Checking The Inverter And Converter Modules - Mitsubishi Electric FR-F500 Series Instruction Manual

• • • • Checking the inverter and converter modules
<Preparation>
1) Disconnect the external power supply cables (R, S, T) 〈L
2) 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
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 smoothing 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
S 〈L 〉 P 〈+〉
2
D2
P 〈+〉 S 〈L
T 〈L 〉 P 〈+〉
3
D3
P 〈+〉 T 〈L
P 〈+〉
U
TR1
P 〈+〉
U
P 〈+〉
V
TR3
P 〈+〉
V
P 〈+〉
W
TR5
P 〈+〉
W
(Assumes the use of an analog meter.)
Measured Value
Discontinuity
〉
Continuity
1
Discontinuity
〉
Continuity
2
Discontinuity
〉
Continuity
3
Discontinuity
TR4
Continuity
Discontinuity
TR6
Continuity
Discontinuity
TR2
Continuity
Converter module
D1 D2
R
〈L 〉
1
S
〈L 〉
2
T
〈L 〉
3
D4 D5
〉 and motor cables (U, V, W).
, L , L
1 2 3
Tester Polarity
R 〈L 〉 N 〈−〉
1
D4
N 〈−〉 R 〈L 〉
1
S 〈L 〉 N 〈−〉
2
D5
N 〈−〉 S 〈L 〉
2
T 〈L 〉 N 〈−〉
3
D6
N 〈−〉 T 〈L 〉
3
N 〈−〉
U
N 〈−〉
U
N 〈−〉
V
N 〈−〉
V
N 〈−〉
W
N 〈−〉
W
P 〈+〉
Inverter module
TR1 TR3
D3
C
D6
TR4 TR6
N 〈–〉
182
PROTECTIVE FUNCTIONS
Measured Value
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
TR5
U
V
W
TR2
, L , L U,
1 2 3,
. At the