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ELECTRICAL DIAGRAMS
G-2
PRECISION TIG 185
WIRING DIAGRAM - ENTIRE MACHINE - (G4549)
G4549
B
SCR4
SCR2
SCR1
D
C
B
A
REAR GANG
L1
ELECTRODE
T3
NC
NO
MICRO-SWITCH
T2
L2
L3
C3
SCR3
H1
H
G
311A
312A
OPEN
CLOSED
CLOSED
G4
216
G3
2
1
8
G2
G1
217
220
AC
E
F
PC BOARD
CONTROL PC BOARD
D1
S2
SV1
GAS VALVE
S2A
BYPASS/
STABILIZER
H1
X1
X2
R 222
W 221
WORK
R2
ARC
STARTER
AS'BLY
237
C4
R3
231
235
J3
236A
SPARK
GAP
284A
285A
AC
DC+
DC-
A-C, D-E, B-F
B-D, C-E, A-F, G-H
B-D, A-E, C-F, G-H
POLARITY SWITCH MICRO SWITCH
(REAR VIEW,
SHOWN IN AC POSITION)
115VAC
18VAC
18VAC
78VAC
T1
POLARITY
SWITCH
H3
H2
H3 (HIGH)
H2 (LOW)
L4
POS
X4
X5
X3
X6
X7
X8
C2
C1
201
204
209
210
231
232
AUTO
BALANCE
LED
PULSE
FREQ
LED
AC
BALANCE
CONTROL
PULSE
CONTROL
POSTFLOW
CONTROL
STICK LED
TIG LED
DIGITAL
DISPLAY
THERMAL
LED
OUTPUT
CONTROL
MODE
SWITCH
B
(L1)
W
(L2)
POWER
SWITCH
S1
G
FAN
115VAC
+
( )
( )
_
DC
115VAC
238
239
210
209
201
313
314
1
2
3
4
6
5
7
11
12
R 222
W 221
1
2
89
10
RECEPTACLE
C
A
B
B
10K A-B
F
E
D
C
AT MINIMUM
D
REMOTE
TM
AMPTROL
OPTIONAL
A
E
REMOTE
J2
J1
A
1
J5
2
3
4
5
6
C
B
D
E
216A
2
4
0
L5
204
236
231A
260
R4
220A
245
R5
218A
244
TRIGGER
POWER
R1
284B
285B
285
2
8
4
AC
X2
FRONT
GANG
RG
G
G
Y
220A
218A
231A
J4
3
1
1
3
1
2
2
4
5
2
4
4
2
1
6
A
2
4
0
314
S4
CHOKE
313
SEE RATING PLATE FOR SPECIFIC VOLTAGES
230
or 400-415
or 575
VOLT CONNEC
TIO
N
H1 and H3 (HIGH) TO POWER SWITCH.
208
or 380
or 460 VOLT C
ONNEC
TIO
N
H1 and H2 (LOW) TO POWER SWITCH.
H3 NOT CONNECTED; INSULATE.
H2 NOT CONNECTED; INSULATE.
C1 AND C2 MUST ALWAYS BE CONNECTED
ACROSS TRANSFORMER PRIMARIES
VOLTAGE RECONNECTION
(AS SHOWN & AS SHIPPED FROM FACTORY)
B-BLACK R-RED
G-GREEN W-WHITE
LEAD COLORING CODE:
CONNECTOR PIN NUMBERS:
VIEW OF CONNECTOR ON PC BOARD
123 7
8
14
LATCH
EXAMPLE: THIS IS PIN 7
OF CONNECTOR J4
COMPONENT VALUE
UNITS:
RESISTORS:
CAPACITORS:
OHMS/WATTS
MFD/VOLTS
J4
ELECTRICAL SYMBOLS PER E1537.
C1,C2 BY-PASS CAPACITORS, .0047/250VAC
C3 HIGH VOLTAGE CAPACITOR, .0025/10kV
C4 PHASE SHIFT CAPACITOR, 15/250VAC
C5,C6 BY-PASS CAPACITORS, .22/400VDC
CB1CIRCUIT BREAKER, 10A
D1 FREE WHEELING DIODE
L1 OUTPUT INDUCTOR (CHOKE)
L2,L3HIGH FREQUENCY INDUCTORS
L4,L5 RF TOROID CHOKES
R1,R2 HOLDING RESISTORS, 100/100W
R3 PHASE SHIFT RESISTOR, 200/100W
R4,R5 MICRO START RESISTORS, 12/100W
S1 INPUT POWER SWITCH
S2 POLARITY SWITCH
S2A MICROSWITCH ON POLARITY SWITCH
S4 MAIN CHOKE THERMOSTAT
SCR1,2,3,4 MAIN POWER SCR'S
SV1 GAS SOLENOID VALVE, 115VAC
T1 MAIN TRANSFORMER
T2 HIGH VOLTAGE TRANSFORMER
T3 HIGH FREQUENCY TRANSFORMER
4
3
2
1
2
3
5
2
6
0
G
4
2
2
0
G
2
G
1
2
1
6
G
3
2
1
8
2
1
7
1
2
3
45
6
7
8
DC
POS
SHUNT
X
1
2
3
6
2
3
2
I
N
PU
T
P
LU
G (208V
/
2
30V O
N
LY
)
TO GROUND PER
NATIONAL ELECTRIC CODE
285
284
G
4
G
2
1
2
3
4
G
3
G
1
P7
J7
1
2
3
J6
4
CONNECT GREEN LEAD TO GROUND PER
NATIONAL AND LOCAL ELECTRICAL CODE
CONNECT BLACK AND WHITE LEADS
TO SUPPLY CIRCUIT
B
(L1)
W
(L2)
G
3
80
V AND ABOVE
208V/23
0
V
O
NLY
311
312
G-2
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.
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