Generac Power Systems XT-EFI Series Manual page 12

Section 2 Direct Excitation (Brush Type)
via Wire 4, and the positive brush and slip ring. This
excitation current flows through the rotor windings and
through the negative (-) slip ring and brush on Wire 0.
The greater the current flow through the rotor windings,
the more concentrated the lines of flux around the rotor
become. The more concentrated the lines of flux around
the rotor that cut across the stationary stator windings,
the greater the voltage that is induced into the stator
windings.
Some generators have color coded wires. Always use
the appropriate schematic and wiring diagram for unit.
Initially, the AC power winding voltage sensed by the
regulator is low. The regulator reacts by increasing the
flow of excitation current to the rotor until voltage
increases to a desired level. The regulator then maintains
the desired voltage. For example, if voltage exceeds the
desired level, the regulator will decrease the flow of
excitation current. Conversely, if voltage drops below the
desired level, the regulator responds by increasing the
flow of excitation current.
AC Power Winding Output
A regulated voltage is induced into the stator AC power
windings. When electrical loads are connected across
the AC power windings to complete the circuit, current
can flow in the circuit.
0 (-) WHITE
VOLTAGE REGULATOR
6
C1 FEMALE
4 (+) RED
Figure 2-3. Alternator Configuration B
TO LOAD
MLB = MAIN LINE
MLB
CIRCUIT BREAKER
240 VAC
120 VAC
STATOR
POWER
WINDING
MAGNETIC
FIELD
ENGINE -
DIRECT ROTOR
DRIVE
MAGNETIC
FIELD
STATOR
EXCITATION
WINDING
Figure 2-2. Generator Operating Diagram
S15
WHITE
AVR SENSING
GREEN S16
NOT USED
C1 MALE
RED (R2 – 22)
BLUE (R1 – 11)
BROWN (L2 – 44)
WHITE (L1 – 33)
WHITE
TERMINAL BLOCK
120 VAC
SENSING
STATOR
POWER
WINDING
- +
AUTOMATIC
VOLTAGE
REGULATOR
2
BLUE
DPE
6 BLUE
POWER WINDING
BROWN
RED
BLUE
L1 L2 R1 R2
44 22
(BLACK) (WHITE)
33 11
(WHITE) (RED)
004966
TO PANEL
Diagnostic Repair Manual