Mitsumi electronic 55K Welding System User Manual


 
PROTECTIVE FUNCTIONS
179
Checking the inverter and converter modules
<Preparation>
1) Disconnect the external power supply cables (R, S, T)
L
1
, L
2
, L
3
and motor cables (U, V, W).
2) Prepare a meter. (Use 100
range.)
<Checking method>
Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P and N
L
1
, L
2
, L
3,
U,
V, 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 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
UP
〈+〉
Discontinuity U N
〈−〉
Continuity
TR1
P
〈+〉
U Continuity
TR4
N
〈−〉
U Discontinuity
VP
〈+〉
Discontinuity V N
〈−〉
Continuity
TR3
P
〈+〉
V Continuity
TR6
N
〈−〉
V Discontinuity
WP
〈+〉
Discontinuity W N
〈−〉
Continuity
Inverter module
TR5
P
〈+〉
W Continuity
TR2
N
〈−〉
W Discontinuity
(Assumes the use of an analog meter.)
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
Inverter moduleConverter module