SM_Minarc 150_V1.1EN.pdf
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1005 KB
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Service Manual
Ver. 1.1
150
150
VRD
151
Contents
3
Technical data………………………….……………...
4
Operation principle…………………………………….
4 - 6
Main circuit…………………………………….……...
7
Troubleshooting diagram………………………...……
8
Main ciruit diagrams………………………………….
9
Block diagram………………………………….……..
10
Operational tests / measurings…………...........……...
10, 11
Measurings...……………………...…..
12
Main transformer T001 prim. voltage...
13
Main transformer T001 sec. voltage.....
14
Voltage after sec. rectifier..............…...
15
Auxiliary coil voltage..………………..
16
Fan M001 voltage..........………………
16
Pole voltage in OCV........…………….
17
Measuring points in the flat cable..…...
18
Gate control, upper IGBTs.…………...
19
Gate control, lower IGBTs.…………...
20
Aux. voltage in DC-link..………….….
20
Signal lamp H2 control / VRD ON..….
21
Main circuit card Z001 connectors.…………………...
22
Main circuit card Z001 layout…..……………………..
23
Control card A001 layout.……………………………..
24, 25
Structure………………………………………………..
26
IGBT-transistor testing..............……………………….
26
Sec. diode testing.............……………………………..
27
Notes............…………………………………………..
Technical data
Minarc 150
Minarc 150
VRD
Minarc 151
Supply voltage, 1~ 50/60 Hz
230 V ± 15%
230 V ± 15%
110 V ± 15%
Loadability
35% ED (MMA)
140 A (7,5 kVA)
140 A (7,5 kVA)
140 A (7,5 kVA)
100% ED (MMA)
100 A (5,1 kVA)
100 A (5,1 kVA)
100 A (5,1 kVA)
35% ED (TIG)
150 A (5,0 kVA)
150 A (5,0 kVA)
150 A (5,0 kVA)
100% ED (TIG)
110 A (3,3 kVA)
110 A (3,3 kVA)
110 A (3,3 kVA)
Supply cable / fuses
2,5 mm² S / 3,3 m 16 A
2,5 mm² S / 3,3 m 16 A
6 mm² S / 2,0 m 32 A
Welding current range (MMA)
10 A / 20,5 V…140 A / 25,6 V
10 A / 20,5 V…140 A / 25,6 V
10 A / 20,5 V…140 A / 25,6 V
Suitable stick sizes
ø 1,5…3,25 mm
ø 1,5…3,25 mm
ø 1,5…3,25 mm
Welding power adj.
Stepless
Stepless
Stepless
OCV
~ + 85 V
~ + 30 V
~ + 85 V
Idling power
< 10W
< 10W
< 10W
Efficiency
0,8
0,8
0,8
Power factor
0,60 (140 A / 25.5 V)
0,60 (140 A / 25.5 V)
0,60 (140 A / 25.5 V)
Temperature class
B (130°C) / H (180°C)
B (130°C) / H (180°C)
B (130°C) / H (180°C)
Operation temperature range
-20…+40°C
-20…+40°C
-20…+40°C
Stock temperature range
-40…+60°C
-40…+60°C
-40…+60°C
Casing class
IP 23C
IP 23C
IP 23C
Norms
IEC 60974-1, -10
IEC 60974-1, -10
IEC 60974-1
EN 50199
EN 50199
EN 50199
Dimensions
Length
320 mm
320 mm
320 mm
Width
123 mm
123 mm
123 mm
Height
265 mm
265 mm
265 mm
Weight
4,0 (4,6) kg
4,0 (4,6) kg
4,4 (5,2) kg
3
Operation principle
Minarc power sources are”dual-Forward” inverters, controlled by PWM technology.
Switching components are IGBT transistors. The operation frequency is ~ 80 kHz.
Below is a picture of the ”dual-forward” inverter operation principle.
VDC
105
~ + 320 V
V1
t
1/3
13µs
V2
When IGBTs V1 and V2 are non-conductive no power is transferred. Power is altered by
changing the transistor´s timing (PWM).
Main circuit
R9
X11
/
12
X1
X13
L2
L1
V11
+ t
+ t
X3
X12
R30
R23
K1
X5
Primary circuit connection, Minarc 150/150 VRD.
4
Main circuit
R14
R17
R13
R8
R9
X11
/
12
X1
X13
X2
L1
L2
V10
X3
X12
X4
X5
Primary circuit connection, Minarc 151.
C21
R34
V28, V29
L001
X7
X003
X6
U
R35
V24
X8
X11/11
X004
X9
V19
R11
V30
V28
V22
X11/14
X1
0
X21
X11/15
V18
X22
C18
X5
Secondary circuit connection, Minarc 150/151.
5
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