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Checking The Inverter And Converter Modules - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

Transistorized inverter, high function & low acoustic noise.
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z Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R, S, T) 〈L
(2) Prepare a meter. (Use 100Ω range.)
<Checking method>
Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P and N 〈L
V, W, + and −〉, and check for continuity.
Note: 1. Before measurement, check that the smoothing capacitor is discharged.
2. At the time of continuity, the measured value is several to several ten's-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
Measured Value
R 〈L
P 〈+〉
Discontinuity
1
D1
P 〈+〉
R 〈L
Continuity
1
S 〈L
P 〈+〉
Discontinuity
2
D2
P 〈+〉
S 〈L
2
Continuity
T 〈L
P 〈+〉
Discontinuity
3
D3
P 〈+〉
T 〈L
Continuity
3
P 〈+〉
U
Discontinuity
TR
P 〈+〉
1
U
Continuity
P 〈+〉
TR
V
Discontinuity
P 〈+〉
2
V
Continuity
P 〈+〉
W
Discontinuity
TR
P 〈+〉
5
W
Continuity
R
〈L
〈L
〈L
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, L
1
Tester Polarity
R 〈L
1
D4
N 〈−〉
S 〈L
2
D5
N 〈−〉
T 〈L
3
D6
N 〈−〉
U
TR4
N 〈−〉
V
TR6
N 〈−〉
W
TR2
N 〈−〉
P 〈+〉
Converter module
Inverter module
TR1
D1
D2
D3
C
1
S
2
T
3
D4
D5
D6
TR4
N 〈–〉
185
PROTECTIVE FUNCTIONS
〉 and motor cables (U, V, W).
, L
2
3
Measured Value
N 〈−〉
Continuity
R 〈L
Discontinuity
1
N 〈−〉
Continuity
S 〈L
2
Discontinuity
N 〈−〉
Continuity
T 〈L
Discontinuity
3
N 〈−〉
Continuity
U
Discontinuity
N 〈−〉
Continuity
V
Discontinuity
N 〈−〉
Continuity
W
Discontinuity
TR3
TR5
U
V
W
TR6
TR2
, L
, L
, U,
1
2
3

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