Operational description (continued) – Generac Power Systems NP-40G User Manual
Page 16
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Section 1.3- OPERATIONAL ANALYSIS
Operational Description (Continued)
a. The circuit board senses actual voltage and b. The CCG board <
"compares“ it to a pre-set “reference“ voltage of
about 115-120 volts AC.
0) If voltage Is low, the board will signal a STEPPER
MOTOR to change engine throttle setting and In
crease speed until the desired voltage level Is
reached.
If voltage goes high, the board will signal the
STEPPER MOTOR to reduce engine throttle setting
until the desired voltage level Is obtained.
(3) Engine speed Is variable and Is used to control
output voltage and may range from about 2520 to
4050 rpm.
controls AC frequency by
acting on the GENISTOR.
(1) The GENISTOR is a high speed switching
device.
(2) The CCG board signals the Genistor to switch
generator waveforms on and off at the proper
times. In order to maintain a frequency In the
55-65 Hertz band.
8.
The CCG circuit board can protect the system
against some faults by shutting the engine down,
wire 18B is the “engine shutdown“ lead that con-
nectcts this system to the Engine Controller circuit
board. See “FAULT PROTECTION“, Page 1.2-4.
Page 1.3-2