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F-31

F-31

TROUBLESHOOTING & REPAIR

TRIGGER CIRCUIT TEST (continued)

FIGURE F.9 – SIMPLIFIED TRIGGER CIRCUIT DIAGRAM

SIMPLIFIED TRIGGER CIRCUIT

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TORCH

 

 

RECEPTACLE

 

 

9

#4

 

 

TRIGGER SWITCH

 

 

IN TORCH HANDLE

1

#2

 

OUTPUT BOARD

+17VDC

 

 

1J31

 

 

2J31

 

 

 

3J32

#344

D25

14J32

#312

 

 

AUX

COM

 

CONTROL BOARD

+15VDC

 

 

P

 

R

 

O

 

C

 

E

11J3

S

 

S

 

O

 

R

12J3

 

COM

 

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PROCEDURE

1.Remove input power to the PRO-CUT 80 machine.

2.Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.

3.Locate the torch cable receptacle and leads #2 and #4. See Figure F.9, the Simplified Trigger Circuit Diagram. These leads are best accessed at plug J31 on the output board. See Figure F.10.

7.If the correct voltage is present in Step 6, carefully check for the presence of approxi- mately 15 VDC from plug J32 pin-3 (lead#354) (positive) to plug J32 pin-14 (lead#312) (negative). See Figure F.10. Also see Control Board LED Definitions and related figures. If the correct voltage is not present, perform the Low Voltage Circuit

Test.

8.If the correct voltage is present in the above test, carefully pull the torch trigger.

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4.Using the ohmmeter, check for continuity (less than one ohm) from lead #2 to lead #4. The torch trigger must be pulled and all input power removed from the machine. If conti- nuity (less than one ohm) is not read, check the leads from plug J31 to the torch cable receptacle. Perform the Torch Continuity and Solenoid Test.

5.If less than one ohm is read (only when the torch trigger is pulled), proceed to the next step. Also see Output Board LED Definitions and related figures.

6.Apply the correct input power to the PRO- CUT 80. Carefully check for approximately 17 VDC from plug J31 pin-1(lead#4) (positive) to plug J31 pin-2 (lead#2) (negative). See Figure F.10. If the correct voltage is not pre- sent, perform the Low Voltage Circuit Test. Also see Output Board LED Definitions and related figures.

WARNING

PILOT ARC, CUTTING ARC, AND HIGH VOLT-

AGE MAY BE PRESENT AT THE TORCH HEAD. Perform this test with the air input removed to avoid a pilot arc at the torch.

PRO-CUT 80

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Lincoln Electric SVM146-A service manual Trigger Circuit Test, Simplified Trigger Circuit
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SVM146-A specifications

Lincoln Electric's SVM146-A is a versatile and powerful multi-process welding machine designed for professionals in various industries. Known for its robustness and reliability, this machine excels in both performance and user-friendly features, making it a popular choice among welders.

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In conclusion, Lincoln Electric's SVM146-A stands out as a multi-process welding machine that combines advanced technology, robust design, and user-friendly features. It is engineered for performance and reliability, making it an excellent investment for professionals dedicated to achieving high-quality welds.
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