Mitsubishi Electronics FR-A500 Manuale Utente
213
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Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R, S, T) and motor cables (U, V, W).
(2) Prepare a tester. (Use 100
(2) Prepare a tester. (Use 100
Ω
range.)
<Checking method>
Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P and N, and check for
continuity.
<Module device numbers and terminals to be checked>
(Assumes the use of an analog meter.)
Note: 1. Before measurement, check that the smoothing capacitor is discharged.
2. At the time of discontinuity, due to the smothing 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
module type, circuit tester type, etc. If all measured values are almost the same, the modules are
without fault.
Tester Polarity
Measured Value
Tester Polarity
Measured Value
Convert
e
r module
D1
R
P
Discontinuity
D4
R
N
Continuity
P
R
Continuity
N
R
Discontinuity
D2
S P
Discontinuity
D5
S
N
Continuity
P
S
Continuity
N
S
Discontinuity
D3
T
P
Discontinuity
D6
T
N
Continuity
P
T
Continuity
N
T
Discontinuity
In
v
e
rt
er m
odule
TR1
U
P
Discontinuity
TR4
U
N
Continuity
P
U
Continuity
N
U
Discontinuity
TR3
V
P
Discontinuity
TR6
V
N
Continuity
P
V
Continuity
N
V
Discontinuity
TR5
W
P
Discontinuity
TR2
W
N
Continuity
P
W
Continuity
N
W
Discontinuity
D1
D2
D3
D4
D5
D6
TR1
TR3
TR5
TR4
TR6
TR2
U
V
W
C
Inverter module
Converter module
R
S
T
P
N