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Mitsubishi Electric FR-F740-00023 Instruction Manual: Display Of The Life Of The Inverter Parts

F700 series.
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Inspection item
6.1.4

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, 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.
Parts
Main circuit capacitor
Control circuit capacitor
Inrush current limit circuit
Cooling fan
Refer to page 251 to perform the life check of the inverter parts.
6.1.5
Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W).
(2) Prepare a tester. (Use 100
<Checking method>
Change the polarity of the tester alternately at the inverter terminals R/L1, S/L2, T/L3, U, V, W, P/+ and N/ , and check
for continuity.
CAUTION
1. Before measurement, check that the smoothing capacitor is discharged.
2. At the time of discontinuity, due to the smoothing capacitor, the tester may not indicate
measured value is several to several ten-of ohms depending on the module type, circuit tester type, etc. If all measured
values are almost the same, the modules are without fault.
<Module device numbers and terminals to be checked>
Tester Polarity
R/L1
P/
D1
P/
R/L1
S/L2
P/
D2
P/
S/L2
T/L3
P/
D3
P/
T/L3
U
P/
TR1
P/
U
V
P/
TR3
P/
V
W
P/
TR5
P/
W
(Assumes the use of an analog meter.)
292
Judgement level
85% of the initial capacity
Estimated 10% life remaining
Estimated 10% life remaining (Power on: 100,000 times left)
Less than 50% of the predetermined speed
range.)
Tester Polarity
Measured
Value
Discontinuity
R/L1
D4
Continuity
N/
Discontinuity
S/L2
D5
Continuity
N/
Discontinuity
T/L3
D6
Continuity
N/
Discontinuity
U
TR4
Continuity
N/
Discontinuity
V
TR6
Continuity
N/
Discontinuity
W
TR2
Continuity
N/
Measured
Value
N/
Continuity
R/L1
Discontinuity
N/
Continuity
R/L1
S/L2
Discontinuity
S/L2
N/
Continuity
T/L3
Discontinuity
T/L3
N/
Continuity
U
Discontinuity
N/
Continuity
V
Discontinuity
N/
Continuity
W
Discontinuity
. At the time of continuity, the
P/+
Converter module
Inverter module
TR1
D1
D2
D3
C
D4
D5
D6
TR4
N/−
TR3
TR5
U
V
W
TR6
TR2

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