Lincoln Electric RANGER 305 D Service Manual page 51

RANGER 305D
FIGURE E.2 – B TTERY, ENGINE, ENGINE PROTECTION, CH RGING, IDLE CONTROL
ENGINE
PROTECTION
LIGHT
ENGINE
PROTECTION
CIRCUIT
FUEL
PUMP
FUEL
SOLENIOD
HOLD COIL
PULL COIL
START
BUTTON
GLOW
PLUG
BUTTON
12V.
BATTERY
RUN
STOP
SWITCH
GENER L DESCRIPTION
The Ranger 305D is a diesel engine-driven welding power source
capable of producing 300 amps at 29VDC at a 100% duty cycle. The
engine is coupled to a brush-type alternating current generator. This
AC output is rectified then controlled by Chopper Technology to
produce DC current for multi-purpose welding applications. The
Ranger 305D is also capable of producing 9,500 watts (10,000 watts
peak) of AC auxiliary power at 100% duty cycle.
B TTERY, ENGINE, ENGINE PROTECTION, ND
CH RGING SYSTEM.
BATTERY:
The 12VDC battery powers the engine starter motor, glow plug circuit,
engine protection circuit, fuel pump (codes 10926 and 11121), and
fuel solenoid. Power is also supplied to other components.
CHARGING
SYSTEM LIGHT
(CODE 10926 ONLY)
ENGINE
GLOW
ENGINE
SENSORS
PLUGS
ALTERNATOR
ENGINE
STARTER
IDLE
SOLENOID
PULL
HOLD
COIL COIL
PULL COIL
PC BOARD
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
WELD
WINDING
ROTOR
STATOR
EXCIT ER 120/240 VAC 42 VAC
WINDING
WINDING AUX.WINDING
CURRENT
SENSOR
14
240
PIN
VAC 120
AMPHENALS
6
vac
RECEPTACLES
FLASHING PIN
ST RTING THE ENGINE:
Starting the engine first requires that the Run/Stop switch be in the
run position. The glow plug button is then pressed and held; this
preheats the engine to enhance starting and also temporarily provides
power to the fuel pump (codes 10926 and 11121), and fuel solenoid
hold coil.
The start button is pressed while still holding the glow plug button.
The start button cranks the engine and powers the fuel solenoid pull
cord.
The engine starts, builds oil pressure, and spins the engine alternator,
which begins charging the battery. The charging system indicator
light (code 10926), and the engine protection indicator will turn off.
When the engine protection light turns off, the fuel pump (codes
10926 and 11121), and fuel solenoid are receiving power from the
engine protection circuit. The operator can now release the glow plug
button.
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.
E 2
THEORY OF OPERATION
SHUNT
IGBTs
POWER
CHOKE
MODULE
AMP
DISPLAY
WELD CONTROL
VOLT
P.C. BOARD
DISPLAY
IDLE
SWITCH
OUTPUT
MODE
WELDING
CONTROL
SWITCH TERMINAL
SWITCH
ARC
CONTROL
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