Lincoln Electric IM892-C manual Figure B.22

B-46 OPERATION B-46

EXAMPLE 4 – 4 STEP TRIGGER: Trigger Interlock The 4 step trigger can be configured as a trigger inter- lock. Trigger interlock adds to the welder’s comfort when making long welds by allowing the trigger to be released after an initial trigger pull. Welding stops when the trigger is pulled a second time and then released, or if the arc is interrupted. (See Figure B.22)

For this sequence,

PREFLOW:

Shielding gas begins to flow immediately when the gun trigger is pulled.

RUN-IN:

After preflow time expires, the power source regulates to the welding output and wire is advanced towards the work piece at the Run-In WFS. If an arc is not established within 1.5 seconds, the wire feed speed will jump to the welding wire feed speed.

WELD:

The power source output and the wire feed speed continue at the weld settings. Welding continues when the trigger is pulled a second time.

POSTFLOW:

As soon as the trigger is released for the second time, the power source output and the wire feed speed are turned OFF. Shielding gas flows until the post flow timer expires.

FIGURE B.22

			Trigger Pulled		Arc Established
		Idle Preflow		Strike
Shielding On
Gas	Off
Power	Weld
				1. 5sec ma		x.
Source	Start
Output	Crater
	Off
WFS	Weld
	Crater
	Run-in
	Off

Trigger Released

4Step Trigger Start = OFF Crater = OFF Burnback = OFF

Weld

Trigger Pulled

Trigger Released

Burnback Postflow Idle

POWER FEED™ 25M