OM 2012
C. ii&art Ensine Equlpmzn!
(1) Electric governor sy:tirn
An e lec:r;
c yo*cerrtor kit is instolltid on the engine
to rcp!ace a CcnWii~icnCJI,
rnzchirnicai typz. The electric governor was se/ectcd for con;-rol of ensir;
speed (and generator output freqczncy) because it provides faster engill?
respdze
to changes in load conditio!r, .
This fast rcsponcc resufts in very
close frequ0icy control.
Refer to the American Bozch t-ian&rmk in Chapter 6
for a detailed description. A brief description is given below:
The governor system consists of th
e fol lowing ri;u in components :
Magnetic pickup
Control unit
Actuator
(a) Magnetic pit kup
The magnetic pickup (17, Fig. 3j is a device for detecting the spzcd of
* the engine. It is mounted in the flywheel housing directly over the ring
gear. It produces an AC signal to the control unit when the ferret-s fly- ,
wheel teeth pass through the rnagnztic field at the end of the pickup.
(b) Control unit
The control unit (9, Fig. 3) is a box containing a compact assembly of
solid state components.
It receives an AC signal from the magnetic pick-
up and senses speed changes in the engine.
It provides o voltage signal
to the actuator which causes the actuat,or to move the fuel control lever
as required to maintain a predetermined engine speed. Ifs power is re-
ce ived from the 12-V DC battery system.
(c) Actuator
The actuator (20, Fig. 3) supplies the force needed to move and position
the fuel lever as required to maintain a corstant engine speed. The actuator
is operated by a DC signal from the control unit.
(2) Engine safety devices
l-l
Page 10
Aug 25’85
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