Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: kolias on August 24, 2012, 08:01:37 AM

Title: Capacitors
Post by: kolias on August 24, 2012, 08:01:37 AM

On the previous cnc I had, I used a Probotix BOB and Hood suggested to install a 0.1uF ceramic capacitor between the + and – where the wiring from the limit switches were connected.

I'm doing the wiring now for my new cnc and since I use the G540, is it necessary to install these capacitors on the wiring for the limits again?
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Nicolas

Title: Re: Capacitors
Post by: Hood on August 24, 2012, 09:25:02 AM

Try without, you only need to insatll caps if you have a noise issue and I cant recall anyon needing them with the G540.
Hood

Title: Re: Capacitors
Post by: budman68 on August 25, 2012, 07:54:22 AM

I can confirm Hood is correct in that I use the G540 on my Taig Lathe and do not need any caps on my limit switches.

Dave

Title: Re: Capacitors
Post by: kolias on August 27, 2012, 12:53:14 AM

Thank you both, I will try without the caps

Title: Re: Capacitors
Post by: Bob Braeking on August 27, 2012, 05:54:00 AM

Interesting.  I am having noise issues with my limits.  I do not want to let the smoke out of my BOB so please explain the wiring of the cap.

Title: Re: Capacitors
Post by: Hood on August 27, 2012, 06:56:35 AM

Much better to have your limit wires properly shielded and grounded if you dont already but if caps are needed then usually its a 0.1uF cap that is used and it connects between the input and a gnd pin/
Hood

Title: Re: Capacitors
Post by: budman68 on August 27, 2012, 09:33:39 AM

Agreed, just to be clear, I always use shielded cable on the home/limit switches.

Dave