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

Checking the inverter and converter modules

<Preparation>
(1) Disconnect the external power supply cables (R, S, T <L
(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 <L
V, W, + and ->, and check for continuity.
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
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
U P <+>
TR1
P <+> U
V P <+>
TR3
P <+> V
W P <+>
TR5
P <+> W
(Assumes the use of an analog meter.)
Tester Polarity
Measured Value
Discontinuity R <L
D4
Continuity N <->
Discontinuity S <L
D5
Continuity N <->
Discontinuity T <L
D6
Continuity N <->
Discontinuity
TR4
Continuity N <->
Discontinuity
TR6
Continuity N <->
Discontinuity
TR2
Continuity N <->
P 〈 + 〉
Converter module
D1 D2 D3
R
〈 L 〉 C
1
S
〈 L 〉
2
T
〈 L 〉
3
D4 D5 D6
N 〈 – 〉
209
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
, L , L >) and motor cables (U, V, W).
1 2 3
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
Inverter module
TR1 TR3 TR5
U
V
W
TR4 TR6 TR2
, L , L , U,
1 2 3
. At the
6