Electrical Interference

[kstrauss]

I have recently added a pneumatic valve to control mist coolant. Now my monitor often momentarily blanks when turning coolant off and very occasionally my VistaCNC pendant resets. That sounds like perfect symptoms to install a Tormach "33059 - Electrical Noise Suppression Kit". I am in Canada so delivery won't be for a week or more. From the description and picture on the Tormach site it is simply a RC snubber. Is that all there is to it? If I'm right a 0.1mfd capacitor in series with a 100ohm resistor should do the trick...

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[Al_The_Man]

Yes, a RC snubber usually does the trick, assuming it is a AC solenoid, if it were DC, a 1N4007 rectifier would do it.
Al.

[kstrauss]

Yes it is an AC solenoid. I just tried to checkout my order on the Tormach site and the cost for shipping to Canada is more than for their charge for 3 snubbers!

[Al_The_Man]

Yes they are easy to make, ensure it is connected as close to the solenoid as possible.
Al.

[Al_The_Man]

Yes they are easy to make, ensure it is connected as close to the solenoid as possible.
Al.

[kstrauss]

Surely I can find a local source. I noticed that you are in Canada. I'm about 60 miles east of Toronto and you?

[mountaindew]

Hey guys
How do you install these?
I just installed a fog buster with ac solenoid control. I don't have a noise problem at this point but I do want to expand.
A control for a vacuum pump and shop vac will be in my future. Expecting these to be a problem from what I read anyway.
I see simple ferrite chokes on everything around here and that's about my experience with electrical noise .
md.

[Al_The_Man]

Surely I can find a local source. I noticed that you are in Canada. I'm about 60 miles east of Toronto and you?

About 2000Km west of you!
You can try the Electrical suppliers or wholesalers in your area, Electro-cube are a popular make.

Hey guys
How do you install these?
.

You connect them across the power in terminals as close as possible to the solenoid coil or device to be suppressed such as contactor coil etc.
Al.

[kstrauss]

Some time ago I complained about interference with my pendant when the mist coolant valve turned off. I added a MOV (Metal Oxide Varistor) across the solenoid which reduced the frequency of the problem but didn't eliminate it. I then installed the Tormach "33059 - Electrical Noise Suppression Kit". At $39 the kit seemed expensive but came with easy to follow installation instructions. One of the suppressors came with male-female connectors on its leads so that no wires needed to be cut to install it.

The good news is that I've had no further issues with my pendant!

[bevinp]

Yes they are easy to make, ensure it is connected as close to the solenoid as possible.
Al.

Al,
Yes the snubbers are easy to construct but the trick is getting the correct values of R and C. Here is a good intro into what issues are involved:
http://www.cde.com/tech/design.pdf
I guess that one could just try to cap the voltage spike to a minimum, but my reading of the referenced link suggests more accuracy of the switching layout is needed to design an effective filter. What is your technique? I am not being smart arsed... I really would like to know any shortcut given the usual voltages and switching encountered in this problem.
Bevin.

Good luck.

[Al_The_Man]

In many cases I will pick up the manufacturers product, it usually made to fit the solenoid or contactor with minimum wiring.
I have not found it to be all that necessary to be precise.
Here is a couple more references.
Al.