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(299)
ELECTRICAL SYSTEMS
GENERATING SYSTEM
10-23
1949
44
42
40
38
36
34
32
30
28
If)
26
w
a:
w
n.
24
::;:
<t
I
I--
22
=>
o,
I--
=>
0
20
a:
0
I--
<t
18
a:
w
z
w
16
'"
14
1
2
10
8
6
4
2
HbT
OUTPUT CURRENT REGULATOR
OPERA TING
AT
IDEAL SETTING
HOT
OUTPUT AT
25
M.P.H
.
L
OW BA
TTERY
50 SERIES
4.1
AXLE
RATIO
(
OPT.)
A
VERAGE
HOT
OUTPU T
VOL
TAGE REGULA TOR
NO
T
OPERATING
50
SERIES 4.1 AXLE
RATIO
(OPT )
50
SERIES 4.4 AXLE
RA
TIO
(STU)
DYNAFLOW CURVE
NOT
SHOWN
DUE
TO
VARYING RATIO
HOT OUTPUT FULLY CHARG ED BATTERY
VOLTAGE REGULATOR OPERATING AT
7.4
VOL TS
96
88
80
72
a:
=>
0
6
4
I
a:
w
56
n,
If)
w
-'
48
::E
40
32
24
1
6
.
8
o
400
eoo
1200 1600
2000 2400 2000 3200 3600 4000 4400 4800
5200 5600 6000 6400
seoo
7200 7600
eooo
GENERATOR
R.
P.
M.
Figure 10-12-Generator Output Chart-1949 Series
50-70
a. Cutout Relay
The cutout relay opens the circuit to pre-
vent the battery from discharging to ground
through th
e
gen
erator
whenever the engine is
stopped
or generator
is operat ing at such low
speed that its
voltage is
less
than
voltage
of
battery.
When the voltage of generator is
slightly greater than battery voltage the relay
closes the circuit so that generator can furnish
current to the electrical system.
The cutout relay has a series or current
winding of a few turns of heavy wire, and a
shunt or voltage winding of many turns of fine
wire,
both assembled on the same core. The
shunt winding is connected between generator
armature and ground so that generator voltage
is
impress ed
upon it at all times. The series
winding is
connecte d so that all generator out-
put cur r ent must pass through
it.
It
is con-
nected to a flat steel armature which has a pair
of contact points through which current passes
to the battery and other electrical
units.
The
contact points are held open by armature spring
tension when the unit is not operating. See fig-
ure
10-15 or
10-16.
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