Index Locomotives - books DIESEL LOCOMOTIVE OPERATING NO. 2315 for MODELS F9, FP9, FL9 - manual 1997 year
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ELECTRICAL
F9-5-657
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F9-5-657
ELECTRICAL
Transition Circuit (Fig. 5-23)
In starting a train, the traction motors are connected in series-parallel. To
connect the traction motors in series-parallel and move the locomotive, pro-
ceed as follows:
1. Place "Control" switch "ON" (current now flows through PC wire).
2. Place isolation switch in "RUN."
3. Move selector lever to No. 1 position.
4. Move reverse lever to forward or reverse (current now flows
through the FO or RE wire, depending on position of reverse lever).
5. S13 and S24 contactors close (traction motors connected in series-
parallel).
6.
Place "Engine Run" switch "ON."
7.
Place "Generator Field" switch "ON."
8. Open throttle to run position 1 or higher (current now flows through
GF wire).
9. SF and BF contactors close (locomotive moves).
Series-Parallel to Series-Parallel Shunt (Transition 1-2)
As train speed increases, throttle in Run 8 position, automatic forward tran-
sition takes place as follows:
1. When the proper ratio of main generator voltage to main generator
current has been reached, FSR will pick up.
(Approximately
19.5 MPH in throttle eight or 18 MPH at part throttle.)
2. FSR contacts A-B close to pick up FS.
3. FSR contacts E-F close recalibrating the dropout of FSR through the
20,000 ohm resistor.
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4. FS interlocks A-B open to remove the bias around the PTR
coils, j-K and L-M, allowing them to be energized when the
proper ratio of main generator voltage to main generator current
has been reached. The function of the 1000 MFD capacitor in
parallel with the PTR coils j-K and L-M, is to delay the pickup
of PTR to allow time for the main generator voltage to drop be-
low the pickup of PTR after the motor fields have been shunted.
If the pickup of PTR were not delayed, the locomotive would
go into parallel below the proper speed, resulting in cycling.
Series-Parallel Shunt to Parallel (Transition 2-3)
1. At approximately 28 MPH in either part or full throttle, PTR
will pick up since the proper ratio of main generator voltage to
main generator current will have been reached.
2. PTR contacts A-B close to pick up TR since FSR contacts C-D
are closed.
3. PTR contacts E-F close recalibrating the dropout of PTR
through the 7500-ohm resistor.
4.
TR contacts G-H close raising the dropout of FSR by energizing
the FSR coil M-L (low voltage) in a direction opposite to that of
the FSR coil J-K.
5. TR contacts A-B close establishing a holding circuit to TR
around FSR contacts C-D.
6.
TR contacts L-M open to drop the SF contactor.
7.
SF
interlocks A-B open to drop out the
BF
contactor. The main
generator voltage will now decay at a rate controlled by the
100-ohm shunt field discharge resistor.
8. TR contacts j-K open, but S13 is held energized by FS inter-
locks C-D.
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F9-5-657
9.
TR contacts C-D close, partially setting up a circuit to P1 and P3 con-
tactors.
10. When the main generator voltage decays sufficiently, FSR drops out.
11. FSR contacts E-F open removing the recalibration from the FSR coil
j-K.
12. FSR contacts C-D open, but TR is held in by TR contacts A-B.
13. FSR contacts A-B open, dropping FS contactor.
14. FS interlocks C-D open to drop out S13.
15. S13 interlocks A-B close to pick up Pl and P3.
16. Pl interlocks C-D open to remove the bias from the FSR coil M-L
(low voltage).
17. Pl interlocks A-B open to drop out S24.
18. S24 interlocks A-B close to pick up P2 and P4.
19. P4 interlocks E-F close to pick up SF contactor since TR contacts E-F
are now closed.
20. SF interlocks A-B pick up the BF contactor and the transition is com-
plete.
Parallel to Parallel-Shunt (Transition 3-4)
1.
At approximately 55 MPH train speed, FSR again picks up at the
proper main generator voltage to main generator current ratio.
2.
FSR contacts A-B close to pick up FS.
3.
FSR contacts E-F close recalibrating the dropout of FSR through the
20,000 ohm resistor and the G-H interlock of P4.
4.
FS interlocks A-B open; however, the bias around j-K and L-M coils
of PTR was already removed by the G-H contacts of PTR in tran-
sition from series-parallel shunt to parallel.
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ELECTRICAL
Parallel Shunt to Parallel (Transition 4-3)
Assume that the locomotive is running in parallel shunt (Transition
4) in throttle eight and decelerates due to an upgrade.
1.
As the train speed reaches approximately 42 MPH, FSR drops
out.
2.
FSR contacts G-H close to energize FSR low voltage coil M-L.
This raises the ratio necessary to pick up FSR and prevents cy-
cling due to transient high voltage.
3.
FSR contacts C-D open, but TR is held in by TR contacts A-B.
4.
FSR contacts E -F open to remove recalibration from FSR coil
j-K.
5.
FSR contacts A-B open to drop the FS contactor and remove
the 48% shunt from the traction motor fields.
6.
FS interlocks A-B close around the PTR coils j-K and L-M, but
since PTR contacts G-H are open, PTR is not shunted out.
7.
FS interlocks E-F open removing the bias from the FSR coil M-
L (low voltage).
If the locomotive continues to lose speed, the ratio of main genera-
tor voltage to main generator current will rise to drop out PTR and ini-
tiate further backward transition.
Parallel to Series-Parallel to Series-Parallel Shunt (Transition 3-1-2)
1.
As the train speed reaches approximately 24 MPH in throttle
eight, PTR will drop out.
2.
PTR contacts G-H close to short out the PTR coils and prevent
them from picking up due to transient high voltage conditions.
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F9-5-657
3.
PTR contacts E-F open to remove the recallbration from the
7500 ohm resistor.
4.
PTR contacts A-B open to drop out the TR relay.
5.
TR contacts E-F open to drop out the SF contactors.
6.
SF interlocks A-B open to drop out the BF contactor. Main gen-
erator voltage will now decay at a controlled rate.
7.
BF interlock E-F closes but has no effect since FS interlock A-
B had closed previously.
8.
TR contacts C-D open. Pi and P3 drop out approximately 0.1
second later due to the rectifier wired across their coils.
9.
P1 interlock A-B closes to pick up S13 since TR contact J-K is
closed.
10. S13 interlocks A-B open to drop out P2 and P4.
11. P2 interlocks A-B close to pick up S24. The traction motors are
now connected in series-parallel.
12. S13 and S24 interlocks G-H close to pick up the SF contactor,
since the TR contacts L-M are closed.
13. SF interlocks A-B close to pick up the BF contactor.
14. As the generator voltage rises as a result of the reclosing of SF
and BF, FSR picks up which picks up the FS contactor.
15. FS interlocks A-B open to remove the shunt around the PTR
coils J-K and L-M, but the 1000 MFD capacitor does not allow
PTR to pick up for approximately 3.0 seconds. In effect, the
coils are shunted until the capacitor is fully charged.
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Assuming the locomotive continues to decelerate in throttle
eight due to the grade, at approximately 17 MPH the FSR relay will
drop out to initiate the final step of backward transition.
Series-Parallel Shunt to Series-Parallel (Transition 2-1)
1.
FSR drops out and its G-H contacts close to energize the FSR
low voltage coil M-L. This raises the ratio necessary to pick up
FSR and prevent cycling due to transient high voltage.
2.
FSR contacts C-D open but this has no effect since PTR con-
tacts A-B are already open. 3. FSR contacts E-F open to remove
the recalibration from FSR coil J-K.
4.
FSR contacts A-B open to drop out the FS contactor and re-
move the 48% shunt from the traction motor fields.
5.
FS interlocks A-B close and short out the PTR coils J-K and L-
M since PTR contacts G-H are closed.
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