TM 9-4910-663-12
(18) Observe AC VOLTMETER OUTPUT VOLTAGE meter (M6, fig 2-1) and
(19) When rectifier dc voltage and ac voltage are indicated, ro-
tate AC VOLTMETER OUTPUT VOLTAGE SELECT switch (S28, fig 2-1) to dif-
ferent phases to ascertain balanced phase condition.
(20) Rotate AC AMMETER OUTPUT CURRENT SELECT switch (S25, fig
2-1) to
each of its
positions to
determine balanced phase condition.
(21) Vary alternator speed throughout speed range, closely ob-
serving rectifier dc voltage on DC VOLTMETER OUTPUT VOLTAGE meter
(M2), ac voltage on AC VOLTMETER OUTPUT VOLTAGE meter (M6), and ac
amperes on AC AMMETER OUTPUT CURRENT meter (M5).
(22) Using LOAD SELECTION switches (S17 through S24, fig 2-2)
and MASTER LOAD DISCONNECT switch (S8), apply desired loading.
(23) When required, press AC/DC SYSTEMS EQUALIZER COIL TEST
switch (S35, fig 2-3) and note drop-off of approximately 1.5 to 3.0
volts in output.
(24) Perform tests specified by manufacturer's specifications.
(25) Upon completion of tests, set AC/DC SYSTEMS IGN SW (S33,
MASTER LOAD DISCONNECT switch (S8), and LOAD SELECTION switches (S17
through S24) to OFF.
(26) Reduce varidrive speed to one-quarter speed by turning
SPEED CONTROL (fig 2-4) clockwise, and stop varidrive by pressing STOP
pushbutton switch (S3).
(27) If no further tests are to be performed with test stand,
set circuit breaker switch (CB1, fig 2-5) to OFF.
(28) For manual control of field current (fig 2-15), make sure
that DC VARIABLE POWER SUPPLY 0-32 VDC control (T5, fig 2-4), is fully
Connect harness 48296 (-D)from regulator D binding
counterclockwise.
post (fig 2-3) to black DC VARIABLE VOLT OUTPUT binding post (fig
2-2) Set
EXTERNAL FIELD EXCITER AC
SYSTEM switch (S31) and DC VAR-
Set FIELD CIRCUIT switch,(S32)
IABLE VOLTS switch (S10) to ON.
to MANUAL position and FIELD CURRENT 0-30 AMPS (MAX) control (R26)
fully clockwise. Slowly increase setting of DA VARIABLE POWER SUPPLY
0-32 VDC control (T5, fig 2-4) to control field current.
Testing AC/DC Systems (Internal, Regulator/Rectifier)
e.
NOTE
This test procedure is only a typical test procedure.
(1) Position test stand controls in accordance with table 2-1.
2-42 Change 1