Lincoln Electric SVM118-A service manual Crater Fill Controls

B-9 B-9

OPERATION

Return to Section TOC

Return to Section TOC

Section TOC

Return to Master TOC

Return to Master TOC

Master TOC

Example: The Peak Current control is preset at 50 amps and the Amptrol is partially down, giving a peak current of 30 amps. If the Background Current control is set at 50%, the Background (low pulse) current will be 15 amps.

The Amptrol raises and lowers the Peak current. Since Background current is always a percentage of Peak current, the Amptrol also raises and low- ers the Background current.

Pulse % On — Controls the percentage of the pulse cycle that is at the Peak current.

Example: You are pulsing at 1 Pulse per second with a 30% Pulse % On setting. The welding cur- rent would be at the Peak current for 0.3 seconds and at the Background current for the remainder of the cycle, 0.7 seconds.

16.CRATER FILL CONTROLS

Use the Crater Fill controls to automatically control current fade-out at the end of a weld. LOCAL cur- rent control (Item 1) MUST be used when Crater Fill is used.

Crater Fill Switch — A two-position toggle switch.

ON: Crater Fill Fade-out will begin when the Arc Start Switch or Amptrol is released (2-Step mode) or pressed and released a second time (4-Step mode). If used with Spot Time (item 13), Crater Fill begins at the end of the Spot Time. The current control (item 1) switch must be in LOCAL when using Crater Fill.

OFF: Locks out Crater Fill controls.

Fade-out Control — Controls how slowly the cur- rent fades out. The FAST setting will cause current to ramp down from the welding current toward 2 amps in approximately 1/2 second; the SLOW set- ting, in approximately 20 seconds. The time for downslope to the Crater Fill Current level depends on the difference between the weld current and the Crater Fill Current.

Crater Fill % Peak Current Control — Controls the final Crater Fill current from zero to 100% of the weld current preset on the Peak Current con- trol.

Example: WIth a Crater Fill % Current setting of 20% and a weld current preset at 100 amps, the current will fade from 100 amps to 20 amps and then dwell at 20 amps for about 1-1/2 seconds before the arc goes out.

The final Crater Fill current dwell time is approxi- mately 1-1/2 seconds, regardless of Crater Fill control settings.

17.STATUS INDICATOR LEDs — Seven Light Emitting Diodes (LEDs) which light when their function is active.

•GAS & WATER LED is on when the solenoid valves are open, from the beginning of Preflow to the end of Afterflow.

•HIGH FREQUENCY LED is on when the high frequency circuit is on.

Return to

Return to Section TOC

Return to

Return to Master TOC

FIGURE B.2 – STATUS INDICATOR LIGHT SEQUENCE

SQUARE WAVE TIG 355

SQUARE WAVE TIG 355