Tagged With "DC Power"

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Re: Runaway engines - Limiting the top speed

GGG ·
I would not recommend this for a PS-2/3 engine. If a engine has a failure and takes off, this can occur on Lionel engines also under certain circumstances, there is the emergency stop button. For conventional operator just roll the throttle back. Your probably not at full voltage anyway. As far as placing them on a PS-2 engine, the command speed will still not be attained and the system will apply more power via pulses to the motor. This may effect the integrated sounds and smoke output...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
Why did you feel the need to post this "tip" twice? I'm not sure it is all that good an idea anyway, but it sure doesn't need to be presented twice. As GGG says, since the tach is determining the voltage, the logic will just keep cranking up the power until it peaks. I don't know what effect this has, other than limiting the full speed and power of the locomotive, but it's certainly not a good idea.
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Re: Runaway engines - Limiting the top speed

stan2004 ·
Another albeit rare occurrence is a stuck-on motor FET causing a runaway. So if the operator is not near the kill switch or is distracted - perhaps from the cheering at a show when the kids see a potential Casey Jones event. A related "problem" which occasionally comes up is to limit operational speed where the anecdotal scenario is handing the controls to a grandson. A possible option is to limit the track voltage with a variable source which eliminates internal engine modification...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
Without intelligence to drive this "cutoff" circuit, you'd simply be limiting your pulling power for the 99.99% of the time there is no problem with the electronics. I guess I'm not willing to do that. If you limit the voltage so a bare engine would not derail, having half a dozen passenger cars would result in a very sluggish consist. If I really was concerned about this issue, I'd simply use a remote control button on a lanyard around my neck that could simply remove track power. This...
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DCS TIU questions/problems

NHVRYGray ·
New to DCS operations (and the 0 Gauge Forum). Layout size, 41 x 27, 4 mainlines with crossovers and double slip switches laid with Atlas track and growing. Outer main insulated from inner 3 and separated into 5 blocks with 3 feeds each, all switches jumped around. Inner mains all electrically connected due to the double slip switches. TIU (not revision L, but upgraded to 6.1) with TMCC concurrent. TMCC runs fine everywhere. Outer main blocks temporarily wired together by jumping at a...
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Re: DC Problem

andy b ·
Consult the instructions that came with your voltmeter - if you do not you could fry your voltemeter, your transformer, your train or worse - there, I covered my read end. Set the volt meter dial to an appropriate dc voltage setting (dcv) - you probably have a choice of something around 20v. With the transformer on and set to something you think should run the trains, touch the red lead to one track rail and the black lead to the other. You should see the voltage displayed. If the number is...
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Re: DC Problem

JoeV ·
I tested the track. Apparently it's one of the engines. Someone asked what kind of power pack I was using. At first I was using one of those small dc packs you get with ez streets. When the engines went dead, I switched over to a rail power 1300. I should say I have two separate loops connected to the same power pack. When I tested the track with engine A, the track registered almost no power. When I took A off, the power shot up. Engine B which hadn't worked suddenly came to life. So...
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Re: DCS TIU questions/problems

Engineer-Joe ·
What are you using for power?
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Re: DCS TIU questions/problems

NHVRYGray ·
The TIU works fine with short jumpers to a 40in section for programming. Locomotives work fine on that short section after programming. Power source is the right side of a MTH Z4000 set at 18 volts. I have seen some talk of light bulbs to "tune" the signal. Please advise on the filters you mention. Are blocks completely isolated or just center rail isolated from each other? if insulators are required, I would think even a small loop could have problems. Books are due in tomorrow, looks like...
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Re: DCS wifi power

Barry Broskowitz ·
Anyone know if it is alright to leave the DCS wifi unit powered up continusly so you don't have to wait for a router connection? It's just like any other piece of electronics or your computer. Same rules apply. Also, note that if the WIU is connected to a Rev. L TIU via the TIU's USB port, the TIU will also be on continuously, however, there will be no DCS control avail;able since the USB port doesn't power the DCS signal generators.
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Re: Connecting power to TIU, thought I would ask before risking it

Barry Broskowitz ·
Frank, This excerpt from the DCS WiFi Companion, page 85. should provide some insight: 1. External TIU Power Providing Power to the TIU Like any other electronic component, the TIU requires a power source. MTH designed the TIU so that it can be powered in two different ways. One way is to use the track power that is present at the inputs to TIU Fixed Channel #1. This power source is available whenever the O gauge operator is running trains on tracks connected to Fixed Channel #1. Another way...
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Re: How to tell if MTH DCS?

GGG ·
But having a 10 pin does not mean it is PS-2. As mentioned further up, conventional loco sounds also used 10 pin. Conventional MTH engines can change direction with direction button or moving throttle to zero and back up. Both do the same thing. Remove power for a second or two allows the conventional reverse unit to sense the change and go to the next state. Neutral, forward, neutral, reverse, neutral......... G
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Re: DCS--Fixed 1 channel

gunrunnerjohn ·
If you're getting power out of FIXED #1, and it's just not seeing DCS locomotives, it'll probably have to be repaired. Of course, this assumes you have enabled DCS on the channel.
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Re: DCS--Fixed 1 channel

Gregg ·
Menu/System/ Dcs set up/ AON....... turns the dcs signal on to all channels.... He must be using an aux power supply if Fixed 2 works?
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Re: DCS--Fixed 1 channel

H1000 ·
Barry, Before opening the TIU, Couldn't he just unplug power from the AUX power input and test to see if the TIU will power on through FIXED 1 input? If it powers up, the fuse must be good, right? H1000
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Re: DCS--Fixed 1 channel

JimRK ·
Thanks for the responses. I've had the TIU for several years. It is version 'I' and was returned for a factory upgrade. MTH suffixed a silver dot to the 'I' verifying the upgrade. It has always worked flawlessly and yes, I do power it through the aux port. When I power up Fixed 1-in, my voltmeter shows nothing coming out of Fixed 1-out (dead channel?). I opened the case removed the fuse and it is fine. I switched fuses around between 1 and 2 to see the result. Same thing as before, power up...
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Re: DCS--Fixed 1 channel

gunrunnerjohn ·
What version is the TIU? Look on the bottom of the case. If the fuse is good, you should at least get power through the channel. Other things that can affect it are loose nuts on the input and output connections or an overload has cooked a trace on the board.
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Re: DCS--Fixed 1 channel

JimRK ·
John you may have nailed it 'fried trace'. When testing with my voltmeter I removed the 'power-out cables' and took readings right on the terminal posts. This sounds like it will have to go back...Advise!
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Re: DCS--Fixed 1 channel

Dave Zucal ·
I must have a bad TIU then John. If I power the TIU via AUX and set all channels for DCS, using a brick connected to the variable channel input and out put to the track, my engines will start upon powering up the variable channel.
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DCS wifi power

Recovered ·
Anyone know if it is alright to leave the DCS wifi unit powered up continusly so you don't have to wait for a router connection?
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DCS--Fixed 1 channel

JimRK ·
I have a HO switching layout using a DCS controller and wifi. Both work just fine. Due to a 'short', fixed 1 is now none functional, with the message 'cannot find TIU'? I moved power-in and power-out to fixed 2 and everything works great. I checked all TIU fuses and they are fine. Changed back to 'fixed1''and everything was again none functional. According to ' DCS COMPANION 3' the problem is in 'fixed1' channel. Is there a reset involved or do I have to return the TIU to MTH? The answer may...
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Connecting power to TIU, thought I would ask before risking it

ChooChoo1972 ·
Hi all, I have been reading the documentation for the DCS TIU and the WIU a few times over. I think I understand most of it but I have a few questions that I thought I would ask before diving in. a. I have two tracks that are both physically and electrically isolated. I assume I can connect one to the fixed track 1 terminals of the TIU and the other to fixed track 2 terminals. Is that OK so far? b. I have a Z1000 brick which I can attach to the fixed power one terminals on the TIU. To power...
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DC Problem

JoeV ·
I have a three rail O scale layout.  On the Layout I have DC N scale trains running around a playground.  When I set it up it was working fine.  Last week the engines started running slower, then stopped.  I changed out the DC transformer to another one. Same result.  I have a voltage meter but honestly don't know how to set it the find out if the track is getting power.  Anyone have any ideas??? Thanks
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Re: New to DCS

pittsburghrailfan ·
If the TIU and remote were purchased new from a hobby shop, they should be equipped with either DCS version 5.0 (Basic wifi app capable) or version 6.0 (premium app capable). If you purchased your DCS equipment used or mint, power up your DCS handheld and check what version of software is installed when the remote initializes. In my experience, as long as you don't wish to control engines from your smartphone, any version of DCS 4.0 and up generally works fine. However, if you plan to run...
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Re: New to DCS

Jim Harrington ·
Up and running. Very cool. Almost too many features! The next question is a little advanced from where I am now... Is there a downside to using transformers with different wattage ratings, i.e. Postwar ZW and KW for different power districts, with the consideration that trains will be crossing from one to the other? (other than the peak load should not exceed the capacity of the lesser of the two). Thanks.
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Re: New to DCS

gunrunnerjohn ·
One item to watch. Make sure all the transformers are phased and the voltages are all set very close to each other. As you cross power districts, the adjacent transformers will be paralleled, if the voltages are materially different, you can get fireworks.
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Re: I could use some help

Marty R ·
Hi 1) power the TIU at the aux port with a 14-18V wall wart. 2) go to the DCS site and download the DCS loader and latest TIU and wiu firmware (gee,I’d hope stock from the last few months would have the latest). If you bought it at a local hobby shop, maybe they can help. 3) power up the TIU, give it a minute or 3 4) power up the wiu you should then get all the lights.
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I could use some help

Dave B72 ·
My beautiful wife bought me a wifi dcs (#50-1036 i think) for christmas! All the videos i have seen online show basically a plug and play system. I guess i am doing it wrong. Both the TIU and the WIU came in the same package, with the power cord for the WIU and the usb cable. They don't seem to be talking. All hooked up according to the instructions, z-500 power supply for the TIU, transformer power to fixed 1 in, red led on on the TIU, WIU starts up and goes through the flashing lights and...
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Re: Runaway engines - Limiting the top speed

pro hobby ·
The diodes that I install in my engines are rated for 6 amps. The current draw for most can motors is about 2 to 3 amps.
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Re: Runaway engines - Limiting the top speed

pro hobby ·
The posting was NOT intended to be placed in duplicate. I do not know how this happened.
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Re: Runaway engines - Limiting the top speed

pro hobby ·
The way the DCS system adjusts the speed is to provide whatever voltage is needed to the motors to maintain RPM as detected by the tachometer system. As more cars are added to the train or as the engine approaches a steep incline the motor would naturally slow down (RPM would go down). When the DCS system detects a reduction in RPM it compensates by increasing the voltage until the RPM is reached. For any given engine the final track speed is dependent on the engine gear ratios as well as...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
I'm fully aware of how speed control works, the discussion is about the value of adding diodes to reduce the motor voltage. IMO, it's not a worthwhile addition. It's a solution to a problem that really doesn't exist.
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Re: Runaway engines - Limiting the top speed

GGG ·
I bought a drag racing parachute for my car in case the throttle stuck, the brakes failed, I couldn't shift into neutral, and the ignition switch failed:-) How about software the knows what speed is ordered, and when voltage is ramped up to full to compensate it realizes with still no speed change that something else is wrong and commands the engine FET to a preprogrammed slow speed voltage setting. MTH has to do this. Or a device the records tach output and if it goes to zero opens one of...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
Originally Posted by GGG: Stan or John could built this circuit. I just need to patent the idea in case it is a hit! :-) G Why do I not like this idea? Truthfully, the tach sensor would be pretty easy. Monitor the motor voltage and if it goes past around 4-5 volts and the tach isn't running, shut things down.
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Re: Runaway engines - Limiting the top speed

Dale H ·
Originally Posted by GGG: I bought a drag racing parachute for my car in case the throttle stuck, the brakes failed, I couldn't shift into neutral, and the ignition switch failed:-) How about software the knows what speed is ordered, and when voltage is ramped up to full to compensate it realizes with still no speed change that something else is wrong and commands the engine FET to a preprogrammed slow speed voltage setting. MTH has to do this. Or a device the records tach output and if it...
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Re: Runaway engines - Limiting the top speed

GGG ·
Dale, I remember a few previous discussions on the forum about whether the train should stop or continue. Some would not want an engine stopping in a tunnel or inaccessible part of their layout. Others might. On a serious note, adding safety feature that mean more code, or hardware can just drive up the price and complexity. Both Lionel and MTH provide the kill switch, or a simple direction change brings this casualty to a stop. For conventional operators rolling the throttle back is all it...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
GGG, like I said earlier, this is really a question that should have never been asked.
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Re: Runaway engines - Limiting the top speed

Dale H ·
Originally Posted by GGG: Dale, I remember a few previous discussions on the forum about whether the train should stop or continue. Some would not want an engine stopping in a tunnel or inaccessible part of their layout. Others might. On a serious note, adding safety feature that mean more code, or hardware can just drive up the price and complexity. Both Lionel and MTH provide the kill switch, or a simple direction change brings this casualty to a stop. For conventional operators rolling...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
We have to remember these are not life threatening items, so the remote risks of a runaway probably don't justify the development expense of adding a limit feature. I agree that it should be possible to do this in software, though it's not quite as simple as one might imagine. The amount of current to get the locomotive moving at the commanded speed can very widely, depending on the load and the grade.
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Re: Runaway engines - Limiting the top speed

Dale H ·
Originally Posted by gunrunnerjohn: We have to remember these are not life threatening items, so the remote risks of a runaway probably don't justify the development expense of adding a limit feature. I agree that it should be possible to do this in software, though it's not quite as simple as one might imagine. The amount of current to get the locomotive moving at the commanded speed can very widely, depending on the load and the grade. Not that complicated. If the tach reader is not being...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
It's not that simple either Dale. The tach reader is not active when the engine is stopped. And, the only way to know the engine is not stopped is by looking at the tach reader output! The motors may draw considerable current before the engine starts moving, depending on the load and grade. Remember, this has to work in the most extreme situation, say 35 cars going up a 3.5% grade, etc.
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Re: Runaway engines - Limiting the top speed

Dale H ·
Originally Posted by gunrunnerjohn: It's not that simple either Dale. The tach reader is not active when the engine is stopped. And, the only way to know the engine is not stopped is by looking at the tach reader output! The motors may draw considerable current before the engine starts moving, depending on the load and grade. Remember, this has to work in the most extreme situation, say 35 cars going up a 3.5% grade, etc. It should be,that is the problem,poor design. there should always be...
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
If you're saying they should think of every eventuality, however remote, and design for it, I'll have to disagree. I'd rather not pay $5,000 for an $800 locomotive!
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Re: Runaway engines - Limiting the top speed

RJR ·
Runaways haven't been a real hazard on my layout in the 10 years+ that I've had DCS. It's easy to teach grandchildren the value and purpose of the red button, and they've never been reluctant to use it.
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Re: Runaway engines - Limiting the top speed

gunrunnerjohn ·
When running several trains together with both remotes, my grandson loves to punch the red button and stop everything. I can tell he's getting bored when he keeps doing it time after time, that signals the end of train time.
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Re: DC Problem

JoeV ·
Thanks Andy, I'll check it out
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Re: DC Problem

B Smith ·
I think the reference to 20v was just for selecting the appropriate scale on the voltmeter (0 -20 DC range).
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Re: DCS TIU questions/problems

Barry Broskowitz ·
Gray, Your wiring is suspect. Further, I had some difficulty understanding exactly how you're wired. I suggest that you use a simple star wiring method: with center rail-isolated track blocks that have one and only one connection to a TIU channel, via a terminal block. The DCS Companion 3rd Edition and The DCS WiFi Companion 2nd Edition both have detailed, illustrated discussions of how to use star wiring effectively. This and a whole lot more about DCS is all in MTH’s “The DCS Companion 3rd...
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Re: DCS TIU questions/problems

NHVRYGray ·
Thanks Barry Books are due in 4-4. Luckily nothing is secured permanently yet as far as wiring. Looks like I have some reading to do.
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Re: DCS TIU questions/problems

David Minarik ·
What TIU do you have? It also sounds like you have more than one feed to your blocks.
 
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