Manual control of MC-2100 treadmill motor controller?

[murph64]

There are oodles of "how tos" on adding manual speed control to an MC-60 motor controller board. I'm trying to find something similar on the MC2100 -

http://ww2.justanswer.com/uploads/IR...14_MC-2100.pdf

but nothing turns up. The treadmill I "re-purposed" gave me both the motor and 2100 controller, and I'd like to use the 2100 if it's not too tough to mod for someone like me who has not much electronics knowledge. It's going on my REAL low tech South Bend 9C if it matters.


Thanks,
Andy

[Al_The_Man]

It looks like you need a PWM circuit for manual control?
A simple set up with a 555 timer should work, if you want to put one together yourself,
Google 555 timer PWM should get you all you need?
If you are using Mach, you may be able to use the PWM output to control the spindle by M3 and S value.
Al.

[murph64]

Will I get booted from here if I admit to this being used for <gasp> manual motor speed control?

Hope not Because that's where it'll end up, either on the lathe or drill press.



Andy

[Al_The_Man]

The 555 circuit with a pot should give you the Man. control you want.
DPRG: A Simple PWM Circuit Based on the 555 Timer
Except you don't need the whole circuit or anything after pin 7.
I don't know of anything off the shelf.
Al.

[Al_The_Man]

Here is one that may do the trick.
K8004: VELLEMAN INC.: Education & Hobby
You would need to eliminate the power section components and just use the output of the IC.
Al.

[murph64]

I know this circuit needs to go between the green and blue wires of connector H2 -

GREEN- This wire brings the speed sensor signal to the console. This is a pulsing 0, 5 VDC signal as the treadmill is
running. When the treadmill is at rest, this voltage may measure either 0 VDC or 5 VDC.
BLUE- This wire carries the square wave speed control signal from the console to the power board. The duty cycle of
this 5 VDC signal is used to set the speed of the treadmill. At the maximum duty cycle of 85% (meaning the 5 VDC
is being sent 85% of the time and not being sent 15% of the time), approximately 4 VDC can be measured. At lower
speeds, a lower voltage will be measured.

NOTE: Many digital multimeters have difficulty measuring this square
wave signal. They may only show a maximum of 1.5 VDC when the treadmill is set to its maximum speed. What is

important to see in this instance is that the voltage goes up as the treadmill speed is increased.

The way I have read into this is to connect pin 2 of the 555 chip to the blue wire? That should fool the 2100 into thinking the treadmill belt is running, right? That would get the motor to spin, but at a set RPM. Then the question on how to vary the speed of the motor.

Is it cost/time effective for me to tinker with the, or should I pick up a MC60 for $60 and be done with it?


Another question or option - I have a couple of 24vdc 3A computer power supplies. Could I daisy chain 4 of them together to get 96v, then use something to vary the output voltage to control the speed of the motor?


Thanks
Andy

[Al_The_Man]

I wouldn't bother PC with power supplies.
If you are not Electronically inclined, you may be better off to pick up one of the KB or Baldor DC motor controllers off ebay, if you shop you can get real deals, these are mains fed SCR drives so they do not need a power supply.
What is the size of your motor?
Al.

[murph64]

Damm camera is crapping out so I can;t get a pic of the dataplate. It's a permanant magnet "treadmill duty 2.65hp 130vdc", "cont duty 1.5hp 90vdc. Neither p/n on it (G-190528 or N-1CPM 138T) comes up with a cross reference, but "Proform 545" returns a bunch.

I know about the KB drives, but would rather not spend the $100 +/- for it.

Thanks,
Andy

[Al_The_Man]

I notice the MC-2100 board also mentions a tach feed back, if your motor does not have one, it could be a problem using this controller?
Al.

[Vectorges]

I got here because I have the same board/motor that I want to use in a lathe also. Wouldn't it be possible to use the part of the console that supplies the PWM signal to control the speed. I haven't looked closely at the console, I was trying to use just the controller board, but I will go after that tomorrow.

[dan4307]

Hi all. New to the forum and am not an electronics expert. I found the info on this thread very helpful in working through a solution for using the MC-2100 controller board with a treadmill motor. The only thing missing from what I can tell was the need to set a static frequency of the modulated square wave being sent by the 555 timer. Attached is the circuit I used to finally get by Mc-2100 controller board working without the original treadmill console.

I used a 556 dual-timer. The first half of the timer circuit set the frequency. You can tell you have success when the MC-2100 controller board begins to flash. My understanding is that the board will not recognize the signal until the frequency is set correctly. So if the LED is not flashing, the controller is not going to work.

the second half of the dual timer modulates the duty cycle or width of the pulse (as shown earlier in this thread).

Again - I would not even classify myself as a strong electronic hobbyist. So I welcome any modifications, corrections, or suggestions.

I just wanted to share what worked for me.

[mqpgroup]

Hi Dan,

I'm trying to reproduce the circuit to provided above using the same control board. I don't have the 8 pin wiring harness, however, so I can't interpret the color-coded instructions. Could you please list the order the the wire colors from top to bottom if you have this information available? Thanks.