Generac Power Systems NP-40G - Manual (Page 14)

Section 1.2- MAJOR GENERATOR COMPONENTS
The CCG
VOLTAGE CONTROL:
The CCG circuit board utilizes a closed-loop,
proportional-derivative controller which regulates
RMS voltage by changing engine speed. The sys­
tem maintains output voltage at about 115 volts at
the lowest rpm and 120 volts up to the maximum
rpm.
The board controls a Stepper Motor (Figure 5),
which moves the throttle. The board calculates the
number of steps the Motor needs to take and sig­
nals the Motor to move. Motor movement changes
throttle position and changes In engine speed re­
sult.
FAULT PROTECTION:
Circuit Board (Continued)
CIRCUIT BOARD CONI CONNECTIONS:
The board Is equipped with eight (8) connection
points (receptacles). These are identified as
"CONNr through "CONNS". See Figure 9.
The CCG board has the ability to detect several
fault conditions and shut the engine down, as fol­
lows:
1. Overvoltage:- If the output voltage exceeds 127
VAC for longer than 15 seconds, the board will turn
AC output power off and shut the engine down.
2. Undervoitage:- If output remains below about 96
VAC longer than 15 seconds, an overload condition
probably exists. The board will then turn AC output
off and shut the engine down.
3. Overspeed:- if engine speed exceeds 4500 rpm,
shutdown will occur.
4. Failure of the Genistor (frequency converter) will
result in engine shutdown.
5. Loss of output to any circuit connected to the
board will result in engine shutdown.
CONNECTOR FUNCTION
CONNI Six-pin connector Interconnects
with speed control Stepper Motor.
CONN2 12-pin connector is NOT used on
RV units. An orange jumper wire
is connected across Pins 5 & 11.
CONN3 7-pin connector interconnects with
the Genistor.
CONN4 4-pln receptacle for connection of
the Stator power supply leads
(PS1, PS2) and the Stator timing
leads (TIM1, TIM2).
CONNS Single point connection for Stator
lead No. 11 (blue).
CONN6 Interconnects with the Genistor.
CONN7 Single point connector Is NOT
used on RV units.
CONNS Single point connector for Wire 18B.
Interconnects with Engine Cont­
roller circuit board, allows the
CCG board to shut the engine down.
Figure 9. the CÔà Circuit Board
-Ó
0 0 ^
C0NN4
CDNN8 CDNN7 CDNN5
a
u
JSl_______________
CGNN3 CDNN6
lij Itl lil Ui lli'ururuu umuuiuiuniniimui Ui'Ul uul
Ì i
□
o
m f a m f s i f s i f i i f g i f a i f g i m f i i m f s i m m i s i f C T m i j u n j
-O ■~L0r'
o
Page 1.2-4