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Author Topic: Capacitor on Limit Switch  (Read 4937 times)

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Offline kolias

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Capacitor on Limit Switch
« on: January 28, 2011, 12:50:07 AM »
I’m in the final steps of wiring my new CNC and I have a question:

About 1.5 years ago I had a problem on my 1st CNC with the Z axis plunging uncontrolled and Hood had suggested installing a 0.1uF ceramic capacitor on the limit switch I had installed on the Z.

This capacitor fixed the problem and now on my new CNC I wonder; is it a good practice to install one of this capacitor in all of my Limit / Home switches, as per attached schematic, or it is better to wait to see if I have any problems?

Thank you
Nicolas
Re: Capacitor on Limit Switch
« Reply #1 on: January 28, 2011, 01:04:26 AM »
Yes, you better connect a 0.1uF between input and ground, it will filter any small voltage variation or noise pick up by the wire and use shielded cable.


Jeff


Offline kolias

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Re: Capacitor on Limit Switch
« Reply #2 on: January 28, 2011, 06:25:03 PM »
Not lucky lately..... I have 3 capacitors left from last time and each is 104 0.1uF. So I went to the store BUT they dont have these any more and the give me one which with my magnifying glass I can see 102, 003, RAV, C5K (102 is clear but the other ones may not be correct - very fuzzy).

I also received my 36V, 9.7A power supply unit from China today and I'm ready to adjust what needs to be adjusted and connect the motors to the control station and....we will see what happens next.

My question: is it ok to use this 102 capacitor in one axis and use the other three 104 on the remaining axes?

Or just leave one axis without capacitor?

Thanks
Nicolas

Offline Tweakie.CNC

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Re: Capacitor on Limit Switch
« Reply #3 on: January 29, 2011, 03:13:08 AM »
There is some information on the capacitor code markings here http://www.csgnetwork.com/capcodeinfo.html

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline kolias

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Re: Capacitor on Limit Switch
« Reply #4 on: January 29, 2011, 06:45:47 AM »
There is some information on the capacitor code markings here http://www.csgnetwork.com/capcodeinfo.html

Tweakie.

That is cool Tweakie but still dont know if I can mix capacitor size or if the 102 value is good or not
Nicolas

Offline Tweakie.CNC

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Re: Capacitor on Limit Switch
« Reply #5 on: January 29, 2011, 07:09:56 AM »
Basically the 102 (0.001uF) will not have the desired effect so don't bother with it.
Best get some of the 104 (0.1uF) like you used before.  ;)

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline kolias

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Re: Capacitor on Limit Switch
« Reply #6 on: January 29, 2011, 07:16:40 AM »
I will do that, thanks
Nicolas