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My 4-ohm Parma Turbo controller started to smoke


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#1 NY Nick

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Posted 17 March 2018 - 04:25 PM

It started to smoke only with Super 16 and above the track.

Don't know what the track power is, it is rebuilt with all new parts.

Any Help would be great


Nick Cerulli




#2 MSwiss

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Posted 17 March 2018 - 04:53 PM

Assuming it starts to smoke, after a certain time of use, it's probably because you are driving too much mid-range.

For a controller to run cool, with a hotter motor, you have to drive more on off, on off, because when the controller is full on or off, it gives the resistor a chance to cool down.
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Mike Swiss
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#3 NY Nick

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Posted 17 March 2018 - 07:37 PM

That is how I was driving, its the nut between the wheel and the seat.

The other car ran fine 16D low timing.

Thanks Mike


Nick Cerulli

#4 James Wendel

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Posted 17 March 2018 - 07:44 PM

For what it's worth, when I used resister controllers, I used a 3-ohm for Supers and 4-ohm for 16Ds.


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#5 Mike Patterson

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Posted 17 March 2018 - 07:53 PM

I'll second the recommendation for a 3 ohm resistor.


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#6 Joe Mig

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Posted 17 March 2018 - 09:13 PM

Is it old enough to smoke?
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#7 Brian Czeiner

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Posted 17 March 2018 - 09:57 PM

You may want to check that the brass trigger plate is actually making contact with the full throttle contact/stop and not relying on the wiper contact. Saw this happen many times with resistor controllers. Just my 2 cents.


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#8 Ramcatlarry

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Posted 17 March 2018 - 10:13 PM

I would not use any turbo with motors with armature wire bigger than #30.  No grp 12, 20, S16C or D, or any cobalt motor.  Too much trigger time in the mid-range of power.  The double barrel turbo is generally rated at only 35 Watt and the single at 25 Watt - or less than 3 amp draw under load.


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#9 NY Nick

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Posted 18 March 2018 - 06:25 AM

All helpful info.


Nick Cerulli

#10 slotcarone

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Posted 18 March 2018 - 06:37 AM

If you just rebuilt it then it could be the new parts getting hot for the first time but it really should only smell a little. If it works fine with a slower motor then most likely like others have already said it is just too hot a motor for a 4 ohm on that track.


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#11 Samiam

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Posted 18 March 2018 - 08:19 AM

Nick, 

 

If the wiper is new, it makes a small contact area with the resistor face. Use some fine sandpaper to flatten it some so more resistor bands are in contact. 


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#12 drrufo

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Posted 18 March 2018 - 10:52 AM

If you are going the sandpaper route, use a fine grit and put under the wiper. Make sure the paper is facing the wiper and move it back and forth a few times .The will mate the two parts and give you more contact area.

 

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#13 NY Nick

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Posted 18 March 2018 - 11:03 AM

I am going to do all these things again (sand paper and clean the contacts).

This Controller is for my nephew he sometimes goes with me to Buzzy's.

I will start him out with 16D motor cars.

Thanks again,  


Nick Cerulli

#14 airhead

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Posted 18 March 2018 - 01:49 PM

​Stop! holding the trigger in one position trying to go around the track, go wide open on the straights, brake for the turns with out stopping then ease the power back on. 

​ A parma 3 ohm  4 ohm  or even a 7 ohm controller should work well with a supper 16 

Parma sells a heat sink for that controller, but you shouldn't need one.


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#15 Samiam

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Posted 18 March 2018 - 08:07 PM

Uhhhh.....Nick is no newbie. He's pulled a few triggers in his time. 

 

Once he gets the wiper button sanded down with a larger contact area, it will be good to go.


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#16 MSwiss

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Posted 18 March 2018 - 08:21 PM

Sam,
I don't see how that will make the controller run cooler.

He already admitted he was driving the car too much partial throttle.

If he was on a low traction track, with a fast motor, it wouldn't be that odd of a thing.

Mike Swiss
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Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#17 Samiam

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Posted 18 March 2018 - 08:33 PM

He admitted no such thing. I spoke to him today in person. 

 

Now, the wiper button. When it is new, the contact area is very small due to the convex shape. Therefor only a very narrow band of resistor bands is carrying the current. When it is sanded down and the contact area is larger, it contacts more resistor bands, therefor spreading the current load over more bands and not heating up like a toaster. 

 

Been doing it this way since buying my first Parma over 45 years ago.


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#18 MSwiss

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Posted 18 March 2018 - 09:02 PM

That's not how a controller works, Sam.

When a button travels across the resistor face, the current only flows through the coil closest to the end of the resistor.

Mike Swiss
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#19 MSwiss

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Posted 18 March 2018 - 09:16 PM

20180318_212637-1.jpg

Mike Swiss
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#20 drrufo

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Posted 18 March 2018 - 10:46 PM

Having the controller full open or full closed will allow a transistor controller run cooler. The transistors are not involved when it is full open, due to a bypass. Or at least with my products.  That is from Dan Ruddock.

 

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#21 NY Nick

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Posted 19 March 2018 - 04:35 PM

I went to the track to test out the 4ohm controller with a 16D, S16D, and a old 12 wing car.

Could not get the 12 and the s16 car's to hook up on the king, controller started to smoke.

I Thank everyone for their input, 20 post you guys are the best.


Nick Cerulli

#22 Bazzie

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Posted 25 March 2018 - 01:17 PM

Actually Mike, Sam is right, at least a little! If the contact area is too small, the button only touches part of a wind, not the full width of the winding surface so all that current goes through a small point, generating more heat. Flattening it slightly ensures that the button face touches at least one winding over the full width of the winding flat surface


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#23 MSwiss

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Posted 25 March 2018 - 01:33 PM

Except that's not what he said.

He was implying that touching more bands at the same time would matter.

PS-the bands on a Parma 4 ohm controller are only about .032" wide.

You would have to intentionly modify the button to not contact the whole surface of the band.

IOW,you would have to work at making it "unsmooth".

Mike Swiss
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Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

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Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#24 Samiam

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Posted 25 March 2018 - 01:45 PM

When newbies were racing with their brand new controllers right out of the box, they would smoke and show signs of overheating. I would lend them my worked on 3ohm Turbo while I massaged theirs. Handed back a worked 'troller and no more problems. But I also would give them a 3 min. driving lesson so that helped too.


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#25 SpeedyNH

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Posted 25 March 2018 - 05:00 PM

what year was that?

just curious

speedy


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