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THEORY OF OPERATION
E-9 E-9
SAE-400 SEVERE DUTY
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WELDING GENERATOR OPERA-
TION (Continued)
Interpole coils:
Armature current from the remaining two sets of brush-
es is routed through four interpole coils, before being
connected to the weld output terminal. These coils are
narrower than the shunt and series coils, and are locat-
ed in the generator stator between them. Their purpose
is to reduce distortion of the magnetic field.
The magnetic field generated by the the shunt coils will
become distorted when current is drawn from the
armature. This distortion will increase as the current
flow increases. The interpole coils are connected and
arranged to counteract this magnetic distortion. If not
corrected, the distortion would cause reduced output
and excessive sparking on the commutator.
FIGURE E.2 - GENERAL DESCRIPTION
DIESEL
ENGINE
THERMOSTAT
INJECTION
PUMP
SOLENOID
SYSTEM
THERMOSTART
BUTTON
IDLE SWITCH
IDLE
SOLENOID
IDLE / ENGINE
PROTECTION BOARD
TO IDLE / ENGINE
PROTECTION BOARD
RUN/STOP
SWITCH
S
T
A
R
T
E
R
TO IDLE/ENGINE
PROT. BOARD
OIL
PRESSURE
SWITCH
TEMP
SWITCH
STARTER
SOLENOID
AMMETER
START
BUTTON
ENGINE
FAULT
LIGHT
HOUR
METER
TO
FLASHING
RESISTOR
AND
DIODE
INTERPOLE COILS
GENERATOR
ARMATURE
SERIES COILS
SHUNT COILS
115 VAC
RECEPTACLES
230 VAC
RECEPTACLES
AUXILIARY
POWER
WINDINGS
EXCITER
WINDING
EXCITER
ROTOR
MIN
(OFF)
MAX
OUTPUT
CONTROL
ELECTRODE
TERMINAL
RESISTOR
POLARITY
SWITCH
REMOTE
RHEOSTAT
LOCAL
RHEOSTAT
(JOB SELECTOR)
TO HOUR METER
FLASHING
RESISTOR AND
DIODE
(+)
(+)
(-)
(-)
AC
AC
(-) (+)
WORK
TERMINAL
TO ALTERNATOR
FLASH/SENSE
TO INJECTION
PUMP SOLENOID
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion