Generac Power Systems NP-40G - Manual (Page 15)

Section 1.3- OPERATIONAL ANALYSIS
General
Figure 1, below, is a block diagram of the com­
puter controlled RV generator. The diagram la In­
tended only for the purpose of Illustrating genera­
tor operation. Refer to the actual wiring diagram for
wiring interconnections.
Operational Description
1. The PERMANENT MAGNET ROTOR Is directly
coupled to the ENGINE and rotates at the same
speed as the engine.
2. As the ROTOR turns, its magnetic field cuts
across a number of STATOR windings, to Induce a
voltage Into those windings. A voltage Is induced
Into the following STATOR windings:
a. Phase 1 and 2 of the STATOR POWER WIND­
INGS (output leads AC1-AC2 and SL1-SL2).
b. The STATOR POWER SUPPLY WINDING with
output leads PS1-PS2.
c.
The STATOR TIMING WINDING (output leads
TIM1-TIM2).
d.
STATOR BATTERY CHARGE WINDING with
output leads 55,66 and 77.
3. STATOR BATTERY CHARGE WINDING o^ut Is
delivered to the unit battery via a BATTERY
CHARGE RECTIFIER (BCR) and a 1 OHM, 50 WATT
RESISTOR. The circuit Is completed through the
battery to frame ground and back to the BATTERY
CHARGE WINDING via Wire 55.
4. STATOR TIMING WINDING output is delivered to
the CCG CIRCUIT BOARD. The circuit board mea­
sures the frequency of the waveform and calcu­
lates a "frequency divisor" to maintain a useable
frequency to the CUSTOMER CONNECTION re­
gardless of rpm.
5. The STATOR POWER SUPPLY WINDING output
Is delivered to the CCG CIRCUIT BOARD. This is
the power supply for operation of the circuit board
and GENISTOR.
6.
STATOR POWER WINDING OUTPUT (Phase 1
and 2) Is delivered to a GENISTOR. The GENISTOR
is a nIgh-speed switching device which is con­
trolled by the CCG board.
7. The CCG CIRCUIT BOARD senses voltage and
frequency and then acts to control voltage and
frequency as follows:
Figure 1. Block Diagram- AC Generator System
WIRE18B
.(ENGINE
SHUTDOWN)
STATOR
POWER
WINDING
AC1-AC2
WА‘§К2
STATOR
POWER
WINDING
SL1-SL2
STATOR
POWER
SUPPLY
WINDING
PS1-PS2
STATOR
TIMING
WINDING
TIM1-TIM2
STATOR
BATTERY
CHARGE
WINDING
66-77
MAGNETIC
FIELD PERMANENT
MAGNET
ROTOR
ENGINE
Page 1.3-1