ELECTRICAL DIAGRAMS
G-4
PRECISION TIG 375
WIRING DIAGRAM - ENTIRE MACHINE - CODE 10894 (G4047-2)
RECEPTACLE
C
A
B
B
CONTROL PC BOARD
10K A-B
F
E
D
C
AT MINIMUM
D
F
A
E
REMOTE
A
B
C
D
E
F
R4
R1
R2
BALANCE
MINIMUM
OUTPUT
MAXIMUM
OUTPUT
MODE
REMOTE
R3
POST FLOW
31
9
5
4
3
2
1
32
2
31
6C
31
3C
31
6B
31
5
31
6
31
7
31
1
31
2
31
3
31
8
313A
313B
TIG
STICK
8
4
1
2
3
6
5
6
32
1
12
11
10
9
8
6
5
4
3
1
2
6
5
4
3
2
1
2
3
4
5
7
1
5
4
3
2
1
6
6
301
303
304B
306
302
METER
(VIEWED FROM REAR)
DISPLAY
31
4
32
0
LOCAL
31
1A
31
6A
8
7
6
5
4
3
2
1
J23
J22
7
31
6C
301
302
303
304
304A
306
30
4B
321
322
313
314
315
316
317
318
319
320
311
312
J8
J9
2
1
W 221
R 222
11
3
10
2
269
270
271
220B
6
5
4
3
2
1
233A
235
16
8
15
7
14
4
13
5
12
6
9
1
J11
L8
J5
J12
J6
N.A.
8
6
2
3
4
5
7
1
J5A
N.B.
25
5
25
6
256
260
255
236
PROTECTION PCB
R12
R11
R10
R9
FREQ
ON TIME
DOWN SLOPE
BACKGROUND
40
1D
PULSE
2-STEP
40
2
40
3
40
5
40
6
40
1
40
8
40
9
41
0
40
1B
40
7
ADVANCED CONTROL PANEL
40
4
ON
OFF
401C
41
1
40
1A
40
1D
VIEW OF CONNECTOR ON PC BOARD
ELECTRICAL SYMBOLS PER E1537.
OHMS/WATTS
COMPONENT VALUE
UNITS:
RESISTORS:
MFD/VOLTS
CAPACITORS:
8
LATCH
0F CONNECTOR J5
EXAMPLE: THIS IS PIN 7
3
2
LEAD COLORING CODE:
B-BLACK
2
1
8
G-GREEN
O-ORANGE
R-RED
CONNECTOR PIN NUMBERS:
7
14
U-BLUE
Y-YELLOW
W-WHITE
1
3
J5
C1
RECONNECT PANEL
H4
H2
H3
H1
CAPACITORS
POWER FACTOR
C2
HIGH
MID
LOW
COM
25
1
F
W209
18VAC
X7
R210
201
X8
F
S
X5
X2
X1
T1
78VAC
S
204
115VAC
X9
X10
20VAC
X3
X6
26
2
263
63.5VAC
267
268
CR4
231A
231
115VAC
X4
CB1
15A
232
231
S
F
S
F
S
CR4
233B
234
4
8
2
6
233
0
1
23
3A
X13
22
3
231B
C8
C9
R8
267
233A
231A
268
269
220B
271
270
220A
262
263
201
204
W209
220C
231B
115VAC
ARC STARTER AS'BLY
R5
SV1
GAS VALVE
L3
C6
T2
C7
T3
GAP
SPARK
L2
237
S
F
R6
BYPASS/
STABILIZER
PC BOARD
FAN
260
235
233A
23
9
23
8
284
285
236B
23
6
231D
231E
5
8
CR3
CR2
258
257
CR3
CR2
23
1C
3
9
B
A
B
A
FAN
23
1A
23
1E
231B
23
3A
25
5
25
6
CR3
CR3
CR3
220C
AC BOOST
DC BOOST
3
9
26
0A
23
1F
R13
HI-FREQ
INTENSITY
23
8A
24
0
POS
D
FRONT GANG
N
E
G
POLARITY SWITCH MICRO SWITCH
POLARITY
S2
NO
(REAR VIEW, SHOWN
X2
NC
MICRO-SWITCH
CLOSED
CLOSED
OPEN
TO GROUND PER
C
A-C, D-E, B-F
B-D, C-E, A-F, G-H
G
DC+
REAR GANG
DC-
26
6A
S2A
26
5A
H
A
L1
AC
SWITCH
E
F
ELECTRICAL CODE
NATIONAL
25
3
POS
B-D, A-E, C-F, G-H
IN AC POSITION)
D2
B
25
2
R7
28
6
W
22
1
R
22
2
271A
22
8
22
8
BACKGROUND
RECTIFIER
26
5
26
6
4
7
5
8
7
4
R14
22
3
22
4
226
225
227
CR2
CR3
225A
22
8
227A
OCV BOOST
RECTIFIER
213
214
201
204
W209
R210
262
263
265
266
252
253
G1
G2
217
216
220
G3
22
0A
G4
218
SCR4 D1
X1
N
E
G
SCR3
POS
(+)
SCR1
SCR2
25
2
(-)
B
22
4
G4047-2
A
N.A. CONNECTION IS PIN TO PIN BETWEEN J23 AND J5.
N.B. ROBOTIC INTERFACE CONNECTION.
N.C. DISPLAY TOGGLE SHOWN IN MIN AMP POSITION.
N.D. PLUGS INTO LOWER SWITCHED RECEPTACLE.
PRECISION TIG 375 WIRING DIAGRAM
L9
L10
L6
L5
L4
L13
L11
411
W
403
404
405
406
407
408
409
410
401
402
T
IG
O
P
T
IO
N
P
C
B
J1
06/
17/
20
02
1
3 4 5 6
8 9 10
7
2
1
3 4 5 6
8 9 10
7
J2
C3
FRONT
ELECTRODE
REAR
ELECTRODE
WORK
212
214
213
215
TRANSFORMER
PRIMARY
THERMOSTAT
TRANSFORMER
SECONDARY
THERMOSTAT
MICRO-
SWITCH
223
4-STEP
TRIGGER
40
1B
31
1A
31
6A
31
6B
F
C
S
E
N.C.
CONTROL PANEL (VIEWED FROM REAR)
+
-
G
R
G
Y
(STICK)
(AUTO BAL)
(REMOTE)
(P. FLOW)
(THERMAL)
B
W
+
-
B
W
+
-
B
W
+
-
B
W
+
-
G
33
1
5
9
8
3
7
2
1
6
4
331
10
J10
L7
33
2
33
3
B
W
33
4
33
5
B
W
332
B
W
333
B
W
334
B
W
335
B
W
12
11
10
9
8
6
5
4
3
1
2
7
REMOTE
TM
AMPTROL
OPTIONAL
GROUND
25
0A
25
1A
S1A
H1
S1
POWER SWITCH
L1 (U)
L2 (V)
X1
X1
212
8
7
6
5
4
3
2
1
220
G1
217
J4
5
2
1
3
J7
G4
G3
G2
L12
6
4
10
9
216
218
J3
415 VOLT CONNECTION
CONNECT STRAP TO
HIGH (H4) (AS SHOWN)
CONNECT STRAP TO
MID (H3)
06/17/2002
105VAC
F X14
52
52
CB2
5A
51
50
50A
C1,C2,C3
POWER FACTOR CAPACITORS, 60/460
C4,C5
BY-PASS CAPACITORS, .0047
C6
HIGH VOLTAGE CAPACITOR, .0015/12kV
C7
PHASE SHIFT CAPACITOR, 15uF/250VAC
C8,C9
HIGH FREQ PROTECTION CAPACITORS, .22/400
CB1
CIRCUIT BREAKER, 15 AMP
CB2
CIRCUIT BREAKER, 5 AMP
CR2,CR3
120V AC RELAY COIL
CR4
12V DC RELAY COIL
D1
FREE WHEELING DIODE
D2
BACKGROUND DIODE
L1
OUTPUT INDUCTOR (CHOKE)
L2,L3
HIGH FREQ INDUCTORS
L4 -L13
RF TOROID CHOKES
R1
OUTPUT CONTROL POTENTIOMETER, 10K
R2
BALANCE CONTROL POTENTIOMETER, 10K
R3
POST FLOW POTENTIOMETER, 10K
R4
MIN OUTPUT POTENTIOMETER, 10K
R5
PHASE SHIFT RESISTOR, 200/100
R6
HOLDING RESISTOR, 50/225
R7
RESISTOR, 20/100
R8
RESISTOR, 5/50
R9
FREQ CONTROL POTENTIOMETER, 10K
R10
ON TIME CONTROL POTENTIOMETER, 10K
R11
BACKGROUND POTENTIOMETER, 10K
R12
DOWN SLOPE POTENTIOMETER, 10K
R13
HIGH FREQ INTENSITY CONTROL, 3/25
R14
RESISTOR, 8/300
S1
INPUT POWER SWITCH
S1A
MICROSWITCH ON INPUT POWER SWITCH
S2
POLARITY SWITCH
S2A
MICROSWITCH ON POLARITY SWITCH
SCR1,2,3,4 MAIN POWER SCR'S
SV1
GAS SOLENOID VALVE, 115VAC
SV2
WATER SOLENOID VALVE, 115VAC (OPTIONAL)
T1
MAIN TRANSFORMER
T2
HIGH VOLTAGE TRANSFORMER
T3
HIGH FREQ TRANSFORMER
220VAC
232
50A
SV2
WATER VALVE
(OPTIONAL)
N.D.
H5 (440V)
H4 (415V)
H2 (220V)
H3 (380V)
250
A
250
R210
G
(PULSE ON)
+
-
W
B
L1 (U)
L2 (V)
L1A
L2A
BYPASS
PC BOARD
TO GROUND PER
NATIONAL
ELECTRIC CODE
GND4
GND5
GND1
RECONNECT PANEL SUPPORT
T1
TRANS.
FOOT
CASE
BACK
CASE
FRONT
CONTROL
PANEL
115 VAC
RECEPT.
GAS
VALVE
GND6
PROTECTIVE BONDING CIRCUIT
220 VAC
RECEPT.
380-400 VOLT CONNECTION
220-230 VOLT CONNECTION
GND-H2
GND-H
CONNECT STRAP TO
LOW (H2)
G-4
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.