Operation; General; Preweld Operation; Smaw (Stick) Welding, Carbon Arc Gouging - Thermal Arc EXCEL-ARC 750 CC Owner's Manual

OPERATION

General

Before operating this system, be sure that all in-
stallation instructions have been accomplished.
When operating this system, observe all applicable
Safety Warnings listed in this and related system
manuals.
The operating instructions in this manual pertain
only to the EXCEL-ARC
Consult operating instructions for components used
with this system before operating.
A thermostatically controlled fan motor is standard
on this unit. The fan motor starts and stops automat-
ically when a predetermined temperature has been
reached.

Preweld Operation

1. Connect welding leads to terminals on front
panel.
WARNING: Disconnect line volt-
age from the unit before making
any connections inside unit.
T urn off f use d disconnect
switch that supplies power to
welding machine, and remove
its fuse.
ELECTRIC SHOCK can kill!
• Do not touch live electrical
parts, including the output
terminals and electrode.
2. If used, connect remote control wire assembly
and gun switch to welding machine. Connect feeder
receptacle to wire electrode feeder system.
3. Refer to other manuals for component connec-
tions.
4. Set Output Control to desired value.
5. Set the remote/local control switch in the desired
mode.
6. Set the stick/Tig switch (500016-3 & 500016A-
3) in the desired mode.
December 1, 1997 Revised
®
8065 welding machines.
7. Place the voltage sensing jumpers (500016-2
and -3 & 500016A-2 and -3) on the main P.C. control
board to the desired mode. Local (voltage sensing
from the power source which comes from the fac-
tory), Jumper JP-2 (–) and JP-4 (+). For remote
voltage sensing, going out to the optional terminal
strip – Thermal Arc P/N 204248
and JP-5 (+ ).
SMAW (Stick) Welding, Carbon
Arc Gouging
(500016-3 & 500016A-3)
Refer to Figure 3-1 for controls (numbers in paren-
thesis refer to callouts on Figure 3-1).
1. On 500016-3 & 500016A-3 set the CC/CV
selector switch to CC position.
2. Hold electrode clear of work, and set Stick/Tig
Switch (15) to STICK position. Be sure the Remote-
Local Switch (3) is set to LOCAL position.
3. Turn Input Contactor Control Switch (2) to ON
position.
4. Strike arc. Adjust Welding Output Control (8) if
required. Adjust Arc Force Control (7) to desired
level.
5. At the conclusion of welding, break arc, and turn
Input Contactor Control Switch (2) to OFF position.
Welding, Semiautomatic or
Automatic
Refer to Figure 3-1 for controls.
1. On 500016-2 and -3 & 500016A-2 and -3 set
Remote/Local Output Control Switch (3) and Volt-
age Sensing Jumpers to LOCAL — JP-2 and JP-4.
NOTE: Set Output Control Switch (3) to
REMOTE when using a feeder which con-
trols the voltage, and remote voltage con-
trol is desired. Set Voltage Sensing
Jumpers to JP-3 and JP-5 to REMOTE
when using a feeder which provides volt-
age sensing at the actual welding location.
If the Voltage Sensing Jumpers are placed
in the REMOTE position, and the voltage
sensing leads are not connected at the
welding location, the output of the welding
machine will go to maximum amperage.
430429-174
OPERATION
Jumper JP-3 (–)
5-1