TM 9-4910-663-12
(M7, fig 2-1) should be observed carefully and this
control should not be used when field current ex-
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 nor-
mally use a carbon pile type regulator.
i. DC Variable Voltage Supply.
(1) A DC VARIABLE VOLTAGE POWER SUPPLY (T5, fig 2-4) is avail-
able for the testing of relay pick-up and drop-out voltages.
supply is rated at 0 to 32 volts dc, 15 amperes. This power supply
may be used with or without the varidrive running and is independent
of the batteries.
(2) Associated with this power supply circuit is the VAR posi-
tion of DC VOLTMETER OUTPUT VOLTAGE SELECT switch (S11, fig 2-1).
When this switch is positioned in the VAR position it will indicate
the output voltage of the DC variable power supply.
(3) Also provided with this circuit are two DC VARIABLE VOLTS
OUTPUT binding posts (fig 2-2) and a DC VARIABLE VOLTS switch (S10).
(4) To operate the variable dc voltage power supply (T5, fig
(a) Position all switches and controls in accordance with
(b) Connect the relay coil by use of test leads to DC VARIABLE
CAUTION
To prevent damage to components being tested always
ascertain component characteristics as published by
component manufacturer prior to the application of
power.
(c) Verify that DC VARIABLE POWER SUPPLY 0-32 VDC control (T5,
(d) Position DC VOLTMETER OUTPUT VOLTAGE RANGE switch (S12,
(e) Position DC VOLTMETER OUTPUT VOLTAGE SELECT switch (S11)
to the VAR position.
(f) Open the high voltage compartment door and position main
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