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Checking The Inverter And Converter Modules - Mitsubishi Electric F800-E Series Instruction Manual

Separated converter type.
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Inspection item
5.1.4

Checking the inverter and converter modules

Preparation
• Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W). (The inverter and the converter
unit (FR-CC2-C) can be measured with those cables connected.)
• Prepare a tester. (For the resistance measurement, use the 100  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 the
electric continuity.
NOTE
• Before measurement, check that the smoothing capacitor is discharged.
• At the time of electric discontinuity, the measured value is almost ∞. When there is an instantaneous electric continuity, due to
the smoothing capacitor, the tester may not indicate ∞. At the time of electric continuity, the measured value is several  to
several tens of . If all measured values are almost the same, although these values are not constant depending on the
module type and tester type, the modules are without fault.
Module device numbers and terminals to be checked
Converter module
D1
D2
D3
R/L1
C
S/L2
T/L3
D4
D5
D6
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.)
66
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inverter module
P/+
P/+
TR1
C
TR4
N/-
N/-
Tester
polarity
Result
Discontinuity
R/L1,
D4
Continuity
N/-
R/L1, Discontinuity
Discontinuity
S/L2,
D5
Continuity
N/-
S/L2, Discontinuity
Discontinuity
T/L3
D6
Continuity
N/-
T/L3 Discontinuity
Discontinuity
U
TR4
Continuity
N/-
Discontinuity
V
TR6
Continuity
N/-
Discontinuity
W
TR2
Continuity
N/-
TR3
TR5
U
V
W
TR6
TR2
Result
N/-
Continuity
N/-
Continuity
N/-
Continuity
N/-
Continuity
U
Discontinuity
N/-
Continuity
V
Discontinuity
N/-
Continuity
W
Discontinuity

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