Fixing Back EMF problems

Fixing Back EMF problems - Episode 29

Рет қаралды 1,838

Күн бұрын

This video looks at the problem of Back EMF and the problems it can cause if not suppressed.
We look at what causes it, What problems it causes and how to fix it.
A few cents can save you a lot of problems later on.

Пікірлер: 20

@michaelkeymont501 2 жыл бұрын

Also known as a “snubber” diode. Make no mistake, back EMF also affects MOSFETs and transistor circuits. I used to be a failure analysis engineer for a SMPS company, and one of the issues that we saw a lot of was that the small transformers that they used would heat up and the glue that held the 2 sides together would fail. As the glue failed, the air gap inside the transformer got bigger and bigger, which changed its characteristics over time, resulting in HUGE back EMF spikes that would eventually wipe out the circuitry that fed the transformer. EXTREME heat and eventually a complete meltdown, literally, of the circuit was the result. Snubber diodes can only take so much abuse before they fail, so we worked on tracking that issue down for a good amount of time before realizing that the root cause was bad glue in the transformer. Picking a suitable diode to use can be tricky because you want to use one that can handle the amount of current that is SUPPOSED to be flowing in the circuit without heating up. If you pick one that can handle far too much current for the task, you risk the diode surviving at the expense of other parts of the circuit that it is meant to protect.

@rosswoolley2854 2 жыл бұрын

First view was a laugh, getting zapped, keep it up!

@cncnutzmassoedition9131 2 жыл бұрын

Thanks Ross

@ikecobey6268 2 жыл бұрын

Thanks Peter I was a victim of this IMF and damaged my masso e-stop... thanks again cheers

@cncnutzmassoedition9131 2 жыл бұрын

Thanks You can probably better understand why it happened now and won't get caught again. Cheers Peter

@testyourdesign233 2 жыл бұрын

Thanks for the information. Almost got a full set of how too videos now.

@cncnutzmassoedition9131 2 жыл бұрын

Thanks Stephen Getting there slowly but I have to redo some as things have changed.

@IceCreams62 Жыл бұрын

Hi. An 1N4006 or 1N4007 is right for this purpose ?

@roberttrains 2 жыл бұрын

was about to install a soloed to my Masso this week great timing... got a Different Question the Custom button )blank button on Masso f2 screen is that user configurable or does Masso need to modify it for you.

@cncnutzmassoedition9131 2 жыл бұрын

Hi roverttrains There is no blank button on the F2 screen. You will see in the documentation that the blank button you are referring too is where you enter spindle speed. Cheers Peter

@michaelorlik3dwaldhessen318 Жыл бұрын

Think this protection was build in the masso relay Module?

@cncnutzmassoedition9131 Жыл бұрын

It is not possible to add protection to the relay contacts on any relay interface module. If diodes are added to the module at manufacture you will be limited to switching DC only and the relay contacts would become polarity conscious. You will also find you can't use them for a lot of applications. It just isn't practical. Cheers Peter

@vstolpner 2 жыл бұрын

Can you use a simple LED instead? That would also give an indicator as to when the solenoid is switched

@cncnutzmassoedition9131 2 жыл бұрын

No. An LED will not handle the voltage or current. Cheers Peter

@vstolpner 2 жыл бұрын

@@cncnutzmassoedition9131 thanks, appreciate the response!

@harisabdullah576 2 жыл бұрын

Can you give a advise on Monitor flicker and usb disconnect issue. It would be great full, waiting for your reply

@cncnutzmassoedition9131 2 жыл бұрын

Hi Haris You would have to provide full details of the problem and your setup. I would suggest posting on the forum with as much information as you can provide. cheers Peter

@michaelkeymont501 2 жыл бұрын

Lol, I had to get a heavy duty VGA cable for my setup. The monitor went haywire whenever the motor was running. Lots of streaking/smearing etc. you can also add ferrite cores around the cable, including the monitor cable AND the power cable for your monitor. Also, be careful with how you route your cables etc.

@lektor6910 Жыл бұрын

This video would be much better if you would have shown less of yourself and the stockpics but rather explain it in a circuit diagram with your Oszi pictures. But thanks for your time. 🙏