and inrush resistor) is displayed in Pr. 256.
Activation of inrush current limit resistor circuit is counted. It is counted every 10,000 times (1%) and counts down from
100% (0 time).
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.
The inrush current limit resistor circuit activates under the following conditions:
At power-ON
At undervoltage occurrence (Refer to page 256.)
At drive unit reset
(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.
232
0
1
bit0 Control circuit capacitor life
bit1 Main circuit capacitor life
bit2 Cooling fan life
bit3 Inrush current limit circuit life
Inrush Current
Cooling
Suppression
Fan Life
Circuit Life
 
 
 
 








 




 
 
 
 
 
Pr. 255 read
Main Circuit Control Circuit
Capacitor Life Capacitor Life
 




 
 




 
 




 
 




 
: With warnings, : Without warnings

Pr. 255 setting read
Bit image is displayed
in decimal