Lincoln Electric DC-400 ARC FORCE CONTROL Dial Effective only in CC mode, Output Terminals Switch

b-6 OPERATION b-6

In this position, the dynamic characteristics of the machine under welding conditions provide optimum welding characteristics for Innershield® welding, other open arc processes including short arc MIG welding, and air carbon arc. Most submerged arc welding can also be done in this mode.

The CV (Submerged Arc) Mode also produces an essentially flat output characteristic that can be varied from approximately 12 to 42 volts. The dynamic characteristics of the CV Submerged Arc Mode make possible improved submerged arc welding over that possible using the Constant Voltage Innershield Mode. The improvement is most noticeable on high deposition, slow travel speed welds.

There are no means provided to switch between any of the modes remotely. Do not change the position of the MODE SWITCH if output voltage or current is pre- sent as this may damage the switch.

The CC Mode permits the DC-400 to produce a con- stant current output characteristic through the range of 60-500 amps with an open circuit voltage of approxi- mately 57 volts (54V on 50/60 Hz). Stick welding and TIG are done with this position of the Mode Switch.

ARC FORCE CONTROL DIAL (Effective only in CC mode)

The ARC FORCE control is calibrated from one to ten. For most welding, the dial should be set at approxi- mately midrange, 5-6. Adjustments up or down can then be made depending on the electrode, proce- dures, and operator preference. Lower settings will provide less short circuit current and a softer arc. A setting that is too low may cause the electrode to stick in the puddle. Higher settings will provide a higher short circuit current and a more forceful arc. Excessive spatter may result if the control setting is too high. For most TIG welding applications adjust this control to a minimum for best operating character- istics.

ARC CONTROL SWITCH (Effective only in CV FCAW/GMAW mode)

The ARC CONTROL is a tapped switch numbered from 1 to 5 and changes the pinch effect of the arc. This control is most useful in processes that utilize a “shorting” metal transfer and controls the spatter, fluid- ity, and bead shape. The pinch effect is increased by turning the control clockwise.

For all applications, a good starting point for the ARC CONTROL is a midrange dial setting of 3. The control can be increased or decreased as desired.

OUTPUT TERMINALS SWITCH

The OUTPUT TERMINALS toggle switch on the con- trol panel labeled “REMOTE - ON” allows the welder output to be activated remotely or to be always on. For remote operation, the toggle switch is set in “REMOTE” position and the welder output will be acti- vated when 2 and 4 are closed when using a wire- feeder. For welder output to always be activated, set the switch to the “ON” position.

110-115V AC and 40-42V AC Auxiliary Power and Control Connections

14-PIN CONNECTOR

The 14-pin connector receptacle supplies auxiliary power.

40-42V AC is available at receptacle pins I and K. A 10 amp circuit breaker protects this circuit.

On the Domestic and Export models 110-115V AC is available at receptacle pins A and J. A 10 amp circuit breaker protects this circuit. Note that the 40-42V AC and 110-115V AC circuits are electrically isolated from each other.

FRONT VIEW OF 14-PIN

CONNECTOR RECEPTACLE

	K=42
A=32	J=31
B=GND	I=41
L=SPARE	N=SPARE

C=2		H=21
D=4		G=75
	E=77	F=76
		M =SPARE

PIN	LEAD NO.	FUNCTION
A	32	110 - 115V AC (Domestic & Export)
B	GND	CHASSIS CONNECTION
C	2	TRIGGER CIRCUIT
D	4	TRIGGER CIRCUIT
E	77	OUTPUT CONTROL
F	76	OUTPUT CONTROL
G	75	OUTPUT CONTROL
H	21	WORK CONNECTION
I	41	40-42V AC
J	31	110-115V AC (Domestic & Export)
K	42	40-42V AC
L	---	---
M	---	---
N	---	---

IDEALARC® DC-400