Display Of The Life Of The Inverter Parts; Checking The Inverter And Converter Modules - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Fr-f700p 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 282 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 100Ω range.)
<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 electric continuity.
CAUTION
1. Before measurement, check that the smoothing capacitor is discharged.
2. At the time of electric discontinuity, due to the smoothing capacitor, the tester may not indicate ∞. At the time of electric
continuity, the 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.)
334
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
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
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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