Mitsubishi Electric 700 Series Instruction Manual page 183

Useful functions
(1) Life alarm display and signal output (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.
bit 15 7
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
Pr. 255 Bit
(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
(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 .
The number of contact (relay, contactor, thyristor) ON times is counted, and it is counted down from 100% (0 times) every
1%/10,000 times.
As soon as 10% (900,000 times) is reached, Pr. 255 bit 3 is turned ON.
(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.
178
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