Mitsubishi FR-D720-5.5K - Display of the Life of the Inverter Parts

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5
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection items
5.1.4 Display of the life of the inverter parts
The self-diagnostic alarm is output when the life span of the control circuit capacitor, cooling fan and each parts of the inrush
current limit circuit is near its end. It gives an indication of replacement time.
The life alarm output can be used as a guideline for life judgement.
For the life check of the main circuit capacitor, the alarm signal (Y90) will not be output if a measuring method of (2) is not
performed.
(1) Display of the life alarm
 Pr. 255 Life alarm status display can be used to confirm that the control circuit capacitor, main circuit capacitor, cooling fan,
and each parts of the inrush current limit circuit has reached the life alarm output level.
Parts Judgement Level
Main circuit capacitor 85% of the initial capacity
Control circuit capacitor Estimated remaining life 10%
Inrush current limit circuit
Estimated remaining life 10%
(Power ON: 100,000 times left)
Cooling fan Less than 50% of the predetermined speed
REMARKS
 Since repeated inrush currents at power ON will shorten the life of the converter circuit, frequent starts and stops of the
magnetic contactor must be avoided.
Pr. 255
(decimal)
Bit
(binary)
Inrush Current
Limit Circuit Life
Cooling Fan Life
Main Circuit
Capacitor Life
Control Circuit
Capacitor Life
15 1111

14 1110
 ×
13 1101
 × 
12 1100
 ××
11 1 011
 × 
10 1010
 ×  ×
9 1001
 ××
8 1000
 ×××
7 0111
× 
60110
×  ×
5 0101
×  × 
4 0100
×  ××
30011
××
2 0010
×× ×
1 0001
×××
0 0000
××××

: With alarm, ×: Without alarm
POINT
Life check of the main circuit capacitor needs to be done by Pr. 259. (Refer to page 120)
000000000000100
bit0 Control circuit capacitor life
1
15bit 7 0
bit1 Main circuit capacitor life
bit2 Cooling fan life
bit3 Inrush current limit circuit life
Pr. 255 read Pr. 255 setting read
Bit image is displayed
in decimal