What is the exact MC2100-? part No on your board?

 

This is number serial of my MC2100

 

And photos of board.
The resistor R24 is a 0,56 ohm 3w.

 

That a new one on me, there are so many versions of the MC2100's now!!

 

Hello,
Bad luck for me
I found the first hs resistor that I had changed for the first breakdown. It was indeed a 0.56 ohm but in 2w. For me, for it to burn, it must be shorted through the capacitor or through the transformer. What other reason could there be?
Thank you for your help

 

Hi all, I have an MC2100ELS-18W in a treadmill which was causing the breaker to trip as soon as the motor was set to run. From this thread I quickly diagnosed a suspected failed IGBT which was confirmed and replaced.

The treadmill now powers on and runs but the speed regulation is terrible, at lower speeds it will overshoot before settling down. At higher, it will just run fast. There seems to be no ability to load the motor.

From what I can see the only form of feedback is through the measurement of the current flow through the 0.01 ohm resistor R63 which is measuring correctly (at least in circuit)


I am told that before it was tripping the breaker straight away it would do it as soon as you stepped on so I'm assuming something else is amiss here.

Has anyone any pointers on what to check?

 

If the IGBT was blown, check the SCR that ramps up the DC.

 

I've just tested the SCR and it seemed OK, I replaced it anyway and it is still the same.

Video here shows setting the speed to 6 and it overshooting, settling down, then slowing under load (just 1 leg on it) before ramping up.

It's curious that the PWM percentage is going down after setting which suggests some closed loop control but it runs without the speed sensor connected.

 

The main board runs ok on the bench without the feedback sensor, this usually comes into the main board and goes up to the console for processing.
The bench test is usually the best way to test the main board.

 

Hello,
Bad luck for me
I found the first hs resistor that I had changed for the first breakdown. It was indeed a 0.56 ohm but in 2w. For me, for it to burn, it must be shorted through the capacitor or through the transformer. What other reason could there be?
Thank you for your help

Hi Famu - I have the same problem, I'm about to replace R24 with a 0.56 ohm 5W. Did you do more than replace? Successful? Thanks... Paul (Canada)

 

Hello! Maybe someone has a photo of the back of the board? My board caught fire and I can’t repair it.
MC2100E REV C ICON 2003

 

Pretty extensive damage, I don't recognize that version, but you would have to reverse engineer that part of the circuit as best as possible.

 

Pretty extensive damage, I don't recognize that version, but you would have to reverse engineer that part of the circuit as best as possible.

I photographed the entire board. Several elements have already been removed from the board for repair.
Sorry for bad English. Google Translate.

 

Hello,
Bad luck for me
I found the first hs resistor that I had changed for the first breakdown. It was indeed a 0.56 ohm but in 2w. For me, for it to burn, it must be shorted through the capacitor or through the transformer. What other reason could there be?
Thank you for your help

Hi Famu - I have the same problem, I'm about to replace R24 with a 0.56 ohm 5W. Did you do more than replace? Did this get the readmill going? Thanks... Paul (Canada)

 

Firstly, WOW, this thread has been going a long time. I have read from beginning to end... about here.
I have a MC2100LTS-50w Rev B board in a Nordic Track treadmill. The upper end is bricked so I decided to Arduino it. It was running great until about a week ago still with wires running everywhere out of the breadboard.
Brings us to now. If I attempt to speed up past 5mph, that's a 22ms pulse width, 50Hz frequency, it starts slowing down. If I lower the speed to that level again 450/1023 it starts to speed back up to the 5mph (aprox).
Any, and I mean ANY, suggestion would be appreciated.
If nothing comes, I want to say thank you anyway for all the input on this tread.

 

What does the LED show? Any change?
MC2100 is normally a 20Hz pulse?

 

What does the LED show? Any change?
MC2100 is normally a 20Hz pulse?

 

My bad. Freq is 20Hz (50ms). The LED goes from the normal rapid blink to a slow blink after 450/1023 (22ms pulse width) I'm still testing the whole thing but didn't change anything is software since it worked a week ago. But due to the bread board, something may have gone wrong. Looking at it on a scope, the pulse in is 5 volt but it reduces to 1.3 volts when hitting the optical f817.

 

The PWM_RPM file is how the pwm used to look. The other image is how it looks now tapped at the arduino and then after a 500 ohm resistor connected to the pin 4 (blue wire) to treadmill. It's almost like it's shorting out somewhere but even when I hook it up directly to the removed 817 it drops the voltage. A 200 ohm resistor has the same effect, the treadmill slowly slows down. If I skip the resistor, sending the 5 volt pulse directly to pin 4, it slows more rapidly. I just did a complete change out of arduino to see if that was the problem. I think the problem, is me. When the cold hits Manitoba, I sure hope this thing is running.

 

What is the voltage of your PWM signal and do you have the series resistor in circuit for the Opto input?