Checking The Inverter And Converter Modules - Mitsubishi FR-A500 Series Instruction Manual

Transistorized inverter: fr-a520-0.4k to 55k(-na) and fr-a540-0.4k to 55k(-na)(-ec)
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! ! ! ! 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
S 〈L
P 〈+〉
2
D2
P 〈+〉
S 〈L
2
T 〈L
P 〈+〉
3
D3
P 〈+〉
T 〈L
3
P 〈+〉
U
TR1
P 〈+〉
U
P 〈+〉
V
TR3
P 〈+〉
V
P 〈+〉
W
TR5
P 〈+〉
W
(Assumes the use of an analog meter.)
Measured Value
Discontinuity
D4
Continuity
1
Discontinuity
D5
Continuity
Discontinuity
D6
Continuity
Discontinuity
TR4
Continuity
Discontinuity
TR6
Continuity
Discontinuity
TR2
Continuity
Converter module
D1
D2
R
〈L
1
S
〈L
2
T
〈L
3
D4
D5
PROTECTIVE FUNCTIONS
〉 and motor cables (U, V, W).
, L
, L
1
2
3
Tester Polarity
R 〈L
N 〈−〉
1
N 〈−〉
R 〈L
1
S 〈L
N 〈−〉
2
N 〈−〉
S 〈L
2
T 〈L
N 〈−〉
3
N 〈−〉
T 〈L
3
N 〈−〉
U
N 〈−〉
U
N 〈−〉
V
N 〈−〉
V
N 〈−〉
W
N 〈−〉
W
P 〈+〉
Inverter module
TR1
TR3
D3
C
D6
TR4
TR6
N 〈–〉
198
Measured Value
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
TR5
U
V
W
TR2
, L
, L
, U,
1
2
3

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