Index Locomotives - books DIESEL LOCOMOTIVE OPERATING NO. 2315 for MODELS F9, FP9, FL9 - manual 1997 year
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ELECTRICAL
F9-5-657
The "NVR" dropping out can be
caused by (1) engine stopped, (2) auxil-
iary generator fuse (battery charging)
blown, (3) auxiliary generator field fuse
blown, or (4) alternator field fuse
blown. The alternator failure alarm will
not operate when the isolation switch is
in the START position.
521
Electrical Circuits
To become
better acquainted with the electrical
system of the F9 type locomotive, a
step by step description (through the
use of schematic diagrams) of the more
important electrical circuits involved
with the operation of these locomotives
will be given.
The
Electrical
Symbols
and
Legend used on these diagrams will be
found at the end of this section. One
thing that might bear mentioning before
starting on the circuits, is interlocks and
their identification.
A relay, or contactor, as used on a Diesel locomotive, consists
of an operating coil, a set of main contacts and/or several auxiliary con-
tacts called interlocks. The interlocks can be normally open or closed
with the operating coil de-energized (dropped out). Energizing (picking
up) the coil will change the normal position of the relay interlocks. See
Fig. 5-18.
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ELECTRICAL
Thus, an interlock shown on the wiring diagram in a closed po-
sition will open when its respective operating coil becomes energized
(Example: P1
ab
interlock normally closed will open when the Pl contac-
tor operating coil is energized.)
When the coil is de -energized (drops out) the interlock returns
to its normally closed position. Similarly, an interlock shown on the
wiring diagram in an open position will close when its respective oper-
ating coil becomes energized (picks up). When the coil is de-energized
(drops out) the interlock will return to its normally open position.
The circuits traced will be those on the Electro-Motive Model
F9 locomotive. Similar circuits are used on other General Motors lo-
comotives thus all others will be very much the same.
On the diagrams it will be noted that the bottom wire is a com-
mon wire leading to the negative side (-) of the battery. Many devices
NO POWER APPLIED TO COIL
WITH POWER APPLIED TO COIL
COIL IS DE
-
ENERGIZED (DROPPED OUT)
COIL IS NOW ENERGIZED (PICKED UP)
INTERLOCK AB IS NORMALLY OPEN
INTERLOCK POSITION
CHANGE:
INTERLOCK CD IS NORMALLY CLOSED
AB IS NOW CLOSED
CD IS NOW OPENED
Operation Of Interlocks
Fig. 5-18
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F9-5-657
are connected to this wire and hence it will not be necessary to trace all
of the circuits back to the source.
Fuel Pump Circuit (Fig. 5-19)
After all preliminary steps have been followed preparatory to
starting the locomotive, the first circuit that is energized is that of the
fuel pump.
Starting at the positive (+) side of the battery continue through
the main battery knife switch, ammeter shunt, the control knife switch
to the 30-ampere control fuse. Going through the fuse and through the
"Control" (and fuel pump) switch on the engineman's control stand in
the cab, continue on the PC wire which runs throughout the locomotive,
to the right to the first intersection. Follow this PC wire down to the
throttle control stand where a roller type switch is energized when the
throttle is in IDLE position. From here go through the PCS contacts to
the PCR coil. Note that the PCR interlock CD above will now close
establishing a holding circuit so PCR can stay energized after throttle is
opened. From the PCR coil the circuit is completed back to the negative
side of the battery through the 80-ampere control fuse, control knife
switch and main battery switch.
Starting back at the "Control" (and fuel pump) switch again follow the
PC wire. This time go to the right as far as possible. The PC wire then
goes down to the FPC coil which closes the interlocks AB and CD of
the FPC in the Fuel Pump Motor Circuit.
Now coming from the
positive side of the control switch go down through a 10-ampere fuel
pump motor fuse, the AB and CD of the FPC, the fuel pump toggle
switch on the Engine Control Panel directly to the fuel pump motor.
The fuel pump motor starts and fuel oil is now being fed through the
system.
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Engine Starting Circuit (Fig. 5-20)
The next circuit in the sequence will be to start the engine
through the starting circuit.
From the PC wire of the control circuit previously established
follow the PC wire down through the AB finger of the isolation switch
which will be closed when the isolation switch is in START position.
From there go through the START push button to the starting contactor
coil (GS). This coil now closes the GS contactor in the high voltage
system. Battery current now flows from a positive connection just be-
low the main battery switch, through a 400-ampere starting fuse, the
GS contactors positive terminals, the main generator armature, the dif-
ferential, compensating, commutating and starting fields of the main
generator, the GS contactors negative terminals back to the negative
side of the battery. The main generator now acting as a motor cranks
and starts the Diesel engine.
The START button can now be released
which breaks the circuit to the GS coil which allows the GS contacts to
open disconnecting the battery from the main generator.
Engine Starting Circuit
Fig. 5-20
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ELECTRICAL
Locomotive Control Circuit (Fig. 5-21)
To get the traction motors connected to the generator, start from
the "Control" switch and go down the PC wire to the second terminal
point which connects to the "A" terminal of the EX contact. When the
throttle is opened to the #1 position the phenolic cam drum in the con-
troller energizes a roller switch which in turn closes the "AB" contacts
leading to the EX wire. The circuit is now complete through the drum
and out this EX wire to the generator field switch. Closing this switch
then sends current up to the selector drum through the GF wire. All
contacts of this drum are open when the selector lever is in the "OFF"
position.
By placing the selector handle in the #1 position the drum acti-
vates a roller switch which closes the uppermost "CD" contact in this
group. The flow of current can now proceed from the "D" terminal to
the right of the reverser section of the control stand and is stopped by
another set of open contacts. As the reverse lever is moved to the for-
ward position the lower "CD" contact closes and current now flows
through the FO wire and down to the RVR-F coil. This coil causes the
reverser in the high voltage system to move to the forward position.
Tapping off the FO wire above the RVR-F coil another circuit is
established to the power contactors by way of a path through the "CD"
of RVR, "GH" of IS, "AB" of GS, "AB" of Pl and "JK" of TR to the
S13 coil. just above the interlock "JK" of TR another wire is tapped off
to the right and down through the "AB" of P2 to the S24 coil.
These coils close the S13 and S24 contactors in the high voltage
system thereby completing the connection of the traction motors to the
generator. This can be seen by looking at the left portion of the wiring
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diagram. Starting at the positive side of the main generator go to the
left through the generator shunt, down to terminal GS2, turn to the right
at this point and go through the reverser contacts, indicating meter
shunt, field and armature of the #2 traction motor, down and to the left
through the S24 contactor, down and to the right through the reverser
contacts, field and armature of #4 traction motor, wheel slip control re-
lays, to terminal GN4. At this point go up and turn back to the generator
fields. A similar circuit connecting traction motors 1 and 3 to the main
generator exists by the S13 contactors being closed.
Excitation Circuit (Fig. 5-22)
After connecting the traction motors to the generator the next
step is to excite the generator so that it would start putting out power.
This is accomplished by the excitation circuit. When the throttle is
opened current flow begins in the GF wire.
Beginning at the generator field switch follow the GF wire
around and down through the "EF" of IS and "GH" of GR. Continue
straight down through "LM" of TR, "GH" of S13 and "GH" of S24
(which will now be closed by action of the power contactors closing in
the previous circuit), AB of WS13 and WS24 to the SF coil which
closes the SF contactors in the main generator circuit. Tapping off of
the GF wire between the "GH" of GR and "LM" of TR the current goes
to the right and down through the "AB" of SF (which will be closed by
action of the SF coil just energized) and the "AB" of WSS to the BF
coil. The BF coil closes the BF contactor between the battery field and
load regulator. The BF contactor together with the SF contactors now
completes the excitation of the generator.
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