### Network

Mar 8, 2023
9

Last edited:

#### Minder

Apr 24, 2015
3,366
I don't really have any knowledge of the MC5100 series, but I would surmise that LG1 is a GND connection, try metering it to LV common or the chassis.
As to the 12pin HD2 the PWM normally goes to a small value resistor then to a 4 pin opto, on the MC2100 it is pin 1 (Common) and pin 4, PWM in.
Pin 1 is the bottom pin nearest where LG1 is.
I don't have any idea what LG6 & 7 are?
There is a company (Helwig-Carbon) I have dealt with for brushes, but not sure what they would charge for a couple like that,
Some sort of reverse-engineering of some of the questionable items could probably answer them.
There is the schematic here on the site if you do a search for the MC2100 version, which may help in some of the areas, Most likely it is very similar in many ways.
If you have a motor choke, it is wise to use one if available.

Mar 8, 2023
9

#### Sirchawlez

Mar 8, 2023
9
I'll try the pins you mention for my pwm and let you know if it all works or not. 1 and 4 you said starting from the closest pin to the ground connection spots? Thanks again. And I'll definitely link maker.pro and your account name for credit if I make a video too if that is ok with you and is ok with the site. Sorry one last thing the motor choke, where would I put that into the circuit? Between the motor and the board ? Spliced/connected into the wires coming from the motor between the board/motor? I actually think the last pair of connections might be for the incline motor to connect to the board, does that sound right ?

Last edited:

#### Minder

Apr 24, 2015
3,366
For the PWM pin you should do a trace of the the pins and if like the MC2100, there should be a 4 pin Opto isolator that then goes to the processor.
On the MC2100 ver. the series resistor is quite small value, so most interfaces require an added series res the value depends on the voltage used by the controller.
Any motor choke should be wired between the motor and board, some are two wire, some 4 wire.
This is the 4 wire type.

#### Sirchawlez

Mar 8, 2023
9
Awesome thanks, and the choke I have is a 2 wire one, in regard to adding a resistor you say depends on the voltage of the controller, you mean the board right? Not the pwm? Or the pwm? And the pwm I have is 9v-60v 12amp 500watt, so if that is what you were referring to what size resistor would be adequate in your opinion? And is that something I could possibly find and remove/desolder from a different source/board and add? I just have several extra boards and multiple others from random electronics so if I can repurpose that would be ideal! One other question for you is the board I have in picture that is an endex dcmd77n, seems to be the most simple board out of the bunch I think? Would you mind telling me where the pwm would connect to on it? If it's the same as other board my apologies it just doesn't look the same overall the connections are in different places, I only ask because of the simplicity of the board but also because I have the choke wired into it already and also have switch/fuse in place for it AND this motor actually has it's brushes already, I'd much rather use the motor and board we have been discussing but I am missing the brushes for the motor currently so for the time being the motor is a paperweight until I get or find the missing brush for it. Should've mentioned that in original post I know! Sorry I wish I was more knowledgeable in regard to this kind of stuff but I am learning from you and only need to be told something once typically so it's all very helpful!

#### Minder

Apr 24, 2015
3,366
If it has the typical Opto PC817 etc, then the input diode has to be restricted to 50ma, so requires a total series resistance in order not to exceed this.
I am not familiar with the Endex board.
Most of the motors for the typical TM's will interchange motors.

#### Sirchawlez

Mar 8, 2023
9
I scrapped another treadmill today and finally got a mc2100 board In it thankfully so other boards/motors are in a time out for the moment. Thank you so very much for all the assistance though! Very much appreciated it and wish more people were willing to help others out these days! Everyone has sticks up their you know what and take it out on everyone and anyone.

#### Sirchawlez

Mar 8, 2023
9
Update, so finally got that mc2100 board and when hooking up the pwm control it doesnt light up at all, no options, tried making sure connections were all good but still won't work. But oddly enough the pwm flashes for a split second (lights up) and immediately goes dark when adjusting the one of 4 pins, don't know if that means anything but super frustrated that I cant get this board to work with the pwm controller, I have literally 3-4 motors and control boards from treadmills and cant manage to get any of the motors running (except when hooked directly to a battery, but that doesnt allow me any control over speed etc) so I know the motors work and boards should too, so does that most likely mean the pwm controller is a dud or underpowered? I thought I read somewhere that even if it was underpowered it would still run the motor but only at a fraction of what it should be powered at? So like 50% of what its rated for? If that's true then I dont get why I am not getting any spin on the motors at all? This is irritating as all heck since I know this should be such a simple project to get going but it's been issue after issue. Any help would be greatly appreciated! I am going to order--DC 10-55V MAX 60A PWM Motor Speed Controller CW CCW Reversible 12V 24V 36V here is the link https://www.ebay.com/itm/112632201224, by the time you reply I would have ordered it. I am HOPING that this will allow me to finally be able to run these motors I have with ease, and the nice addition of a forward and reverse switch would be nice too. Will this be adequate for running these motors most likely? Thanks again.

#### Minder

Apr 24, 2015
3,366
The only issue is that the unit voltage is too low, (36v) in order to control TM motors up to the rated RPM/Torque.
If you tried a PWM command signal on the MC2100 , is the PWM control signal limited to <50ma?
As the Input Opto won't take any more than this.
One symptom is a brief flash of the LED. It should be on steady when powered up, and have a steady regular flash

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