TM 9-4910-663-12
(g) Apply specified load to generator, press MILLIVOLT METER
MILLIVOLT DROP PRESS TO READ switch (S34, fig 2-1), and note millivolt
drop across contacts for a given load. (Refer to manufacturer's test
specifications and procedures. )
(h) Perform other tests required by manufacturer's specifica-
tions.
(i) Upon completion of tests, set MASTER LOAD DISCONNECT
switch (S8, fig 2-2) and FIELD CIRCUIT switch (S32) to OFF.
(27) Reduce varidrive speed to one-quarter speed by turning
SPEED CONTROL (fig 2-4) clockwise, and stop varidrive by pressing STOP
pushbutton switch (S2).
d. Testing AC/DC Systems (28 Volts, 100 to 400 Amperes, Externally
WARNING
When performing tests on AC/DC systems with exter-
nal selenium type rectifiers, be cautious not to
apply overvoltage as this will cause a rectifier
breakdown producing a selenium dioxide gas which
may be toxic if inhaled for a period of time. If
a disagreeable odor such as hydrogen sulfide is
detected, shut down test stand and ventilate area.
Always disconnect rectifier from test stand upon
completion of tests.
NOTE
This test procedure is a typical procedure.
(1) Position test stand controls in accordance with table 2-1.
(2) Using cable assembly, connect alternator to alternator bind-
ing posts on test stand. Using test leads connect alternator output
leads T1, T2, and T3 to ALTERNATOR T1, T2, and T3 binding posts (fig
2-3). Connect test lead D to ALTERNATOR D binding post and test lead
(3) Install rectifier on rectifier mounting brackets (36, fig
2-7) and insert into rectifier chamber (6, fig 4-3) of test stand.
NOTE
Install rectifier so that rectifier plates are
parallel to flow of air, and connectors are facing
outward.
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