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Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R, S, T (L
(U, V, W).
(2) Prepare a meter. (Use 100 Ω range.)
<Checking method>
Change the polarity of the meter alternately at the inverter terminals R (L
T (L
), U, V, W, P (+) and N (–), and check for continuity.
3
Note: 1. Before measurement, check that the smoothing capacitor is discharged
2. At the time of discontinuity, the measured value is almost ∞ . When there is
an instantaneous continuity, due to the smoothing capacitor the tester may
not indicate ∞ . At the time of continuity, the measured value is several to
several ten's-of ohms depending on the number of modules, number of
parallel modules, 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
D1
P (+)
S (L
D2
P (+)
T (L
D3
P (+)
TR1
P (+)
TR3
P (+)
TR5
P (+)
(Assumes the use of an analog meter.)
Measured
Value
)
P (+)
Discontinuity
1
R (L
)
Continuity
1
)
P (+)
Discontinuity
2
S (L
)
Continuity
2
)
P (+)
Discontinuity
3
T (L
)
Continuity
3
U
P (+)
Discontinuity
U
Continuity
V
P (+)
Discontinuity
V
Continuity
W
P (+)
Discontinuity
W
Continuity
Converter module
D1 D2
R (L
)
1
S (L
)
2
T (L
)
3
D4 D5 D6
MAINTENANCE/INSPECTION
Tester Polarity
R (L
D4
N (–)
S (L
D5
N (–)
T (L
D6
N (–)
TR4
N (–)
TR6
N (–)
TR2
N (–)
Inverter module
P (+)
TR1
TR3
D3
C
TR4
TR6
N (-)
184
, L
, L
)) and motor cables
1
2
3
), S (L
1
Measured
Value
)
N (–)
Continuity
1
R (L
) Discontinuity
1
)
N (–)
Continuity
2
S (L
) Discontinuity
2
)
N (–)
Continuity
3
T (L
) Discontinuity
3
U
N (–)
Continuity
U
Discontinuity
V
N (–)
Continuity
V
Discontinuity
W
N (–)
Continuity
W
Discontinuity
TR5
U
V
W
TR2
),
2
.
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