TM 9-4910-663-12
(6) Set DC AMMETER FIELD CURRENT RANGE switch (S30, fig 2-1) to
proper setting for generator undergoing test.
(7) Set DC VOLTMETER OUTPUT VOLTAGE SELECT switch (S11, fig 2-1)
to RECT GEN position.
(8) Set FINE CONTROL 0-5 AMPS (MAX) switch (S29, fig 2-2) to ON
or OFF position, depending upon system being tested. ON position is
generally used only for testing transport fleet (automotive type)
generators.
NOTE
FIELD CURRENT 0-5 AMPS (MAX) control (R27, fig
2-2) is rated at 5 amperes; therefore, DC AMMETER
FIELD CURRENT meter (M7, fig 2-1) should be ob-
served carefully and this control should not be
used when field current exceeds 5 amperes. FIELD
CURRENT 0-30 AMPS (MAX) control (R26, fig 2-2) is
used alone when testing combat fleet (aircraft)
type generators, which normally employ a carbon
pile or solid state type regulator.
(9) Open high voltage compartment access door (5, fig 4-3) on
to ON. Be certain to close access door or interlock (S4, fig 2-5) may
keep control circuit open.
(10) Start varidrive by pressing START pushbutton switch (S3,
fig 2-4) and maintaining pressure for not more than 30 seconds.
(11) Adjust varidrive speed with SPEED CONTROL (fig 2-4) until
desired generator speed is indicated on TACHOMETER RPM meter (M1, fig
(12) Set FIELD CIRCUIT switch (S32, fig 2-2) to MANUAL position.
Increase generator field current by rotating FIELD CURRENT 0-5 AMPS
(MAX) control (R27) or FIELD CURRENT 0-30 AMPS (MAX) control (R26), as
applicable, clockwise until proper generator voltage is indicated on
DC VOLTMETER OUTPUT VOLTAGE meter (M2, fig 2-1).
NOTE
Generator voltage will drop off with application
of load. It will be necessary to adjust generator
field current by use of FIELD CURRENT 0-5 AMPS
(MAX) control (R27, fig 2-2) or FIELD CURRENT 0-30
AMPS (MAX) control (R26).
(13)
Set MASTER LOAD DISCONNECT switch (S8, fig 2-2) to ON.
(14) Select desired load by use of LOAD SELECTION switches (S17
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