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reverse current setting for the differ-
(8) H o l d the dc volts-millivolts momen-
e n t i a l and reverse current relay as-
tary-on switch (21, fig. 16) up to the
sembly (see
above for specifi-
" R E A D " position and turn the 40-
c a t i o n s for reverse current setting).
o h m field current rheostat (16) fur-
T u r n off the battery switch (20).
ther clockwise very slowly, until ap-
proximately 18 volts are indicated on
(11) C h a n g e the load dc ammeter range
t h e dc voltmeter (4). The needle of
selector switch (5) to the "150A
the dc volt-millivolts meter (4, fig. 16)
( X 3 ) " p o s i t i o n .  P l a c e one 100-50
should deflect to past "0" and to the
fixed-load switch (12-A) in the "ON"
left (negative) side of the dial to ap-
position (be sure the starter test load
proximately 450 millivolts and as the
disconnect switch (10) is in the "ON"
v o l t a g e reading on the dc voltmeter
(4) is increased to approximately 25
(12) H o l d the dc volts-millivolts momen-
v o l t s , by turning the rheostat (16)
t a r y - o n switch (21, fig. 16) up to
f u r t h e r clockwise, the needle of the
"READ" position and note the milli-
dc volts-millivolts meter (4, fig. 16)
volts drop reading across the contacts.
should go back to "0" and to the right
The millivolts drop should be approx-
(positive) to approximately 100 milli-
imately 150 millivolts reading on the
dc volts-millivolts meter (4, fig. 16)
(9) Release the dc volts-millivolts momen-
a n d the reading on the load dc am-
tary-on switch (21, fig. 16). The
m e t e r (1) should be approximately
h i g h e s t dc millivolts reading on the
4 8 amperes. (Refer to manufactur-
dc volts-millivolts meter (4, fig. 16)
e r ' s and/or pertinent publication(s)
is the differential voltage (see
c o v e r i n g the generator control box).
above for specification for voltage
S t o p the varidrive assembly by de-
p r e s s i n g the stop button (21-C).
(10) T u r n the 40-ohm field current rheo-
(13) P l a c e the switches and controls in
stat (16) counterclockwise, very
slowly, to decrease the voltage read-
of the table.
i n d i c a t e d in column
ing on the dc voltmeter (4), observ-
Do not remove any cables, leads, or
i n g the load dc ammeter (1). The
g e n e r a t o r and continue with tests in
c u r r e n t reading on the meter should
p a r a g r a p h e below if the individual
increase, then indicate a reverse read-
control units of the generator control
ing, and then come back to "0" when
b o x require checking and/or reset-
t h e relay opens.  T h e maximum re-
t i n g adjustments.
v e r s e current reading attained is the
Note. The key numbers shown below in parentheses in this section refer to figure 47 except where otherwise
Section Xl.
field. For detailed description refer to TM 9-
129. Description
7003. TM 9-2920-225-35. and TB 9-2300-
T h e Leece Neville Company 100-ampere
g e n e r a t o r (alternator) (figs. 48, 50, or 52) is
130. 100-Ampere
Generator (Alternator)
u s e d in conjunction with the Leece Neville
Test (Leece Neville Com-
Company generator (alternator) regulator
pany, Pulley
or Direct Driven)
(par. 131).  The generator (alternator) is
test is performed to deter-
a. Purpose. T h i s
pulley-driven or direct-driven, fan cooled, non-
g e n e r a t o r (alternator) is
m i n e whether the
w a t e r p r o o f , and has an internally grounded

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