PROTECTIVE FUNCTIONS
159
!
!!
! Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R(L
1
), S(L
2
), T(L
3
)) and motor cables
(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
1
), S(L
2
),
T(L
3
), U, V, W, P(+) and N(
−
), 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 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
Tester
Polarity
+
−
−−
−
Measured
Value
+
−
−−
−
Measured
Value
R(L
1
) P(+) Discontinuity R(L
1
)N(
−
) Continuity
D1
P(+) R(L
1
) Continuity
D4
N(
−
)R(L
1
) Discontinuity
S(L
2
) P(+) Discontinuity S(L
2
)N(
−
) Continuity
D2
P(+) S(L
2
) Continuity
D5
N(
−
)S(L
2
) Discontinuity
T(L
3
) P(+) Discontinuity T(L
3
)N(
−
) Continuity
Converter
module
D3
P(+) T(L
3
) Continuity
D6
N(
−
)T(L
3
) Discontinuity
U P(+) Discontinuity U N(
−
) Continuity
TR1
P(+) U Continuity
TR4
N(
−
) U Discontinuity
V P(+) Discontinuity V N(
−
) Continuity
TR3
P(+) V Continuity
TR6
N(
−
) V Discontinuity
W P(+) Discontinuity W N(
−
) Continuity
Inverter module
TR5
P(+) W Continuity
TR2
N(
−
) W Discontinuity
Converter module Inverter module
D1 D2 D3
D4
D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
R(L
1
)
S(L
2
)
T(L
3
)
C
P(
+
)
N
−
5
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