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Convert Prof Motor controller brake to coast?


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#1 mark

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Posted 07 February 2019 - 04:33 PM

I have a PMTR 2111 controller with sensitivity and brake controls I don't use brakes and was wondering if the brake control could be converted to coast control.

I race HO cars super stock through unlimited. I also found out a few races ago that during a compression molded poly modified race that the controller got hot in the upper right hand corner. I am planning on hooking up a small computer fan to try and keep the heat down. The hotter the controller got the more erratic it became.

I have emailed Professor Motor three times about this mod, they said it could be done, and that someone would get back to me. Well, it's been three weeks and I haven't heard back from them so I thought maybe someone on this site could help me.

Also is it possible to put a choke control on these controllers?

I also own an OS3 all pro controller that I put up for sale on eBay yesterday. I tried and tried to get used to it, but it just doesn't fit my driving style I guess.
Mark Heckman




#2 Jim Difalco

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Posted 07 February 2019 - 11:00 PM

Mark, you are asking a lot from a basic controller. The excessive heat is from the high performance motors and adding a coast feature means that the transistor will be running even more. Adding a choke for unlimited cars means the transistor will always be on. The erratic behavior is because the transistor is shutting down because of the heat.


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Jim Difalco
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#3 Ramcatlarry

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Posted 07 February 2019 - 11:06 PM

From what you describe, that is the transistor location for the excess heat.  The motor might be too hot for that level transistor.  The "PM Super Pro # 2128"  has a heat sink and a blast relay that yours may not have and could be added.  An external transistor model has been available in the past for higher power needs.

 

I know the coast/choke system is used in HO, but I am not familiar with that circuit.  It should be able to be added to this or any controller as Difalco does to his controllers for HO.

 

Generally, a choke can be an accessory between the track and controller clips.


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#4 mark

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Posted 08 February 2019 - 02:50 PM

Thank you both for your answers. Yea I also thought that the motor was probably the reason for the controller to heat up. It only happens with poly mod & unlimited cars.I did get the fan installed last night & it works,but haven't been able to test the controller heat under race conditions yet. I also have a blast relay that i have yet to hook up It also has the aluminum plate heat sink installed.Jim Difalco, do you still make a conversion kit for the parma turbo in HO scale? Also Larry I will be having some questions for you about the parma omni cidex. I recently purchased 2 of the HO versions,although I haven't received them yet. One looks to have a 12 position rotary switch instead of the sensitivity toggle switch. The other one appears to have a sliding switch instead of the toggle switch. Both have 8 diodes instead of 6 like used in 1'24 scale. I used a omni cidex back in the mid 90's & so far it was the best controller for my driving style.


Mark Heckman

#5 bradblohm

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Posted 08 February 2019 - 05:09 PM

Hello Mark, sorry for the delay in responding from PM.  Jim nailed it better than I could have explained, and you just mentioned one thing that can help (a little).  Adding the bypass relay will allow the transistor that little extra time to "breathe" when under full throttle.  We did this for a customer in TX who was running Super 16s, and towards the middle/end of races his controller would work erratically.  That is the self-resetting circuit breakers trying to protect the transistor.  Anyway, after adding that bypass he was able to finish races and was able to get on the podium for the first time.  All I could say was to not go "hotter" in motors.

 

PM controllers are great for low and mid-rage (and I know that means different things to different people!), but for really hot setups that draw lots of current, you should look at the Difalcos, Third Eyes, or Ruddocks.


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Brad Blohm


#6 Jim Difalco

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Posted 08 February 2019 - 08:25 PM

Mark, I do not have a conversion kit for HO scale. As long as your full power contacts are touching on your PM controller the relay will not help the transistor get a rest any better than the controllers power contacts. Fast cars on tight tracks just means you are on the bands much more of the time. You do not have the long straights, like in 1/24 scale, to let the transistor rest. While the PM controller has an aluminum plate for heat it does not have fins like a heatsink. I now use one transistor for power and a separate independent transistor just for coast. This splits the heat production so one transistor can rest while the other is working.

 

Larry, the coast switch just changes the brake rheostat into another sensitivity rheostat and is used to put a small amount of power into the transistor to overcome strong HO traction magnets. I activate mine with the dead band on the wiper board.


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Jim Difalco
Difalco Design
3075 NE Loquat Lane
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#7 bbr

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Posted 08 February 2019 - 09:40 PM

side note.

hate the coast, never use it, never had it on my HO controllers, even in unlimited racing.

always considered the coast as a remedy for a poorly set up HO car that drag the magnets, LOL, but some guys love the coast .

but I've never like the snake pit tracks where coast is most useful, LOL.

 

when racing high end cars i.e. unlimited... you gonna need a high end controller                                                           l


Mike Low
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Give me enough rope and I'll build a fast car... or hang myself?

#8 Jim Difalco

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Posted 09 February 2019 - 08:28 AM

Mike, your DD281 via Chicagoland is on the way to you.


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Jim Difalco
Difalco Design
3075 NE Loquat Lane
Jensen Beach, FL 34957
(772) 334-1987
askjim@difalcoonline.com


#9 bbr

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Posted 09 February 2019 - 09:28 AM

thanks Jim!!!

I have one of your controllers with the wire choke box on it, love the design


Mike Low
Cry like a baby, drive like a girl, walk like a man.
Give me enough rope and I'll build a fast car... or hang myself?





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