Lincoln Electric IM491-B manual Check to see that the torch is hooked to

Page 19

SYMPTOM

 

CHECK

The “SAFETY” LED is lit.

1.

The machine will not operate. The machine

 

 

senses that the shield cup is not in place, or the

 

 

operators could be exposed to dangerous

 

 

voltages if the machine were allowed to operate.

 

2.

Check the shield cup to be sure it is tightly in place.

 

3.

Check the torch consumables to see if they are

 

 

melted together or are simply touching each

 

 

other. Tighten, clean or replace. See

 

 

“Suggestions for Extra Utility from the Pro-Cut

 

 

System”.

 

4.

Check the torch cable to see if it is cut or

 

 

punctured. Replace.

 

5.

Check to see that the torch is hooked to the

 

 

machine properly.

 

6.

Push the ‘SAFETY RESET” button, the LED

 

 

should go out.

 

7.

This circuit rarely trips on power up or because

 

 

of noise. If the circuit can be reset, it is OK to

 

 

continue operation.

 

8.

Replace Control PC board, as this is a

 

 

safety problem.

 

 

 

The “OUTPUT ON” and “MALFUNCTION” LED’s

1.

The pilot arc duty cycle has been exceeded.

blink in alternating order.

 

The machine will cool down and the lights will

 

 

quit blinking in about 10 seconds. The pilot arc

 

 

is limited to 20 out of 80 seconds except in

 

 

special circumstances such as cutting

 

 

expanded metal. (See the section on expanded

 

 

metal in the Operating Section.)

 

 

 

Airflow will not shut off.

1.

Check harness 1J7 (332) and 3J7 (333) 24VAC

 

 

auxiliary supply.

 

2.

Replace Control PC board.

 

 

 

No OCV when 2 and 4 are closed.

1.

Check CR1.

 

2.

230 VAC across CR1.

 

3.

250V SCR PC board positive/negative

 

4.

Check across 31/32 for 110 VAC.

 

5.

Replace Control PC board.

 

 

 

 

 

 

 

 

 

– 19 –

Image 19
Contents PRO-CUT Electric Shock can kill Plasma ARC can injure Sûreté Pour Soudage a L’Arc Précautions DE SûretéTable of Contents Please Examine Carton and Equipment For Damage Immediately Specifications Product Description Preheat Temperature for Plasma CuttingUser Responsibility High Frequency Interference Protection LocationElectric Shock can kill Electrical Input ConnectionTorch Connection Output ConnectionsSequence of events Material thickness below .75 19mm Procedure RecommendationsPilot Arc Discussion GeneralMaterial Thickness above .75 19mm Expanded MetalGouging Suggestions for Extra Utility from the PRO-CUT System All CasesTighten the Electrode Electrical Shock can Kill Routine MaintenanceTroubleshooting Guide Visual InspectionSymptom Check Symptom Check Symptom Check Check to see that the torch is hooked to Status Lights Condition Suggestions PRO-CUT 125 Status Lights Operating ModesSafety Procedure for Replacing PC Boards Electric Shock can Kill Page PCT 125 AMP Plasma Torch PCT 125 AMP Plasma Torch General Assembly PRO-CUT 125 Three Phase Parts List P-207-C.1 L8348 28-93 Case Back AssemblySolenoid Assembly S18669-1 28-93B Regulator and Filter AssemblyInput BOX Assembly R K HI Freq Board AssemblyCase Front Assembly Single Voltage Plasma Torch Connection Diagram For Lincoln Electric Torches Wiring Diagram PRO-CUT Basic Course How To Read Shop DrawingsNew Lessons in Arc Welding Need Welding Training?Precaucion Warnung