I was running on my treadmill last week and mid-run, the treadmill started humming loudly and dropped speed quickly.

I hit stop, then I unplugged the treadmill for a few minutes to see if anything would discharge and reset. This didn't change the condition. I disconnected the motor and checked the resistance, 0.6 ohms.
I checked the voltage across the motor leads while running, 1mph is about 12v, 2mph is 30v, 3mph is 46v.
The motor spins, but is slower than normal and still makes a loud humming noise.

I hooked the motor directly to my Craftsman V20 tool battery with a pair of test leads. Motor is smooth as glass when supplied 20v DC from the battery.

I found a "new" board on eBay listed as MC2100LC-30. I installed the board today with some success.
The motor runs quietly now, but the speed control is not smooth. It looks like the board isn't controlling the load correctly. When I step on the threadmill at lets say 3mph, the belt will hunt and the speed will start to vary widely. Motor is smooth other than the overshoot/undershoot hunting.

Any advice on repairing the original board, or getting this new board to work?
I did notice that the new board has two dials. Not sure if this board requires configuration depending on the application.
Any advice is welcome. I'm not a hardware guy, but I am an old mechanical engineer that likes to tinker with electronics.

Thanks in advance.

Photos attached.

 

The old board requires a 20hz PWM signal into HD2 pins 1 & 4 for bench testing.
It could be the track sensor pot needs adjusting when using on the TM.
.

 

Thanks Max! I was hoping you would see this. Seems that you are the MC2100 expert.

Is there any reason that the new board wouldn’t be plug and play? Do I need to set anything with the two yellow pots that are on the new board?

 

Looks like one of the newer boards, one pot is most likely belt speed setting , note position and give it a try !.

 

Max, that was it! Looks like one dial is for speed calibration. The other dial looks like some type of “gain” control. I bummed up the “gain” dial until the belt was smooth.
Runs perfect now!
Hopefully this helps someone else in the future too.

 

La semana pasada estaba corriendo en mi cinta y, a mitad de la carrera, la cinta comenzó a zumbar ruidosamente y perdió velocidad rápidamente.

Apagué la cinta y la desconecté unos minutos para ver si se descargaba y se reiniciaba. Esto no cambió el estado. Desconecté el motor y comprobé la resistencia: 0,6 ohmios.
Verifiqué el voltaje en los cables del motor mientras estaba en funcionamiento: 1 mph son aproximadamente 12 V, 2 mph son 30 V y 3 mph son 46 V.
El motor gira, pero más lento de lo normal y todavía produce un fuerte zumbido.

Conecté el motor directamente a la batería de mi herramienta Craftsman V20 con un par de cables de prueba. El motor funciona con una suavidad excepcional cuando se alimenta con 20 V CC desde la batería.

Encontré una placa "nueva" en eBay, con el número MC2100LC-30. La instalé hoy con cierto éxito.
El motor ahora funciona silenciosamente, pero el control de velocidad no es fluido. Parece que la placa no controla la carga correctamente. Cuando uso la cinta de correr a, digamos, 5 km/h, la correa oscila y la velocidad empieza a variar mucho. El motor funciona fluido, salvo por la oscilación entre el exceso y el defecto.

¿Algún consejo sobre cómo reparar la placa original o hacer que esta nueva placa funcione?
Observé que la nueva placa tiene dos diales. No sé si esta placa requiere configuración según la aplicación.
Cualquier consejo es bienvenido. No soy experto en hardware, pero soy un ingeniero mecánico veterano al que le gusta trastear con la electrónica.

Gracias de antemano.

Fotos adjuntas.
[/CITA]
Hola que tal
Oie en las fotos adjuntas tienes alguna que se observé bien esto?

 

La semana pasada estaba corriendo en mi cinta y, a mitad de la carrera, la cinta comenzó a zumbar ruidosamente y perdió velocidad rápidamente.

Apagué la cinta y la desconecté unos minutos para ver si se descargaba y se reiniciaba. Esto no cambió el estado. Desconecté el motor y comprobé la resistencia: 0,6 ohmios.
Verifiqué el voltaje en los cables del motor mientras estaba en funcionamiento: 1 mph son aproximadamente 12 V, 2 mph son 30 V y 3 mph son 46 V.
El motor gira, pero más lento de lo normal y todavía produce un fuerte zumbido.

Conecté el motor directamente a la batería de mi herramienta Craftsman V20 con un par de cables de prueba. El motor funciona con una suavidad excepcional cuando se alimenta con 20 V CC desde la batería.

Encontré una placa "nueva" en eBay, con el número MC2100LC-30. La instalé hoy con cierto éxito.
El motor ahora funciona silenciosamente, pero el control de velocidad no es fluido. Parece que la placa no controla la carga correctamente. Cuando uso la cinta de correr a, digamos, 5 km/h, la correa oscila y la velocidad empieza a variar mucho. El motor funciona fluido, salvo por la oscilación entre el exceso y el defecto.

¿Algún consejo sobre cómo reparar la placa original o hacer que esta nueva placa funcione?
Observé que la nueva placa tiene dos diales. No sé si esta placa requiere configuración según la aplicación.
Cualquier consejo es bienvenido. No soy experto en hardware, pero soy un ingeniero mecánico veterano al que le gusta trastear con la electrónica.

Gracias de antemano.

Fotos adjuntas.
[/CITA]
Ayuda por favor
Que tal matamoscas
Tendrás el frente de esta imagen?

 

Last week I was running on my treadmill, and halfway through the run, the treadmill started humming loudly and quickly lost speed.

I turned off the treadmill and unplugged it for a few minutes to see if it would discharge and restart. This didn't change the condition.
I unplugged the motor and checked the resistance: 0.6 ohms.
I checked the voltage on the motor wires while it was running: 1 mph is approximately 12 V, 2 mph is 30 V, and 3 mph is 46 V.
The motor is spinning, but slower than normal and still produces a loud humming noise.

I connected the motor directly to the battery of my Craftsman V20 tool using a pair of test leads.
The motor runs exceptionally smoothly when powered by 20V DC from the battery.

I found a "new" board on eBay, number MC2100LC-30. I installed it today with some success.
The motor now runs quietly, but the speed control is not smooth. It seems the board doesn't handle the load properly.
When I use the treadmill at, say, 5 km/h (3 mph), the belt wobbles and the speed starts to vary wildly. The motor runs smoothly,
except for the oscillation between overshoot and undershoot.

Any advice on how to repair the original board or get this new board working?
I noticed the new board has two dials. I don't know if this board requires configuration depending on the application.
Any advice is welcome. I'm not a hardware expert, but I am a veteran mechanical engineer who likes to tinker with electronics.

Did you try the speed pot or feedback pot on the board?
See post #5

 

Hello everyone, maybe my question is a bit off-topic, but I just can’t help asking it: Why was the discussion about the old versions of the MC2100 boards closed?
https://forum.allaboutcircuits.com/threads/mc2100-treadmill-motor-control-circuit.100678/page-20

One rehabilitation center reached out to me asking for help to repair a treadmill weslo cadence s5 (uses 220 volt) and board - MC2100E REV C ICON 2003 turn out most likely due to a dead microcontroller, since it doesn’t respond to the 20 Hz signals he applied to the pin 13 and the LED doesn’t blink as it should if there were errors. All the components on the board are fine. I desoldered each one and tested it separately, but that turned out to be a pointless exercise.

Still, I made a reverse-engineered diagram of this board, and I’d like to share it. I may have made some mistakes, and if so, please don’t judge me too harshly.


And I also want to ask a question to the forum users:
Maybe someone has managed to make an alternative replacement with suitable firmware, for example by using Arduino boards or something similar, to bring this old board back to life?

I tried to do it myself, but I don’t have enough knowledge to write proper code to get this old dinosaur working.

I also thought about using a regular triac-based power regulator rated for 2–3 kW, similar to soft-start circuits used in vacuum cleaners (or just for collector motors), with adjustable power control. But of course, that would be a last resort, and it’s unlikely that such a solution would satisfy my client.

 

Hello everyone, maybe my question is a bit off-topic, but I just can’t help asking it: Why was the discussion about the old versions of the MC2100 boards closed?
https://forum.allaboutcircuits.com/threads/mc2100-treadmill-motor-control-circuit.100678/page-20

I would like to know also!!???

 

Maybe someone has managed to make an alternative replacement with suitable firmware, for example by using Arduino boards or something similar, to bring this old board back to life?

That might be an interesting future project !!
I will have to bookmark that for later attention..