Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 198

Transistorized inverter
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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
R 〈L
P 〈+〉
1
D1
P 〈+〉
R 〈L
1
S 〈L
P 〈+〉
2
D2
P 〈+〉
S 〈L
2
T 〈L
P 〈+〉
3
D3
P 〈+〉
T 〈L
3
P 〈+〉
TR
U
P 〈+〉
1
U
P 〈+〉
V
TR
P 〈+〉
2
V
P 〈+〉
W
TR
P 〈+〉
5
W
Measured Value
Discontinuity
D4
Continuity
Discontinuity
D5
Continuity
Discontinuity
D6
Continuity
Discontinuity
TR4
Continuity
Discontinuity
TR6
Continuity
Discontinuity
TR2
Continuity
Converter module
D1
D2
D3
R
〈L
1
S
〈L
2
T
〈L
3
D4
D5
D6
PROTECTIVE FUNCTIONS
〉 and motor cables (U, V, W).
, L
, L
1
2
3
Tester Polarity
Measured Value
R 〈L
N 〈−〉
Continuity
1
N 〈−〉
R 〈L
Discontinuity
1
S 〈L
N 〈−〉
Continuity
2
N 〈−〉
S 〈L
Discontinuity
2
T 〈L
N 〈−〉
Continuity
3
N 〈−〉
T 〈L
Discontinuity
3
N 〈−〉
U
Continuity
N 〈−〉
U
Discontinuity
N 〈−〉
V
Continuity
N 〈−〉
V
Discontinuity
N 〈−〉
W
Continuity
N 〈−〉
W
Discontinuity
P 〈+〉
Inverter module
TR1
TR3
TR5
C
TR4
TR6
TR2
N 〈–〉
185
, L
1
U
V
W
, L
, U,
2
3

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