63. Preparing for Tests
64. Application of Test
To prepare the locomotive for these tests, refer to
a. Manually place reverser in forward or reverse
position.
b. The maximum high voltage for the main
ammeters, charging ammeters, and main voltmeters.
generator and traction motors for this equipment is 200
b. Disconnect cab heater from circuit because of
volts. A dielectric test of not less than one minute
internal radio suppression capacitors.
This is
duration shall be applied to all circuits and parts carrying
accomplished by disconnecting wires 99 and N.
current with potential of more than 150 volts.
c. Disconnect all capacitors from the auxiliary
c. The voltage applied to circuits other than motor
generator brushholders to ground.
or generator windings shall be not less than 75 percent
above the normal working voltage; the voltage applied
d. Disconnect voltage regulators from system, due
to windings shall not be less than 50 percent above the
to radio suppression components. This is accomplished
normal working voltage.
by disconnecting leads 30, 31, 32, and 33 from voltage
d. Apply 50 percent over voltage between ground
regulator No. 1 end and leads 34, 35, 36, and 37 from
voltage regulator No. 2 end.
(locomotive frame) and G+ for one minute and note that
no breakdown occurs.
e. Disconnect the grounded lead from the ground
e. Apply 50 percent over voltage between ground
relay cutout circuit breaker.
(locomotive frame) and each traction motor armature
f. Disconnect all indicating lights from circuit.
and field lead connection for one minute and note that
This includes wheel slip indicating light, ground
no breakdown occurs.
alarm light, both engine warning lights, and battery
f. Make a careful examination of any weakness
parallel indicating light.
indicated and remedy all defects before locomotive is
g. Disconnect all battery leads at battery.
put in service.
h. See that all disconnected leads are not
grounded.
Section VII. TRACTION GENERATOR
65. General Data
Type. ...........................Railway, Free Fit Ball Bearing
f. Normal Pole Bores at (Center of Poles (in.)
a. Operating Limits (Maximum).
(1)
Main poles.............................................. 17.180
(1)
Safe rpm ..................................................1,450
(2)
Commutating poles ............................... 17. 500
(2)
Volts ............................................................350
(3)
Amperes..................................................1, 300
66. Description
(4)
Shunt field amperes ...................................11.0
(5)
Battery (auxiliary) field amperes ...................2.0
a. This generator is shunt-wound, direct-current
b. Brushes.
machine of standard railway construction including a
(1)
Brush arms per generator................................6
single, housing-supported, antifriction bearing at the
(2)
Brushes per arm..............................................3
front end. It is arranged to be directly connected,
(3)
Grade of brushes ........................ National AX-5
through a flexible coupling, to the engine flywheel.
(4)
Size of brushes (inches)............. x 1 x 2
(5)
Brush tension (pounds) with
b. The machine is self-ventilated, air being drawn
full length brush....................................6 to 8
through openings at the commutator end, circulated
c. Resistance of Winding (ohms at 25C.)
through the armature ducts and around the field coils,
(1)
Armature.................................................0.0077
then discharged by a fan through air outlets at the
(2)
Commutating field .................................0. 0048
coupling end.
(3)
Series field..............................................0.0029
(4)
Shunt field ................................................19.70
c. Four field windings are provided on this
(5)
Battery field...............................................13.39
machine.
d. Weights (Pounds).
d. The commutating field is a separate winding
(1)
Generator complete ..................................3,125
from the other three.
(2)
Armature and shaft...................................1,255
e. Bearing.
26
