Lincoln Electric SVM172-A service manual Step / 4 Step Operation

BB-14 OPERATION BB-14

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Recalling from Memory

To recall the contents of a memory into the active proce- dure, momentarily push the desired memory button (for less than 2 seconds). The saved parameters will be copied into the active procedure, and the LED of the memory button will light indicating the source of the infor- mation. As with saving to memory, this light will remain lit as long as the contents of the source memory remain equal to the contents of the associated procedure.

If a constant current mode is saved to memory with the power source in the "on" state, the "on" status will be changed to "off" when the procedure is recalled. This pre- vents a potential safety hazard if a memory button is pushed and the power source unexpectedly turns on.

2 STEP / 4 STEP OPERATION

The Wire Drive has a 2 Step / 4 Step switch located near the gun connector. 2-Step Trigger Mode operation requires the operator hold the gun trigger closed in order to weld. 4-Step Trigger Mode eliminates the need to hold the gun trigger closed while welding. User- selectable 4-step modes with or without current inter- lock. The switch in the down position will enable 2-Step operation and in the up position enables 4 -Step oper- ation. This switch has no effect in CC modes of opera- tion, such as stick welding. Both 2 and 4 -Step can be operated in Synergic and Non-Synergic modes. In a Synergic mode, machine output tracks Wire Feed Speed (WFS) during welding. In Non-Synergic modes, machine output is independent of WFS.

2 Step Synergic Operation:

Without Start/Crater/Burnback functions active

Waveform Sequence:

1.Trigger is pulled; Preflow sequence begins and runs until preflow timer expires.

2.Strike sequence initiates until Arc is established.

3.Arc established; Weld sequence begins.

4.Trigger released (Arc extinguished); Postflow sequence begins and runs until postflow timer expires.

5.End of sequence.

2 Step Synergic Operation: With Burnback function active.

Waveform Sequence:

1.Trigger is pulled; Preflow sequence begins and runs until preflow timer expires.

2.Run-In sequence initiates until Arc is established.

3.Arc established; Weld sequence begins.

4.Trigger released (Arc extinguished); Burnback sequence begins and runs until burnback timer expires.

5.Postflow sequence begins and runs until postflow timer expires.

6.End of sequence.

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WFS vs. Work point (Output) Waveform

= solid line represents WFS

---= dashed line represents Work point or Machine Output

2 Step Synergic Operation:

With Start/Crater/Burnback functions active.

Waveform Sequence:

1.Trigger is pulled; Preflow sequence begins and runs until preflow timer expires.

2.Run-In sequence initiates until Arc is established.

3.Arc established; Start sequence begins and runs for the amount of time set.

4.Weld sequence begins.

5.Trigger released; Crater sequence begins and runs until crater timer expires.

6.Arc Extinguished; Burnback sequence begins and runs until burnback timer expires.

7.Postflow sequence begins and runs until postflow timer expires.

8.End of process.

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WFS vs. Work point (Output) Waveform

= solid line represents WFS

WFS vs. Work point Waveform---= dashed line represents Work point or Machine Output = solid line represents WFS

---= dashed line represents Work point or Machine Output

POWER FEED 10M SINGLE/DUAL