Mitsubishi Electric FR-F500 Instruction Manual page 192

(1) Checking the inverter and converter modules
<Preparation>
• Disconnect the external power supply cables (R, S, T) <L
• 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
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
P < + >
R <L >
1
D1
P < + >
R <L
P < + >
S <L >
2
D2
P < + >
S <L
P < + >
T <L >
3
D3
P < + >
T <L
P < + >
U
TR1
P < + >
P < + >
V
TR2
P < + >
P < + >
W
TR5
P < + >
Measured Value
Discontinuity
> Continuity
1
Discontinuity
> Continuity
2
Discontinuity
> Continuity
3
Discontinuity
U Continuity
Discontinuity
V Continuity
Discontinuity
W Continuity
Converter module
D1 D2 D3
R
〈L 〉
1
S
〈L 〉
2
T
〈L 〉
3
D4 D5 D6
PROTECTIVE FUNCTIONS
, L , L > and motor cables (U, V, W).
1 2 3
Tester Polarity
N < − >
R <L >
1
D4
N < − >
R <L >
1
N < − >
S <L >
2
D5
N < − >
S <L >
2
N < − >
T <L >
3
D6
N < − >
T <L >
3
N < − >
U
TR4
N < − >
U
N < − >
V
TR6
N < − >
V
N < − >
W
TR2
N < − >
W
P 〈+〉
Inverter module
TR1 TR3
C
TR4 TR6
N 〈–〉
171
Measured Value
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
TR5
U
V
W
TR2
, L , L U, V,
1 2 3,