Theory of operation, General description, Engine – Lincoln Electric CLASSICII SVM125-A User Manual

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GENERAL DESCRIPTION

The Classic II is a heavy duty, engine driven DC arc
welding power source capable of providing constant
current output for stick welding or DC TIG welding.
Also, a total of 3000 watts of auxiliary power is avail-
able at the 115 or 230VAC receptacles. The Classic II
is manufactured with all copper windings.

BATTERY, STARTER, ENGINE,
ALTERNATOR, AND PROTECTION
CIRCUITS

The 12VDC battery powers the starter motor and,
through the ignition switch, the engine protection cir-
cuitry. In the event of a low oil pressure or a high oil
temperature condition, the engine protection system
shuts the engine off. The protection relay monitors the
oil pressure sensor and the oil temperature sensor. If
either sensor “ faults,” the protection relay deactivates
the fuel solenoid and the engine shuts down.

The engine alternator supplies “charging” current for
the battery circuit. If the alternator would cease to func-
tion correctly, due to a broken fan belt or other mal-
function, the CR1 relay would activate, causing the pro-
tection relay to close the fuel solenoid and shut off the
engine.

THEORY OF OPERATION

E-2

CLASSIC II