background image

ARC  1 8 5 0 

PRO 

WEL D 

Figure 4 

FUSE BLOCK 

(Dual gun version shown) 

F12

F11

F10

F9

F8

F7

F6

F5

F4

F3

F2

25 AMP

SLO BLO

5 AMP

CERAMIC

1 AMP

1 AMP

1 AMP

1 AMP

1 AMP

25 AMP

SLO BLO

25 AMP

SLO BLO

1 AMP

1 AMP

8.2 Checking Gun Lift  

To measure lift, turn the stud welding unit on and set the timer to 
maximum time. (On certain units there may be a Lift 
Check switch available, and in these cases this switch can be used 
to check lift.) Trigger the gun in the air, or on a 
non-grounded or insulated surface, to observe the lift cycle. Meas-
uring the distance the stud or gun mechanism 
moves equals lift - usually this can be easily done by visual obser-
vation or simple measurement against a static ref- 
erence point (i.e. the ferrule properly seated in the ferrule grip).   

                          Recommended Lift Settings.   

                        Stud Base Dia.     Lift Setting   

                     Less than 1/2”              1/16”  
                     1/2” through 3/4”        3/32”  
                     Greater than 3/4”         7/64”  

When it does become necessary to adjust lift, you do so by       re-
moving the rear cap from the gun. This will expose the 
rear coil yoke assembly, the set screw and the lift adjusting screw 
(Loosen the set screw to avoid damaging the threads 
of the lift adjusting screw).   

To increase lift: turn the lift adjusting screw out (counter clock-
wise).  

To decrease lift: turn the lift adjusting screw in (clockwise).  

Once the lift has been set, tighten the set screw and replace the rear 
cap. 

PAGE  6 

Summary of Contents for ARC 1850

Page 1: ...OPERATION MAINTENANCE MANUAL ...

Page 2: ......

Page 3: ...EL DESCRIPTION 4 8 0 WELD GUN SETUP 5 8 1 PLUNGE LENGTH 5 8 2 CHECKING GUN LIFT 6 9 0 PARTS LIST 7thru13 10 0 TROUBLE SHOOTING 15 LIST OF FIGURES 1 JUMPER LINK ARRANGEMENT 3 2 CONTROL PANEL FRONT 4 3 STANDARD GUN SET UP 5 4 FUSE BLOCK 6 5 CONTROL UNIT FRONT 7 6 CONTROL UNIT REAR 8 7 CONTROL UNIT SIDE VIEW 9 8 RECTIFIER WELD BRIDGE ASSY 10 9 PRINTED CIRCUIT BOARD ENCLOSURE 11 10 GUN TIMER CONTROL P...

Page 4: ...ARC 1850 PRO WELD ...

Page 5: ...ARC 1850 PRO WELD ...

Page 6: ...ARC 1850 PRO WELD ...

Page 7: ...ARC 1850 PRO WELD ...

Page 8: ...s to the manufacturer s 3 0 UNPACKING YOUR UNIT Upon receipt of your unit place it as close as possible to the point of installation before unpacking it Once the unit is un packed it is recommended that you inspect it for any physi cal damage that may have occurred in shipping Your unit has been completely assembled and inspected at the factory Upon receipt the unit must be hooked up to the recomm...

Page 9: ...meters A specially designed electronic gun control circuit has been incorporated in this system If a fault condition occurs due to a shorted gun solenoid or a faulty control cable the circuit will prevent gun triggering and eliminate damage to printed circuit boards The ARC 1850 system is capable of welding studs from 12ga to 3 4 diameter with precision and repeatability 6 0 ELECTRICAL INPUT REQUI...

Page 10: ... 6 5 4 3 2 6 5 4 3 2 1 L3 L2 L1 6 5 4 3 2 1 1 6 5 4 3 2 1 6 5 4 3 2 6 5 4 3 2 1 L3 L2 L1 6 5 4 3 2 1 1 6 5 4 3 2 1 6 5 4 3 2 6 5 4 3 2 1 460V 575V Jumper Link connections CAUTION The stud labeled GND is connected to the unit chassis and is for grounding purposes only Do not connect a wire from the terminal labeled GND to one of the three phase line terminals as this may result in hot power unit ch...

Page 11: ... control knob until the digital meter displays the desired time Return setup switch to WELD before attempting to weld The weld time is adjustable from 1 to 1 6 seconds WELD CURRENT ADJUSTMENT Select SETUP CURRENT and adjust the current control knob until the digital meter displays the desired current Re turn setup switch to WELD before attempting to weld Weld current is adjustable from 100 to 1900...

Page 12: ...nge the stud during the welding process Lift is the distance the gun will raise the stud above the welding surface during the weld This distance governs the voltage and the arc Im proper lift will cause unsatisfactory welds Refer to para graph 8 1 if it becomes necessary to ad 5 Make sure that the cables are connected to the power source standard set up is straight polarity Negative to con troller...

Page 13: ...ves equals lift usually this can be easily done by visual obser vation or simple measurement against a static ref erence point i e the ferrule properly seated in the ferrule grip Recommended Lift Settings Stud Base Dia Lift Setting Less than 1 2 1 16 1 2 through 3 4 3 32 Greater than 3 4 7 64 When it does become necessary to adjust lift you do so by re moving the rear cap from the gun This will ex...

Page 14: ...tor 104 0016 2 N O Contact 104 0017 2 N C Contact 104 0018 3 Power Light Green Neon 102 0087 4 Knob 102 0060 4 20k Potentiometer 111 0012 5 Red LED 108 0028 6 Panel Meter 103 0004 7 Green LED 108 0029 8 Amber LED 108 0030 9 Positive Output Terminal 102 0058 10 4 Pole Panel Mounted Connector 107 0001 9 10 11 1 6 7 5 2 3 4 8 PAGE 7 ...

Page 15: ... 6 Control Unit Rear 12 13 14 15 16 9 0 PARTS LIST ITEM DESCRIPTION PART NUMBER 12 Fuse 6 amp 600 volt 102 0007 13 Control Transformer 105 0015 14 Fan Blade 14 102 0083 15 Fan Motor 102 0085 16 Start Contactor 113 0017 PAGE 8 ...

Page 16: ...ARC 1850 PRO WELD Figure 7 Control Unit Side View 18 17 FRONT OF UNIT 9 0 PARTS LIST ITEM DESCRIPTION PART NUMBER 17 Main Transformer 105 0023 18 Shunt 102 0107 PAGE 9 ...

Page 17: ... 1850 PRO WELD Figure 8 RECTIFIER SCR ASSEMBLY SIDE AND TOP VIEW 9 0 PARTS LIST ITEM DESCRIPTION PART NUMBER 19 Weld SCR Thermostat 102 0032 20 Weld SCR Clamp 102 0109 21 Weld SCR 108 0058 19 20 21 PAGE 10 ...

Page 18: ...00 0010 24 Current Control P C Board 600 0012 25 Monitor Control P C Board 600 0011 26 Time Control P C Board 600 0010 27 Fuse Block 104 0015 28 Sustaining arc SCR 108 0042 29 Gun Discharge Capacitor 106 0024 Front of Unit Figure 9 Printed Circuit Board Enclosure Top and Side View 22 23 24 25 26 27 28 29 PAGE 11 ...

Page 19: ...04 V108 R115 R141 R142 OP101 V103 D102 R103 R155 V111 D111 D139 OP104 R126 R127 R153 D124 ZD105 D127 C108 R139 R138 C110 R104 C109 R129 R120 V105 R137 OP 109 OP 105 C111 R149 R143 C103 R136 R135 R150 R134 C112 D140 OP 102 R102 R101 R110 R109 R108 R140 C101 D101 D133 D132 D135 D134 D138 R151 Q101 D107 D108 D106 D105 ZD103 ZD104 V102 R107 D121 R113 R105 IC101 R146 D109 VR101 R111 R154 OP 103 OP110 C...

Page 20: ...13 R210 IC202 R207 R208 R209 R204 OP201 OP202 C204 C203 R215 OP205 OP207 OP213 OP209 C205 OP204 C206 D204 V202 R217 R216 D202 D203 R218 D207 OP208 R221 R220 V204 V203 R219 R234 OP210 ZD202 D209 OP206 R223 D205 D206 R225 V205 R224 D207 C208 R227 V206 V207 OP212 OP211 C207 R222 R235 D210 ZD203 D208 R228 R229 R230 VR201 ZD201 R232 R233 R201 R205 R214 ...

Page 21: ...6 R330 R325 R346 R337 IC307 R344 R334 C309 R305 C310 R348 R326 R320 C304 ZD304 R316 R319 C303 D315 D310 R313 ZD303 ZD302 R312 C302 D305 ZD301 R309 C305 IC306 R301 D302 D301 D303 D304 D308 D309 D314 D306 D307 R303 D312 D311 R342 OP301 R340 ZD305 D328 D320 R339 R336 R338 R335 V301 IC305 Q301 C308 TR301 V302 R341 D321 V305 V303 R328 R327 R333 R350 D326 D327 OP303 OP302 R349 D324 D325 D323 D322 C301 C...

Page 22: ...ve 600 0012 P C board 1 Replace no control 2 Open lead going to shunt 2 Repair broken leads on shielded cable connection 3 Defective current potentiometer 3 Replace Gun does not lift 1 Blown 5 amp fuse 1 Check and replace fuse 2 Defective 600 0010 P C board 2 Replace 3 Defective control cable or 3 Repair short in cable replace gun coil gun coil 4 Defective 600 0012 P C board 4 Replace 5 Defective ...

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Page 24: ...WELD PRO MANUFACTURED BY MADE IN THE U S A ...

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