Controls And Outlets - Thermal Arc EXCEL-ARC 750 CC Owner's Manual

Controls and Outlets

See callouts on Figure 3-1.
1. Pilot Light (500016-1, -2, -3 & 500016A-1, -2,
-3) — When lighted, indicates that the input contac-
tor (power) is ON.
2. Input Contactor Control (500016-1, -2, -3 &
500016A-1, -2, -3) — This toggle switch is the
master power switch for the welding machine, and
must be in the ON position before any other section
will operate. The primary circuit of the control trans-
former is energized whenever line voltage is present
at the input terminals. This switch closes the secon-
dary circuit of the control transformer, energizing the
contactor, which energizes the power transformer.
Do not use this switch to start or stop arc. Start arc
with switch ON, break arc, then turn switch OFF.
3. Local/Remote Output Control Volts/Amps
Selector Switch (500016-1, -2, -3 & 500016A-1, -2,
-3) — Selects either the output control (Local) or
some remote control device (Remote) to control
welding output.
4. 115-V AC Receptacles (500016-1, -2, -3 &
500016A-1, -2, -3) — Provides auxiliary power for
lights, wire feeders, water pumps, etc. — 15 amps
maximum.
December 1, 1997 Revised
5. CC/CV Selector Switch (CC/CV) (500016-3 &
500016A-3) — Selects the welding mode of opera-
tion.
6. Feeder Control Receptacle Panel (Automat-
ic) (CV units) (500016-2, -3 & 500016A-2, -3) —
Amphenol (19-pin) connector for a remote voltage
control type wire feeder. (Semiautomatic) (5-pin)
connector for the control cable from semiautomatic
wire feeder only.
7. Arc Force Control (CC/CV Units) (500016-1,
-3 & 500016A-1, -3) — This potentiometer controls
short circuit (welding) current to produce an in-
crease in current as the arc length is shortened. The
control is present to provide the degree of "hard
start" required, and the additional dynamic change
for welding tight grooves, etc. Turn clockwise to
increase "hard start" characteristics, counterclock-
wise to obtain a soft-start, smooth arc.
8. Welding Voltage/Amperes Control (CV
Units) (500016-2, -3 & 500016A-2, -3) — Adjusts
arc welding output and open circuit voltage. Open-
circuit voltage is approximately 1.5 times the weld-
ing voltage for constant voltage welding.
500016-1, -3 & 500016A-1, -3 (CC units) — Adjusts
the welding current.
Figure 3-2 EXCEL-ARC
Dimensions and Weight
DESCRIPTION OF EQUIPMENT
NOTE: Only one feeder control receptacle
is used at any one time.
®
8065
430429-174
On
3-3