Lincoln Electric 400 service manual Wire Feeder Voltmeter Switch, Table B.1

Provides a connection point for the electrode and

B-4 THEORY OF OPERATION B-4

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4.ARC CONTROL- The ARC CONTROL dial is active in the CV-WIRE, CC-STICK and DOWNHILL PIPE modes, and has different functions in these modes. This control is not active in the TIG mode.

CC-STICK mode: In this mode, the ARC CONTROL dial sets the short circuit current (arc-force) during stick welding to adjust for a soft or crisp arc. Increasing the dial from –10 (soft) to +10 (crisp) increases the short circuit current and prevents sticking of the electrode to the plate while welding. This can also increase spatter. It is recommended that the ARC CONTROL be set to the minimum number without electrode sticking. Start with a setting at 0.

DOWNHILL PIPE mode: In this mode, the ARC CONTROL dial sets the short circuit current (arc-force) during stick weld- ing to adjust for a soft or a more forceful digging arc (crisp). Increasing the number from –10 (soft) to +10 (crisp) increas- es the short circuit current which results in a more forceful digging arc. Typically a forceful digging arc is preferred for root and hot passes. A softer arc is preferred for fill and cap passes where weld puddle control and deposition ("stacking" of iron) are key to fast travel speeds. It is recommended that the ARC CONTROL be set initially at 0.

CV-WIRE mode: In this mode, turning the ARC CONTROL clock wise from –10 (soft) to +10 (crisp) changes the arc from soft and washed-in to crisp and narrow. It acts as an induc- tance/pinch control. The proper setting depends on the pro- cedure and operator preference. Start with a setting of 0.

5. WELD OUTPUT TERMINALS WITH FLANGE NUT-

work cables.

6.GROUND STUD- Provides a connection point for connecting the machine case to earth ground.

7.14-PIN CONNECTOR- For attaching wire feeder con- trol cables. Includes contactor closure circuit, auto-sensing remote control circuit, and 120V and 42V power. The remote control circuit operates the same as the 6 Pin Amphenol.

8.6-PIN CONNECTOR- For attaching optional remote control equipment. Includes auto-sensing remote control cir- cuit.

9.WELD TERMINALS CONTROL SWITCH- In the WELD TERMINALS ON position, the output is electrically hot all the time. In the REMOTELY CONTROLLED posi- tion, the output is controlled by a wire feeder or amptrol device, and is electrically off until a remote switch is depressed.

10. WIRE FEEDER VOLTMETER SWITCH:

Matches the polarity of the wire feeder voltmeter to the polarity of the electrode.

11. VRD (Voltage Reduction Device) INDICA- TOR LIGHTS- On the front panel of the Vantage 400 are two indicator lights. A red light when lit indi- cates OCV(Open Circuit Voltage) is equal to or greater than 30V and a green light when lit indicates OCV(Open Circuit Voltage) is less than 30V.

The VRD “On/Off” switch inside the control panel must be “On” for the VRD function to be active and the lights to be enabled. When the machine is first started with VRD enabled, both lights will illuminate for 5 seconds.

These lights monitor the OCV(Open Circuit Voltage) and weld voltage at all times. In the CC-Stick mode when not welding the green light will illuminate indi- cating that the VRD has reduced the OCV to less than 30V. During welding the red light will illuminate when- ever the arc voltage is equal to or greater than 30V. This means that the red and green light may alternate depending on the weld voltage. This is normal opera- tion.

If the red light remains illuminated when not welding in the CC-stick mode, the VRD is not functioning properly. Please refer to your local field service shop for service.

If the VRD is turned “On” and the lights don’t come “On”, refer to the trouble shooting section.

TABLE B.1

VRD INDICATOR LIGHTS

MODE			VRD "ON"	VRD "OFF"
CC-STICK		OCV	Green (OCV Reduced)
		While	Red or Green
		Welding	(Depends on Weld Voltage) *
CV-WIRE		OCV	Red (OCV Not Reduced)
			Weld Terminals On
			Red (OCV Not Reduced)
			Weld Terminals Remotely Controlled
			Gun Trigger Closed
			Green (No OCV)
			Weld Terminals Remotely Controlled
			Gun Trigger Open	No Lights
		While	Red or Green
		Welding	(Depends on Weld Voltage) *
PIPE		OCV	Green (No Output)
		While	Not Applicable (No Output)
		Welding
ARC GOUGING	OCV		Green (No Output)
		While	Not Applicable (No Output)
		Welding
TIG		OCV	Green (Process is Low Voltage)
		While	Green (Process is Low Voltage)
		Welding

*It is normal for the lights to alternate between colors while welding.

VANTAGE® 400