200ACDC
training manual
Shanghai WTL Welding Equipment
Manufacture Co.,Ltd
FEB 2012
FEB.2012
Catalogue
•
•
•
•
•
•
1、Introduction of working principle
2、Introduction of main circuit
3、Introduction of control circuit
4、Introduction of panel circuit
5 Introduction of other circuit
5、
6、Troubleshooting
1、Introduction of working
principle
i i l
1.1
Working principle
1.2
System chart
1.3 Explosion drawing
1.4
No
Component Listing
Code
Title
Quantity
1
8.253.020
HANDLE
1
2
8.301.099
COVER
1
3
8.062.543
4
7.202.123
5
7 202 029
7.202.029
6
5.496.931-D
WSE(WSME)-200(PFC) EMC BOARD
1
7
5.496.526-D
WSE-160/200 SWITCH POWER BOARD
1
8
5.496.875-J
315A OUTPUT RECTIFIER BOARD
1
9
5.496.415-I
TP、WSME MCU CONTROL BOARD
1
10
5.496.470-C
11
6.185.515-A
MAIN TRANSFORMER
1
12
6.271.515
INDUCTANCE
1
13
6.174.523
HIGH FREQUENCY COUPLING
INDUCTANCE
1
14
7.321.102
HALL
1
15
8.055.523
BASE
1
16
8.050.099
MOUNTING PLATE(RIGHT)
2
BREADBOARD MOUNTING
FUSE （LONG）
FUSE BLOCKS
HIGH FREQUENCY BOARD
1
1
1
1
17
5.496.416-E
18
8.068.099
19
8.306.523
FRONT PANEL COVER
1
20(1)
8.103.523
DISPLAY MASK
1
20(2)
7.458.053-B
KNOB（285C）
1
21
8.065.570-C
FRONT OUTPUT BOARD
1
22
7.152.312
SOCKET
2
23
7.132.116
8 PIN AIR SOCKET
1
24
8 462 010 CB
8.462.010-CB
FRONT GAS JOINT
1
25
8.307.634
26
7.232.022
SWITCH
1
27
7.155.001
CABLE CLAMP
1
28
7.154.474
POWER PLUG
1
29
8.122.366
30
7.253.013
31
7.720.030
TP/TS/WSME DISPLAY BOARD
REAR PANEL
BACK BLANKING PLATE
FAN MOUNTING PLATE
TWO-POSITION SOLENOID VALVE
FAN
1
2
1
1
1
1
PART 1
A--1
8.425.500
A--2
8.746.030
A--3
8.425.501
A--4
7.445.311
ALUMINUM RESISTOR
2
A--5
7.231.280
THERMAL SWITCH
2
A--6
7.425.631
DISCRETE IGBT
12
A--7
7.421.681
FRD
2
A--8
5.496.674-F
WSE-160 AC INVERTER BOARD
1
A--9
8.306.301
DUSTPROOF PLATE Ⅰ
1
HEAT SINK Ⅰ
HEAT SINK BOX
HEAT SINK II
1
1
1
PART 2
B--1
8.425.503
B--2
8.425.502
HEAT SINK III
1
B--3
8.746.029
HEAT SINK BOX
1
B--4
7.411.010
RECTIFIER
2
B--5
5.496.527-D
WSE-160/200 DC IGBT MOUNTING
PLATE
1
B--6
7.460.800
MAIN CAPACITOR
6
B--7
8.052.500
WIND SHUTTER II
1
HEAT SINK IV
1
2、Introduction of main
circuit
PART1: RECTIFIER AND INVERTER PCB
8.066.527-D
Schematic Diagram
Soft start and Rectifier
SD
1
2
DC+
OC ttestt
D22
OC
2
1
J1
1
3
D21
AC220V1
R12 R19 R20
AC
+
AC
-
C6
C7
R24
2
ZBYQ1
R23
4
1
CY1
1
1
C8
Q2
AC
+
C9
C10
R26
2
R25
D19
3
AC220V2
OC
1
CU3
AC
-
DC-
4
CU4
Gdn
R8
T3
DC+
R9
IN
C1
1 R1
2
3
4
5
6 OC
7
D5
R10
T4
U3
1
2
R2
3
4
VCC
VCC
IN
OUT
NC
OUT
GND GND
8
7
T1
C2
U4
2
R3
3
4
VCC
VCC
IN
OUT
NC
OUT
GND GND
ZD2
ZD3
R11
B2
ZBYQ
1
5
R4
D2
1
R7
R6
D1
6
8
7
R15
R13
R16
ZD5
T2
R17
T6
R5
R18
6
5
T5
D6
R14 ZD4
C3
D3
D4
Drive transformer
C30
R21
PTC
C32
D20
C5
Q1
DC-
IGBT driver
C31
View of main board
Photo of main board
Description
1）The main
purpose of this PCB
is rectifier、 filter
andd inverter;
i
t
2）The function of
Q1、Q2 is rectifier,
The function of
C5…C10 is filter,
the function of
T3 T6 is
T3…T6
i inverter;
i
t
T3…T6
C5…C10
Q1、Q2
Test of FRD
1）The function of U5、U6 is to drive discrete IGBT;
2）D1、D2 is Fast Recovery Diode (FRD);
3）Please switch off the main power source, Only connect AC220V to 8.066.526
8.066.526-G.
G.
when testing IGBT driving waveform, and make sure that the welding mode is MMA.
220V INPUT
IGBT Testing
test discrete
di
IGBT as follows
f ll
(Wi h
(Without
Main
M i Power)
P
)
1)Select the continuity function on the meter (marked with a diode
symbol).
symbol)
2) Test the Collector and Emitter of IGBT with positive and
negative pin. The IGBT is OK as it is showed below:
From left
F
l f to right,
i h the
h three
h
pins
i
off IGBT are GATE
COLLECTOR and EMITTER.
The drive waveform is as it showed below;
Otherwise please don’t connect the 220V input
ppower and check the control board .
PART2: AC/DC SELECTION PCB
9.066.674-F
2.2.1 Photo of AC Board
IGBT
AC Drive
D i
Part
P
U5、
U6
IGBT
F t Recovery
Fast
R
Diode
Testt discrete
T
di
t IGBT as follows
f ll
(With t Main
(Without
M i Power)
P
)
1)Please switch off the main power source, Only connect
AC220V to 8.066.526-G.when testing IGBT driving waveform,
and
d make
k sure that
h the
h welding
ld
mode
d is MMA/AC.
/ C
2)Test the Collector and Emitter of IGBT with positive and negative pin. The
IGBT is OK as it showed below:
From left to right, the three pins of IGBT are EMITTER、COLLECTOR
and GATE。The positive pin connects to COLLECTOR and the negative
pin connects to EMITTER.
The drive waveform is as it showed below;
Otherwise please don’t connect the 220V input
ppower and check the control board .
To test Fast Recovery Diode D1、D2
D1 D2 as follows (Without Main
Power)：
)
the continuityy function on the meter ((marked with a diode
1)Select
symbol).
2)When finished test ,switch the positive pin (RED) and negative pin
(BLACK) andd test again.
i The
Th FRD is
i OK as it
i showed
h
d below:
b l
3、Introduction of control
circuit
This page includes 2 parts:
1. The OT part works when the machine becomes too hot;
2. The Q
QF/HF p
part p
provides control signal
g
for g
gas valve and
high frequency board.
24V
OT
R325
+15V
U306
1
2
3
C312
R324
VSS
OT
C311
C100
R323
C101
VSS
24V
GND2
D204
Ai Ct l
AirCtrl
U303
R314
QF/HF
C106
24V
T205
R316
C26
R315
GND2
C31
C306
VSS
U301
HF R309
C302
VSS
C307
C107
1
2
3
4
This page includes 3 parts: gun、remote、pedal.
The Connector GUN connect to the 8pin control
socket on the front p
panel , to control g
gun、remote and
pedal respectly.
VCC
ZD201
R248
24V
U304
gun
D203
FC6
R250
FC8
FC5
R249
EMI滤波器
1
R70
VSS
2
C158
3
R158
U15
4
R152
R153
VCCU14
C153
VSS 9
R154
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
5
6
7
8
GUN
GUN2
5
GUN1
4
3
2
1
GND
1 2
15V2
15V2
R150
VSS
R151
VSS
C150
24V
1
U20
R31
pedal_I
U3C
8
8
10
9
ZD7
C2
+15V
R63
C3
R45
7
6
5
8
7
6
3
5
4
3
C152
3
R67
C32
R66
VSS
C9
R65
C5
2
2
Vout
U12
VSS
1
1
Vin
15V2
2
VSS
R62
U13
7815
GND
D
remote
R64
15V2
15V2
R68
4
VSS
VSS
High-Linearity Analog Optocouplers
R69
C1
VCC
14
U2A
1
SPD
2
7
D12
U2B
3
R32
D2
4
D11
D4
PPG_AC
R36
ACPOUT
U2C
5
6
C34
1
2
3
R33
C46
R37
U2D
9
8
VCC
5
R30
D9
B
2
Y
4
11
U2E
10
D8
3
D6
A
3
R22
U9
5
1
C28
C43
The ACPOUT p
part outputs
p
AC/DC drive signal
g
according
g to the selection
of AC/DC on the panel.
AC20
+15V
WA
D3
-15V
R47
R38
IF
IF_adj0
R46
R59
D13
ZD1 C44
R39
2
-15V
R34
U3A
1
3
D14
6
5
7
3
1
A
R405
R404
C313
-15V
ZD2
4
-15V
Current_RT
U3B
2
D5
R58
C45
11
1
2
3
4
+15V
AD_adj0
R60 +15V
The Connector WA connect to the HALL ,
It’ss the feedback of output current.
It
current
Current_FT
C413
C29
3
AC
R51
V FB
V_FB
V+
C50
V-
AC
1
2
R48
D7
R43
C56
R52
C54
R50
4
WV
2
1
R40
VSS2
V+
+ V-
R42
IN+
OUT
IN
IN-
3
R44
4
C52
C51
VSS2
C53
2
+15V2
+15V2
3
4
3
4
CPU
2
1
1
8
2
7
6
5
7
1
+15V
3
6
5
R306
U8
8
R53
C55
IN+
OUT
INV+ V
V-
R41
R49
VSS2U7
1
5
U6
5
V_FB
Voltage_RT
2
VSS2
4
R54
R304
ZD204
1
2 Wvf
C301
3
R305
Voltage_FT
C404
+15V
VSS2
The Connector WV connect to the output , It’s the
p voltage,
g Through
g the High-Linearity Analog
feedback of output
Optocouplers feedback to CPU.
View of control board
Photo of control board
QF/HF
GUN
SOURCE
WV
OT
MB
SS
WA
POWER
+15V
ACPOUT
DRIVE
• DRIVE--Connected with main board to provide drive
signal for discrete IGBT.
Pin 1---- +15V；Pin 2~5---- Drive signal；Pin 6---- OC signal; Pin 7---- GND
• SOURCE--Connected with switch power
PCB5 066 526 G provide 24V power source .
PCB5.066.526-G
• MB--Connected with panel board to communicate.
• QF/HF
QF/HF--Connected
Connected with main board to provide
power source for the gas valve and high frequency
signal for the HF arc making board.
• GUN--Connected with the torch to provide signal of
gun.
• ACPOUT--Connected
ACPOUT Connected with the IGBT driver PCB to
provide AC/DC driver signal.
• OT -- Connected with the temperature relay
to provide over
over-temperature
temperature signal for MCU.
MCU
• SS -- Connected with 8.066.527-D to control
start up the relay .
• WV -- Connected with the output to sample
voltage signal.
• WA -- Connected with HALL sensor to sample
current signal.
Pin 1--- +15V；Pin 2--- -15V；Pin 3---0~4V; Pin 4--- GND
• POWER -- Connected with switch power
PCB5.066.526-G to provide control board with
power source
Pin 1--- +24V；Pin 2--- 0V；Pin 3--- -24V;
• +15V -- This +15V voltage supplies power to
part
AC board to make sure the AC drive p
works normally.
1）Please don’t switch off the machine when the alarm pilot lamp is on.
Trouble: The alarm light is on.
Handles:
dl Check
Ch k MS2003
S2003 module
d l in
i the
h power board.
b d
If No.10 ppin is 15V,, OT alarm happens.
pp
――― Decrease duty
y cycle,
y ,
interval work. or check fan.
If No.9 pin is 15V, LV alarm happens. ―――Check the input voltage
or use the stable power supply.
If No.7 pin is 15V, OC alarm happens. ―――Check and repair the
discrete IGBT ,FRD
FRD or main transformer.
transformer
2) If the
th control
t l board
b d was broken,
b k the
th reasons will
ill be
b as following:
f ll i
The alarm pilot lamp is on without over-voltage, over-current, lower-voltage and
over-temperature—MS2003 module may be broken.
There is no +15 V supply voltage on the power board.--LM2576 may be broken.
The normal output waveform (amplitude to 5 V) of the 11th or 14th pin of SG3525
is as follows:
The output waveform of the 11th or 14th pin of SG3525
If there is false waveform or no waveform, first ,test IGBT, then test SG3525.
At the end, replace the broken electronic parts.
Pin1 - Pin8
Pin9 – Pin16
Connect to
Pin11
Connect to
Pin14
Pin11 and Pin14 are output
pins of chip SG3525.
• SWITCH--To select test or normal status.
• 1、2、3—To select current
• 4—up normal status 4—down
• 5 No use
test status
A: by adjusting it to make the
display current accord with the
actual current.
Imax: By adjusting it to
make the pre-setting
maximum current accord
with the actual current.
Imin: By adjusting it to make
the pre-setting minimum
current accord with the actual
current.
R68: by adjusting it to make
the remote maximum current is
200A.
Wvf: by adjusting it to
make the actual voltage
accord with display voltage
4、Introduction of panel
circuit
Schematic of panel board
Key driver
d i chip
hi
U2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DIG7-3R38
DIG6-3R37
DIG5-3R36
DIG4-3R35
DIG3-3R34
DIG2-3R33
DIG1-3R32
DIG0-3R31
DIG7-1
DIG6-1
DIG5-1
DIG4-1
DIG3-1
DIG2-1
DIG1-1
DIG0-1
DIG7
DIG6
DIG5
DIG4
DIG3
DIG2
DIG1
DIG0
GND
GND
NC
NC.
RST
RST#
H3L2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RSTI
SCL
SDA
ADDR
INT#
VCC
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
VCC
SCL1
SDA1
ADDR0
KEY
VCC
VCC
SEG7-1
SEG6-1 C1
SEG5-1
SEG4-1
SEG3-1
SEG2-1
SEG1-1
SEG0-1
R_TP
L33
R19
TP/TS
C2
R_TS C19
VCC
SEGA
SEGB
SEGC
SEGD
SEGE
SEGF
SEGG
SEGA
SEGB
SEGC
SEGD
SEGE
SEGF
SEGG
SEGDP
DIG3
DIG4
DIG5
11
7
4
2
1
10
5
6
3
12
9
8
VCC
C9
U1
1
12
13
2
11
6
7
3
10
5
8
24
SDA1
LOAD
SCL1
A
B
C
D
E
F
G
NC
DP
DIG1
DIG2
DIG3
DIG0
DIG1
DIG2
DIG3
DIG4
DIG5
DIG6
DIG7
4
DIN
VCC
LOAD
CLK
ISET
DIG0 SEG A
DIG1 SEG B
DIG2 SEG C
DIG3 SEG D
DIG4 SEG E
DIG5 SEG F
DIG6 SEG G
DIG7
DOUTSEG DP
GND
19
C5
18
14
16
20
23
21
15
17
R1
VCC
SEGA
SEGB
SEGC
SEGD
SEGE
SEGF
SEGG
22
Key
SEG7-1
A
B
C
D
E
F
G
NC
DP
DIG1
DIG2
DIG3
Indicator driver chip
U4
SEG6-1
SEGDP
DIG0
DIG1
DIG2
11
7
4
2
1
10
5
6
3
12
9
8
U3
SEGDP
9
GND
K1
DIG0-3
VCC
C18
Indicator
L4
L5
SEGF_1
L3
SEGE_1
L2
SEGD_1
L1
SEGC_1
SEGB_1
DIG1_1
SEGA_1
DIG0_1
DIG0_1
DIG1_1
DIG2_1
DIG3_1
DIG4_1
DIG5_1
DIG6_1
DIG7_1
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
L17
L18
DIG2_1
DIG3_1
DIG4_1
L19
L20
L21
L22
L25
L26
L27
L28
1
12
13
2
11
6
7
3
10
5
8
24
L24
L23
4
U6
DIN
VCC
LOAD
CLK
ISET
DIG0 SEG A
DIG1 SEG B
DIG2 SEG C
DIG3 SEG D
DIG4 SEG E
DIG5 SEG F
DIG6 SEG G
DIG7
DOUTSEG DP
GND
19
C6
18
14
16
20
23
21
15
17
R2
3
C1 C2
O1 O2
K9
2
1
4
3
1
DIG1-3
3
DIG2-3
1
3
SEGDP_1
K3
C1 C2
O1 O2
2
4
9
GND
pulse duty
iso2
Connector
Knob
iso1
DIG4-3
3
R41
3
C1 C2
O1 O2
K6
C1 C2
O1 O2
2
4
2
4
U5A
6
C16
1
O1
C15
DIG5-3
VCC
C17
K5
B
C14
1
VCC
C4
A
C13
R40
LR1
C3
O2
C12
R39
1
2
3
4
5
6
7
8
9
10
C
C11
R20
TP/TS
SDA1 R21
SCL1 R22
ADDR0R23
KEY R24
LOAD R25
B0
R26
B1 R27
VCC
C10
R18
2
1
32
41
J1
R28
R17
MP1 3
4
5
S
D
3
C7
Q
1
B1
CLK
C8
C1 C2
O1 O2
2
4
VCC
SEGA_1
SEGB_1
SEGC_1
SEGD_1
SEGE_1
SEGF_1
SEGG_1
22
1
R
Q
2
1
4
R29
R30
DIG7-3
3
B0
K8
C1 C2
O1 O2
2
4
K10
C1 C2
O1 O2
2
4
Vi
View
off panell board
b
d
Photo of p
panel board
Key driver chip
DIG7-3R38
DIG6-3R37
DIG5-3R36
DIG4 3R35
DIG4-3
DIG3-3R34
DIG2-3R33
DIG1-3R32
DIG0 3R31
DIG0-3
U2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DIG7-1
DIG6-1
DIG5-1
DIG4 1
DIG4-1
DIG3-1
DIG2-1
DIG1-1
DIG0 1
DIG0-1
VCC
CC
DIG7
DIG6
DIG5
DIG4
DIG3
DIG2
DIG1
DIG0
GND
GND
NC
NC.
RST
RST#
H3L2
RSTI
SCL
SDA
ADDR
INT#
VCC
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SCL1
SDA1
ADDR0
KEY
VCC
SEG7-1
SEG6 1 C1
SEG6-1
SEG5-1
SEG4-1
SEG3-1
SEG2 1
SEG2-1
SEG1-1
SEG0-1
C2
Indicator driver chip
VCC
C9
U1
SDA1
LOAD
SCL1
DIG0
DIG1
DIG2
DIG3
DIG4
DIG5
DIG6
DIG7
1
12
13
2
11
6
7
3
10
5
8
24
4
DIN
VCC
LOAD
CLK
ISET
DIG0 SEG A
DIG1 SEG B
DIG2 SEG C
DIG3 SEG D
DIG4 SEG E
DIG5 SEG F
DIG6 SEG G
DIG7
DOUTSEG DP
GND
GND
19
C5
18
14
16
20
23
21
15
17
R1
22
100n
10uF/25V
VCC
20K
SEGA
SEGB
SEGC
SEGD
SEGE
SEGF
SEGG
SEGDP
9
MAX7221
VCC
C18
DIG0_1
DIG1_1
DIG2_1
DIG3_1
DIG4_1
DIG5 1
DIG5_1
DIG6_1
DIG7_1
1
12
13
2
11
6
7
3
10
5
8
24
4
U6
DIN
VCC
LOAD
CLK
ISET
DIG0 SEG A
DIG1 SEG B
DIG2 SEG C
DIG3 SEG D
DIG4 SEG E
DIG5 SEG F
DIG6 SEG G
DIG7
DOUTSEG DP
GND
MAX7221
GND
19
C6
18
14
16
20
23
21
15
17
R2
22
9
SEGA_1
SEGB_1
SEGC_1
SEGD_1
SEGE_1
SEGF 1
SEGF_1
SEGG_1
SEGDP_1
100n
10uF/25V
20K
VCC
5 、Introduction of other circuit
5.1.1 Photo of HF Board
9.066.470-C
5.1.2 Schematic of HF Board
T1
5
2
4
4
1
1
3
KG
COIL
R1
2
2
R3
D1
1
V1
3
3
D2
L1
1
2
3
R2
4
3
2
1
C3
R4
C4
D3
D4
110V
3
2
1
SOU
+24
HF absorb circuit
2
4
1
2
C8
K1
1
C7
R7
1
B
V3
C5
C6
E
1
2
R5
3
HF
C
2
3
12
D5
34
R6
2
+
-
connect to the welder output terminal
1 2
5
C1
3
2
1
G
1
220V
V2
521
5.2.1
Photo
Ph t off Switch
S it h Power
P
Board
B
d
8 066 526 G
8.066.526-G
1
2
5 2 1 Schematic
5.2.1
S h
ti off Switch
S it h Power
P
Board
B
d
1
R40
2 1
C40
2
L1
D10
D11
DCIN
B1
3
2
1
12
D8
C41
C11
C12
TVS1
R41
D19
1
R27
D21
11
9
D9
18
7
6
2
5
4
2
R29
D20
3
C15
C16
C17
C18
1
2
12
C19
11
9
R31 +24V
C20
D13
C21
POWER/FJ
1
2
3
4
5
8
7
6
D15
D14
C24
L3
5
4
3
C23
C22
-24V
R32
L4
NTCS
3
D16
D17
C25
C26
C27
C28
R33
TAP A
R34
D18
2
6
U2A
1
4
C29
L
D
1
3
U1
1
R35
2
F
X
S
ZD6
5
3
4
R36
C13
R37
DY3
+01
L2
D12
B
C
DY2
+24V1
24V1
R28
2
1
2
R30
DY1
C14
ZD7
1
2
6、Troubleshooting
g
Power Source Problems
FAULT
CAUSE
REMEDY
1. Mains supply voltage is
ON power iindicator
ON,
di t is
illuminated however unit
will not commence
welding when the torch
trigger switch is
depressed.
A. Power source is not in
th correctt mode
the
d of
f
operation.
A. Set the power source
t th
to
the correctt mode
d
of operation with the
process selection
switch
switch.
B. Repair or replace
torch trigger
switch/lead.
switch/lead
B Faulty torch trigger.
B.
trigger
2. Mains supply voltage is A. Primary control fuse
ON, indicator light is not
is blown.
lit and weldin
welding arc cann
cannott
be established.
B. Broken connection in
primary circuit.
A. Replace primary
control fuse.
B Have an Accredited
B.
CIGWELD Service
Agent check primary
circuit.
circuit
3. Welding output
continues when torch
t i
trigger
released.
l
d
A. Change to 2T
(NORMAL) mode.
B Repair
B.
R
i or replace
l
Torch/trigger lead.
A. Trigger mode
selection is in
4T(LATCH) mode.
d
B. Torch trigger leads
shorted.
FAULT
CAUSE
REMEDY
4. Welding output
current is present when
the torch trigger switch
is depressed but arc
cannott be
b established.
t bli h d
Poor or no work lead
contact
Clean work clamp area
and ensure good
electrical contact.
5. Welding output
currentt is
i nott presentt
when torch trigger
depressed.
Faulty trigger switch
/l d
/lead.
Repair or replace Torch
/t i
/trigger
llead.
d
6. TIG electrode melts
when arc is struck.
TIG torch is connected
Connect the TIG torch
to the (+) VE terminal.
to the (-) VE terminal.
7.Arc
7
Arc flutters during
TIG welding.
Tungsten electrode is too Select the correct size
large for the welding
of tungsten electrode.
current.
8.No HF output in HF
mode.
Spark gap points too far
apart.
Set spark gap points
within 4mm.
Other Problems
FAULT
1. No AC output when
chosen “AC”
AC mode
mode.
2. The depth of weld
2
pool is not enough
3. Arc flutters during
TIG welding.
ldi
CAUSE
REMEDY
A. The power board AC
d i control
drive
t l signal
i
l iis
wrong
A. Repair or replace
th power board
the
b
d
B. AC drive board is
damaged
B. Repair or replace
the drive board
C. AC IGBT is damaged
C. Replace the IGBT
The range of welding
current is too small
Increase the preset
value of welding
current
WAVE BALANCE is too
large
Adjust the Balance in
AC MODE
Tungsten electrode is
t llarge f
too
for the
th
welding current.
Select the right size
t
tungsten
t electrode.
l t d
FAULT
CAUSE
REMEDY
Welding current is too high//Reduce the current
Over h
O
heatt
protection
Continuous use time is too much//Reduce the load
continuous rate (use intermittently)
The thermal relay is damaged//Replace the relay
Over voltage
O
lt
P
Power
grid
id is
i unstable//Connect
t bl //C
t into
i t stable
t bl grid
id
protection
4. The
4
red alarm
is on
Power grid is unstable or there is defect of
Under voltage
it//Connect into stable grid
protection
Power grid is stable//Check the power of main
circuit
Over current There is unusual current in main circuit//Check and
protection
repair the main circuit and drive board
All of above
MS2003 is damaged//Replace MS2003 or power
oar
board