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Precautions for Maintenance and Inspection
PROTECTIVE FUNCTIONS
6
<Module device numbers and terminals to be checked>
(Assumes the use of an analog meter.)
6.3.7 Replacement of parts
The inverter consists of many electronic parts such as semiconductor devices.
The following parts may deteriorate with age because of their structural or physical
characteristics, leading to reduced performance and/or fault of the inverter. For
preventive maintenance, the parts must be changed periodically.
Tester Polarity
Measured
Value
Tester Polarity
Measured
Value
Converter
module
D1
R P Discontinuity
D4
R N Continuity
P R Continuity N R Discontinuity
D2
S P Discontinuity
D5
S N Continuity
P S Continuity N S Discontinuity
D3
T P Discontinuity
D6
T N Continuity
P T Continuity N T Discontinuity
Inverter
module
TR1
U P Discontinuity
TR4
U N Continuity
P U Continuity N U Discontinuity
TR3
V P Discontinuity
TR6
V N Continuity
P V Continuity N V Discontinuity
TR5
W P Discontinuity
TR2
W N Continuity
P W Continuity N W Discontinuity
Part Name
Standard Replacement
Interval
Description
Cooling fan 2 to 3 years Replace (as required)
Smoothing capacitor in
main circuit
5 years Replace (as required)
Smoothing capacitor on
control board
5 years Replace the board (as required).
Relays
Replace as required.
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
Converter module
Inverter module
D1 D2 D3
D4 D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
S
T
C
P
N