WIRING DIAGRAM - PRECISION TIG 185
VOLTAGE RECONNECTION
SEE RATING PLATE FOR SPECIFIC VOLTAGES
230or
H1 and H3 (HIGH) TO POWER SWITCH.
H2 NOT CONNECTED; INSULATE.
208 or 380 or 460 VOLT CONNECTION
H1 and H2 (LOW) TO POWER SWITCH.
H3 NOT CONNECTED; INSULATE.
C1 AND C2 MUST ALWAYS BE CONNECTED
ACROSS TRANSFORMER PRIMARIES
C2
C1
380V AND ABOVE
G
CONNECT GREEN LEAD TOGROUND PER
BNATIONAL AND LOCAL ELECTRICAL CODE
(L1) | CONNECT BLACKAND WHITE LEADS |
WTO SUPPLY CIRCUIT
(L2)
208V/230V ONLY | TO GROUND PER | |
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| NATIONAL ELECTRIC CODE |
INPUT PLUG (208V/230V ONLY)
10K
AT MINIMUM
OPTIONAL
REMOTE
A | A |
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B | B |
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C | C | L5 | |
D | D | ||
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EE
F
REMOTE
W (L2)
B
(L1)
S1
GPOWER SWITCH
H3
H2
H1
313
314
S4
CHOKE
232 | 235 |
236 | 260 |
4 3 2 1
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| 216A |
| 244 | 210 |
| 311 | 204 | 313 |
240 | 245 | 209 | 312 | 201 | 314 | |||
1211 10 9 8 7 6 5 4 3 2 1
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| 217 |
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| 220 | G1 | G3 | |||
G4 |
| G2 | 216 | 218 | ||
8 7 6 5 4 3 2 1
236
P7
J7
4 3 2 1
245 244
R4 R5
AMPTROLTM
RECEPTACLE
| FRONT |
240 | GANG |
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| D |
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| J4 | J3 |
| J2 |
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| AUTO | MODE |
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| BALANCE G | SWITCH |
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| LED |
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| POLARITY SWITCH | MICRO SWITCH |
| G | R | |
AC |
| OPEN | AC | TIG LED | STICK LED | |
DC+ |
| CLOSED | ||||
DC- |
| CLOSED | BALANCE |
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REAR GANG | CONTROL |
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R3 |
236A |
C4 |
231A
237
H3 (HIGH) | |
H2 (LOW) | |
| H1 |
201 | X3 |
TRIGGER | 18VAC |
204 | X4 |
209 | X5 |
POWER | 18VAC |
G4 G3 G2 G1
217
220
220A
SCR1
G1
AC
SCR2
G2 | 218 |
220A 218A
260 231A
AC |
A |
E F |
C |
B |
| H |
| NO |
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| NC 312A | 312 |
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| G | 311A | 311 | PULSE | DIGITAL |
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| S2A | ||||
DC |
| DISPLAY | ||||
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| CONTROL | |||
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| PULSE |
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| G |
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| FREQ |
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| LED |
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1
W 221 |
115VAC
T2
210 | X6 | X8 | 232 |
| X1 | ||
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| 78VAC | 115VAC |
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| X2 | X7 | 231 |
T1
216
216A
G3
218A
)+(
SCR3
X2
FAN
115VAC
PRECISION TIG 185
POS
S2
THERMAL | Y |
LED |
2
R 222 | L4 |
G4 
284
POLARITY
SWITCH
(REAR VIEW, | A | 1 |
| POSTFLOW |
SHOWN IN AC POSITION) |
| CONTROL | ||
C | 2 |
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| B | 3 | J5 | OUTPUT |
| D | 4 | CONTROL | |
285 | 5 |
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E | 6 |
| J6 | |
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CONTROL PC BOARD
1 2 3
4
W221 R 222
SHUNT
POS
SCR4
_
) | ( |
D1
WORK 
L3 L2
L1
DC
231
GAS VALVE
235
SV1
C1,C2 |
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ELECTRODE
239 | 238 |
SPARK
GAP
ARC
STARTER
AS'BLY C3
T3
BYPASS/
STABILIZER
PC BOARD
285
284
284A 284B
R2 
R1
285A 285B
C3 | HIGH VOLTAGE CAPACITOR, .0025/10kV |
C4 | PHASE SHIFT CAPACITOR, 15/250VAC |
C5,C6 | |
CB1 | CIRCUIT BREAKER, 10A |
D1 | FREE WHEELING DIODE |
L1 | OUTPUT INDUCTOR (CHOKE) |
L2,L3 | HIGH 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 |
LEAD COLORING CODE: | COMPONENT VALUE | ||
UNITS: | |||
| RESISTORS: | ||
| OHMS/WATTS | ||
CAPACITORS: | |||
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| MFD/VOLTS |
CONNECTOR PIN NUMBERS: | |||
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| EXAMPLE: THIS IS PIN 7 | |
1 2 3 | 7 | OF CONNECTOR J4 | |
8 | 14 |
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J4 | LATCH |
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VIEW OF CONNECTOR ON PC BOARD ELECTRICAL SYMBOLS PER E1537.
B
G4549
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted inside the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. Give the equipment code number..
DIAGRAMS
ENHANCED
WIRING DIAGRAM