OPERATION |
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3.OUTPUT CONTROL 
This control provides continuous control of the machine’s output voltage and current from minimum to maximum (typical full pot range between 15 to 44 volts and 90 to 750 amps) as it is rotated
4.OUTPUT TERMINALS ON/REMOTE Switch
When this switch is in the REMOTE “ 
” posi- tion, the
the ON “ 
” position the machine’s output termi- nals will be electrically energized all the time.
5.LOCAL/REMOTE Switch
When this switch is set to the LOCAL “
“ position, control of the output voltage and current is via the OUTPUT CONTROL on the
When this switch is set to the REMOTE “ 
” position, control is through a remote source such as a wire feeder via the #75, #76, and #77 leads in the
6.Mode Switch
This switch allows for selecting the welding process to be used:
CC
CV SUBMERGED ARC- for SAW
CV INNERSHIELD- for FCAW and GMAW
7.115VAC Duplex Receptacle (60 Hertz Models) This receptacle provides up to 15 amps of 115 VAC auxiliary power.
8.115VAC 15 Amp Circuit Breaker 
This breaker protects the 115 VAC auxiliary circuits located in the duplex receptacle, terminal strip (T.S.2) and
9.42VAC 10 Amp Circuit Breaker 
This breaker protects the 42VAC auxiliary circuits located in the terminal strip (T.S.2) and
10.14 Pin MS-Receptacle
This connector provides easy connection for a wire feeder control cable. It provides connections for auxiliary power, output switching, remote output control, wire feeder voltmeter sense lead and ground. Refer to 14 Pin MS Type Receptacle in the Installation Section for information about the circuits made available at this receptacle.
11.Terminal Strip Cover Panel
Rotate this panel to gain access to the circuits made available at the two terminal strips (T.S.1 and T.S.2). These terminal strips contains the same circuits as the 14 pin
12.Negative Output Terminal
This output terminal is for connecting a welding cable. To change welding polarity and for proper welding cable size refer to Electrode and Work Cables in the Installation Section.
13.Positive Output Terminal
This output terminal is for connecting a welding cable. To change welding polarity and for proper welding cable size refer to Electrode and Work Cables in the Installation Section.
AUXILIARY POWER IN MS-RECEPTACLE
42 volt AC auxiliary power, as required for some wire feeders, is available through the wire feeder
OVERLOAD, OVERCURRENT, AND FAULT PROTECTION
This welder has thermostatic protection from excessive duty cycles, overloads, loss of cooling, and high ambi- ent temperatures. When the welder is subjected to an overload or loss of cooling, a thermostat will open. The input contactor will open and remain open until the machine cools; the white POWER light stays illuminat- ed. No welding is possible during this cool down peri- od. The machine will reset automatically when the ther- mostat cools.
The power source is also protected against overcur- rents in the SCR bridge assembly through an electron- ic protection circuit. This circuit senses currents over 780 amps on the power source and opens the input contactor should the overcurrent remain for a predeter- mined time (the white POWER light stays illuminated). The predetermined time varies with the amount of overcurrent; the greater the overcurrent, the shorter the time. The input contactor will remain open until the power source is manually started by resetting the POWER ON/OFF toggle switch.