COMBO-401 i/501 i
OPERATOR’S MANUAL
15
Table 2:
7. working principle
7.1 Summarize of working principle
The input three-phase AC 415VAC50Hz(60Hz) is rectified and supplied to the IGBT inverter to produce 20
kHz AC. This AC is transformed by the high–frequency transformer and rectified; then goes into the output
terminal of DC power source.
7.2 Main electric elementary diagram
Please refer to appendix 1.
8. Troubles and troubleshooting
8.1 Please check with multimeter if there are any troubles:
Three-phase power should be 380 to 440 VAC, check if there is phase missing or exceeding voltage range;
Whether the fuse on the back panel of the welding machine is ok or not;
Whether the three-phase power switch at the switchboard is damaged; Whether the fuse and electrical power wire
are installed properly, Otherwise it will cause phase missing and the welding machine will work abnormally.
The control cable of the wire feeder is may be broken, check the continuity of related six pins of the connector
plugs at the both ends of the control cable , whether the welding cable is connected properly, and the workpiece is
connected tightly.
Whether the torch switch and the wire connected are damaged or open circuit; whether the nozzle, conduct tip ,
conduct tip’s seat and shunt are burned out and damaged.
Thick
-ness
(mm
）
Wire
diameter
(mm)
Root
gap
G
（
mm
）
Welding
current
(A)
Welding
voltage
（
V
）
Welding
speed
(cm/Min)
Wire out
(mm
）
Gas
flux
(L/Min)
I
typ
e
b
u
tt
w
el
d
in
g
S
low
sp
ee
d
0.8
0.8
0
60
～
70
16
～
16.5
50
～
60
10
10
1.0
0.8
0
75
～
85
17
～
17.5
50
～
60
10
10
～
15
1.2
0.8
0
80
～
90
17
～
18
50
～
60
10
10
～
15
1.6
0.8
0
95
～
105
18
～
19
45
～
50
10
10
～
15
2.0
1,1.2
0
～
0.5
110
～
120
19
～
19.5
45
～
50
10
10
～
15
2.3
1,1.2
0.5
～
1
120
～
130
19.5
～
20
45
～
50
10
10
～
15
3.2
1,1.2
1
～
1.2
140
～
150
20
～
21
45
～
50
10
～
15
10
～
15
4.5
1,1.2
1
～
1.5
170
～
185
22
～
23
40
～
50
15
15
6
Face
1.2
1.2
～
1.5
230
～
260
24
～
26
40
～
50
15
15
～
20
Inside
1.2
1.2
～
1.5
230
～
260
24
～
26
40
～
50
15
15
～
20
9
Face
1.2
1.2
～
1.5
320
～
340
32
～
34
40
～
50
15
15
～
20
Inside
1.2
1.2
～
1.5
320
～
340
32
～
34
40
～
50
15
15
～
20
H
igh
sp
ee
d
0.8
0.8
0
89
16.5
120
10
15
1.0
0.8
0
100
17
120
10
15
1.2
0.8
0
110
18
120
10
15
1.6
1,1.2
0
160
19
120
10
15
2.0
1,1.2
0
180
20
80
15
15
2.3
1,1.2
0
200
22
100
15
20
3.2
1.2
0
240
25
100
15
20
