Hey hey let's do a treadmill motor thread!

[RJSakowski]

Many years ago, I designed a PWM controller for a DC motor, using MOSFET transistors for the output. It was designed for a 12 volt trolling motor system system but the current capability was around 50 amps. It has served me well for more than 30 years, requiring only a replacement of the control potentiometer and of the MOSFET's when I accidentally reversed the power supply voltage once.

It could easily be modified to handle much higher voltages by simply choosing different MOSFET transistors. It was drawn up on paper (no computer back then) but I should still have the schematic around somewhere.

 

[Glenn Brooks]

Shawn,

Here are some pics of the treadmill controller schematic and model number. This works very well so far. The guy I bought it from said the controller and generic RPM meter, with potentiometer are readily available on line. The controller is a KBIC Model 125.

 

[Hukshawn]

I just bought a kbcc 125 on eBay. I'll need help figuring out how to wire it up.

What is this plug in horse power resistor I keep reading about?

 

[Hukshawn]

Here's what I bought.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/132253305166

Has a nice screw terminal setup.

On the kbcc 125...
What's the inhabit switch? Would that be a run/stop? How quickly does it stop?

What's the ramp up/down speeds like?

The horse power resistor, I see it now on the board. Glenn, on the other side of that sheet you pictured, it looks like it lists the horsepower resistors. Can you picture that? So I know what my board is rated for.

 

[Z2V]

Here’s a link to the different plug in resistors. Different value depending on motor hp rating.

http://www.walkerindustrial.com/KB-Electronics-Plug-In-Horsepower-Resistor-s/845.htm

 

[Hukshawn]

Here’s a link to the different plug in resistors. Different value depending on motor hp rating.

http://www.walkerindustrial.com/KB-Electronics-Plug-In-Horsepower-Resistor-s/845.htm

So I see they only have resistors up to 1 1/2 ho @90v. My motor is 2.5 HP. Will that overload the board or is it just lost horsepower? Which really would be fine, actually. It doesn't need that much power.

 

[Z2V]

I’m not familiar with this controller but it looks like an auxiliary heat sink is required for 1.5 hp use. Hopefully your controller will have it. It also looks like there is an aux armature fuse. The chart for the arm fuse list a 15 amp fuse for 1.5 hp motor. If it were mine I would use that size fuse. It looks like your motor was rated at 20 amps.
Here’s the manual for that controller I believe .
Hope this helps

https://www.kbelectronics.com/manuals/kbic_manual.pdf

 

[Hukshawn]

My model is kbcc-125 not kbic. But I found my exact manual on the website. For once, a website that’s easy to find exact manuals. This control board seems like a dream come true! I NEVER find exactly what I’m looking for to make something work. Never happens! This is gonna be great!

 

[Z2V]

Sorry for giving you a wrong link.
I didn’t look but does the kbcc125 support your 2.5 hp?
Glad you found what you need.

 

[Hukshawn]

No worries. I didn't notice at first either.
This kbcc goes up to 1.5 HP. My motor is 2.5.
I HIGHLY doubt I will ever turn anything that will require that amount of toque.
But more importantly, can I assume that extra hp will just be lost? The board will only push what it's rated for and not burn out? Or will the motor ask more than the board can offer?