Lincoln Electric SVM175-A Theory of Operation, Battery, Engine, Engine Protection, Chopper

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

E-2	THEORY OF OPERATION	E-2
	FIGURE E.2 – BATTERY, ENGINE, ENGINE PROTECTION, CHARGING, IDLE CONTROL

			SHUNT	+
POWER	IGBTs	CHOKE		-
MODULE

ENGINE			CHARGING
PROTECTION
LIGHT			SYSTEM LIGHT
			(CODE 10926 ONLY)
ENGINE	ENGINE	GLOW	ENGINE
PROTECTION				WELD
CIRCUIT	SENSORS	PLUGS	ALTERNATOR
				WINDING

PUMP

ROTOR

FUEL

ENGINE

FUEL

SOLENIOD

HOLD COIL

PULL COIL

STATOR

AMP

STARTER

START

EXCITER

120/240 VAC

42 VAC

WELD CONTROL

DISPLAY

BUTTON

IDLE

WINDING AUX.WINDING

WINDING

P.C. BOARD

VOLT

SOLENOID

CURRENT

DISPLAY

PULL

HOLD

240

SENSOR 14

COIL

COIL

VAC

120

PIN

6

GLOW

FLASHING

RECEPTACLES

vac

AMPHENALS

PIN

PLUG

12V.

BUTTON

PULL COIL

BATTERY

PC BOARD

IDLE

RUN

OUTPUT

MODE

WELDING

SWITCH

STOP

SWITCH

CONTROL

SWITCH

TERMINAL

GENERAL DESCRIPTION

Starting the engine:

ARC

SWITCH

CONTROL

The Ranger 305D is a diesel engine-driven welding

Starting the engine first requires that the Run/Stop

power source capable of producing 300 amps at

switch be in the run position. The glow plug button is

29VDC at a 100% duty cycle. The engine is coupled to

then pressed and held; this preheats the engine to

a brush-type alternating current generator.

This AC

enhance starting and also temporarily provides power

output is rectified then controlled by

Chopper

to the fuel pump (codes 10926 and 11121), and fuel

Technology to produce DC current for multi-purpose

solenoid hold coil.

welding applications. The Ranger 305D is also capa-

The start button is pressed while still holding the glow

ble of producing 9,500 watts (10,000 watts peak) of AC

plug button.

The start button cranks the engine and

auxiliary power at 100% duty cycle.

powers the fuel solenoid pull cord.

Battery, Engine, Engine Protection,

The engine starts, builds oil pressure, and spins the

and Charging System.

The charging system indicator light (code 10926), and

BATTERY:

engine alternator, which begins charging the battery.

engine protection light turns off, the fuel pump (codes

The 12VDC battery powers the engine starter motor,

the engine protection indicator will turn off. When the

10926 and 11121), and fuel solenoid are receiving

glow plug circuit, engine protection circuit, fuel pump

power from the engine protection circuit. The operator

(codes 10926 and 11121), and fuel solenoid. Power is

can now release the glow plug button.

also supplied to other components.

The engine protection system now monitors the oil

pressure and coolant temperature sensors. If either

sensor detects a fault condition, the engine protection

indicator will light, and power will be interrupted to the

fuel

solenoid, immediately

shutting the

engine off.

NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

RANGER 305D