the stop button (25-C) and depress
0.6 volt during the shock load test
the start button (25-A) (do not
in (c) above, turn the contact screw
d e p r e s s button more than 10 sec-
assembly (fig. 58) outward (loosen
onds). Turn the speed control han-
the locking screws first then tighten
dle (24) slowly until 4,000 rpm are
a g a i n after adjustment (fig. 58)).
indicated on the tachometer indica-
Note. The adjustment in (d) a b o v e
m u s t be made very gradually.
tor meter (3) and observe the volt-
(e) I f t h e v o l t a g e r e a d i n g o n t h e d c
a g e reading on the dc voltmeter
voltmeter (4) exceeds 28 volts turn
(4). Voltage reading should be 28.3
t h e contact screw assembly (fig.
plus or minus 0.3 volts.
(d) With the 100-50 fixed load switch
5 8 ) inward.
(17-A) in the "ON" position place
( f ) A f t e r each adjustment of the con-
the starter test load disconnect
tact screw assembly (fig. 58), read-
switch (15) in the "OFF" and
just the coil core (8, fig. 58) (loosen
" O N " positions several times and
screw (14, fig. 58) first before ad-
observe the voltage reading on the
j u s t m e n t and tighten again after
dc voltmeter (4). The voltage
The coil core is
adjustment).
reading should not rise above 28.3
screwed in or out to give an output
or drop below 27.3 under the 100-
o f 28.0 (plus or minus 0.2) volts
50 fixed load.
w i t h battery on-off switch (22) to
(e) I f voltage drops below 27.3 volts
" O N " position only. Repeat pro-
when full 100-50 fixed load is ap-
c e d u r e s i n (a) t h r o u g h (f) a b o v e
p l i e d , (d) above, turn the contact
until the generator (alternator)
s c r e w assembly (fig. 58) (loosen
regulator
controls
the voltage
t h e two locking screws first, and
w i t h i n the limits of 27.4 to 28.0
t i g h t e n them after adjustments are
volts while the load is shocked off
made (fig. 58)) counterclockwise
a n d on, (c) above, several times.
a n d repeat, (d) a b o v e . I f v o l t a g e
Continue with tests in (6) below.
exceeds 28.3 volts, turn the contact
(6) Testing voltage adjustment at 4,000
screw assembly (fig. 58) clockwise
rpm.
and repeat, (d) above. Repeat pro-
(a) Turn the speed control handle (24)
cedure until voltage remains within
partially counterclockwise until the
27.3 to 28.3 volts range under bat-
varidrive assembly speed is re-
t e r y (battery on-off switch (22)
d u c e d -speed and stop the vari-
"ON") and full load (100-50 fixed
d r i v e assembly by depressing the
l o a d (17-A) "ON") condition.
s t o p button (21-C).
(7) Testing voltage adjustment at 2,000
rpm.
f r o m the low speed driving head
(a) Stop the varidrive assembly, (6)
(5, fig. 7) and mount it on the high
(a) above, and remove the genera-
speed driving head (4, fig. 7). Re-
tor (alternator) from the high
c a l i b r a t i o n of the tachometer indi-
speed driving head (4, fig. 7) and
c a t o r circuitry will not be neces-
p l a c e it on the low speed driving
s a r y if the generator (alternator)
h e a d (5, fig. 7). Recalibrate the
is direct-driven, however, the read-
t a c h o m e t e r indicator circuitry ac-
i n g will be taken from the upper
c o r d i n g l y , (6) (b) a b o v e .
s c a l e on the tachometer indicator
(b) R e p e a t complete test, (4) above.
m e t e r (3) for tests below. If the
g. Final Test and Voltage Adjustment.
generator (alternator) is pulley-
(1) Voltage regulator element - minimum
d r i v e n refer to paragraph
resistance check.
(c) S t a r t t h e v a r i d r i v e a s s e m b l y b y
Note. This test determines whether the
sliding the safety clip (25-B) off
proper coil resistance has been achieved.
