GMC T Series 1994 Repair Manual page 603

N O T IC E : W h e n f a s t e n e r s a r e r e m o v e d , a lw a y s r e in s t a ll th e m a t th e s a m e lo c a t io n f r o m w h ic h t h e y w e r e
r e m o v e d . I f a f a s t e n e r n e e d s to b e r e p la c e d , u s e th e c o r r e c t p a r t n u m b e r f a s t e n e r f o r t h a t a p p lic a tio n . I f
t h e c o r r e c t p a r t n u m b e r f a s t e n e r is n o t a v a ila b le , a f a s t e n e r o f e q u a l s iz e a n d s t r e n g t h ( o r s t r o n g e r ) m a y
b e u s e d . F a s t e n e r s t h a t a r e n o t r e u s e d , a n d t h o s e r e q u ir in g t h r e a d lo c k in g c o m p o u n d w ill b e c a lle d o u t.
T h e c o r r e c t t o r q u e v a lu e m u s t b e u s e d w h e n in s t a llin g fa s te n e r s t h a t r e q u ir e it. I f t h e a b o v e c o n d it io n s
a r e n o t fo llo w e d , p a r t s o r s y s t e m d a m a g e c o u ld r e s u lt.
SUBJECT
General D escription....................................................................................................................................................6D3A- 1
Delco Remy CS-144 Generator........................................................................................................................... 6D3A- 1
Operating Principles...........................................................................................................................................6D3A- 1
Diagnosis....................................................................................................................................................................... 6D3A- 2
Generator Output T e s t...........................................................................................................................................6D3A- 2
D isassem bly.................................................................................................................................................................. 6D3A- 3
Drive End Fram e......................................................................................................................................................6D3A- 3
Slip Ring End Fram e.............................................................................................................................................. 6D3A- 3
Inspection and R e p air............................................................................................................................................... 6D3A- 6
Cleaning and Inspection........................................................................................................................................6D3A- 6
Electrical Tests......................................................................................................................................................... 6D3A- 7
Rotor Field Winding C h e c k s ........................................................................................................................... 6D3A- 7
Stator C hecks....................................................................................................................................................... 6D3A- 7
Rectifier Bridge C h e c k ...................................................................................................................................... 6D3A- 7
R egulator................................................................................................................................................................6D3A- 7
A ssem bly....................................................................................................................................................................... 6D3A- 8
Slip Ring End Fram e.............................................................................................................................................. 6D3A- 8
Drive End Fram e......................................................................................................................................................6D3A- 9
Main Assem bly......................................................................................................................................................... 6D3A- 9
S p ecificatio n s...............................................................................................................................................................6D3A-10
Generator Specifications...................................................................................................................................... 6D3A-10
Fastener Tightening Specifications....................................................................................................................6D3A-10
Special T o o ls ................................................................................................................................................................6D3A-10
DELCO REMY C S-144
GENERATOR
The CS-144 generator with integral regulator shown
in figure 1 features a high ampere output per pound of
weight. It does not use a diode trio. The delta stator,
rectifier bridge, and rotor with slip rings and brushes,
are electrically similar to other CS-series generators.
CS stands for Charging System, and 144 indicates the
outside diameter of the stator laminations in millimeters.
The bearings are sealed with lifetime lubrication in both
end frames. No periodic maintenance is required.
OPERATING PRINCIPLES
Regulator voltage setting varies with temperature and
limits system voltage by controlling rotor field current.
When the field current is ON, the regulator actually
SECTION 6D3A
CS-144 GENERATORS
CONTENTS
GENERAL DESCRIPTION
switches rotor field current on and off at a fixed fre­
quency of about 400 cycles per second to help control
radio noise. By varying on-off time, correct average field
current for proper system voltage control is obtained. At
high speeds, on-time may be 10 percent and off-time
90 percent. At low speeds, with high electrical loads,
on-off time may be 90 percent and 10 percent respec­
tively.
A basic wiring circuit for the " PLIS" regulator is
shown in figure 2. The " P" terminal connects to the
stator. The " S" terminal may be connected externally to
the battery to monitor voltage and make sure the regu­
lator maintains an adequate voltage level to charge the
battery. If the " S" terminal is not connected externally,
integrated circuits in the regulator are used for sensing
voltage.
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