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To set the selector to 4; just keep pushing the selector lever to the right or you can use the '.' key to increase the selector and use the "," to decrease the selector. I tend to use the keyboard shortcut keys for throttle, ind brake, auto brake and reverser.
On the SD40 the Selector Lever and the throttle are two different things. The SD40 has dynamic brakes and the Selector Lever on 1-4 means the dynamic brakes are set to off and the electric motors are working. When you set the Selector Lever to 'B' then the dynamic brakes are set on and the motors now work as generators.
To use the dynamic brakes, set the throttle to 0, set the selector to B and then wait a few seconds or until you see the amp meter dive or turn orange and then apply throttle. Because your selector is in the 'B' position adding throttle is really adding brakes. The more you increase the throttle the more you increase the braking power.
When done using the dynamic brakes and you need power, put the throttle in the 0 or idle position, use the Selector switch and set it to '1-4', wait a few seconds and then apply power. With the Selector switch in the '1-4' positions you will now be applying power to the electric motors.
As for the F7, I'm not sure what your referring to when you say manual transitions?
what I wanted to know is HOW do I know which setting to put it in. is there a specific setting for a specific time?
as for the F7, you can set the transitions to manual on the back wall which (sometimes) gives you 2 more transition lever settings. I just need to know how they work because when I set it to 1 I get WAY more power than when it's on auto.
I'm guessing that the SD's Selector is the same as the F7 Unit Selector and refers to the number of Engines attached to the lead. In the scenario "something or other Ascent" there are 4 units and the instructions are to set the Selector to 4.
When you need to use the dynamic brakes you have to bring the selector all the way to the 'B' selection.
As for the F7, Series Parallel for regular duties and Series Parallel Shunt for shunting duties. The rest I didn't even know about but will take a look next time I'm in the F7 cab.
the unit selector is for how many engines... this explains a LOT I thought it was a transition lever, I was using it like gears on a CL101. LOL
I think i understand. You're referring to the F7 Transition lever. Now I have not played with the back wall at all so this is all a guess. The other two setting Series and Series Shunt sounds like the electrics are in series which means if one engine shuts down and breaks the circuit, all the engines would shut down, where the default; auto setting; is parallel so I would assume it's running paralles ciruit so if one engine breaks the circuit the other engins still keep running. This might have something to do with the unit selector as well but I have no idea why or when you would choose Series over Parallel.
On the default back wall setting; auto you say the two settings for the Transition lever are 1) Series Parallel and 2) Series Parallel Shunt. To run a train any distance use 1) Series Parallel and for yardwork, coupling and uncoupling as you set up consists then use 2) Series Parallel Shunt.
Next time I'm in the F7 I'll check out that back panel.
The specific settings are based on gear ratio (the locos came with different ones) and speed.
There's a speeds table in the real world F7 manual if you google "emd F7 manual" and look at/downlaod the first PDF link.
F7 has 4 drive motors, one per axle.
1 "series parallel" two motors are put in series, the 2 series packages are then used in parallel. With nominal 600V drive power each motor gets only 300V, thus the current(ampere) that passes is kept within the permitable limit at low speeds. Otherwise (with 600v per motor) the motor would take to many amps overloading the system/frying the generator.
2 "series parallel shunt" same as above, but the magnetic field that is generated in the motor is reduced in strength by using a shunt (kinda electronic on/off switch ancestor to transistors) to shorten some loops of the field generating wire. Give the motor less torque and more rpms than without
3 "parallel" put all 4 motors in parallel to give them 600V, they now rotate faster than in 1 and 2 and each motor uses less amps, so the total is low enough to not overload the generator
4 "parallel shunt" for high speed, the motors are shunted as in 2 but this time with 600V per motor
As others have mentioned: depending on the gearing the locomotive has installed the speeds at which it is necessary to switch between the modes are at diffrent speeds. With automatic the switch between modes is made automatic. Not sure why you can select position 1 and 2 in automatic mode, i didnt see that. maybe position 1 limits to just that and poistion 2 enables the automatic change between all the modes, which is why tutorial says we need to put postion 2 when in automatic?
The correct "switching" speeds are also indicated on the ampermeter (according to real world F7 manual), but i am not sure if its visible in game.... ill take a look .
That was extra helpful. I think the tutorial wants you to place the Transition lever to "series parallel shunt" because we are working "yard duties". Which leads me to think that maybe the tutorial has got it backwards.
If your information is from real world then you would think that "series parallel shunt" where you're getting higher rpm but lower torque would be used more for long haul and the low rpm with high torque; series parallel; would be used for "yard work" but my logic may not be correct here.
The Selector switch is the most misunderstood control on the SD40 CRR. The Selector Switch's primary purpose in an actual EMD SD40 is the operation of the dynamic braking system. Its purpose is to configure the dynamic braking system for a specific number of 'physically and electrically connected' locomotives (coupled). The system will then uniformly apply the dynamic braking action across the coupled units.
There is a unique circumstance whereby the selector switch can impact the power settings (transitions) of the coupled locomotives. There is an optional configuration for the Selector Switch for instances when it is necessary to control transition on trailing units not equipped for automatic transition. I cannot speak for TSW or Dovetail Games but I believe this type of consist is coded into at least one of the route scenarios, but not all. Admittedly, my testing of that situation was cursory at best.
Since it is necessary to count the locomotives in order to get the benefit of the uniform dynamic breaking, setting the Selector Switch accordingly should also accommodate any non-automatic locomotives involved in the consist. (i.e. fixes potential power issues )