Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: saab9395 on January 22, 2015, 01:16:27 PM

Title: LTP cable overheating problem
Post by: saab9395 on January 22, 2015, 01:16:27 PM

Hi all

so lately i have been doing some tests with mach3 and stepper motors and what i have found is the LTP cable which is connectning the PC and the mother board started to heat up.
Does anybody know why is it heating up and can you tell me how to fix that?

thanks

saab

Title: Re: LTP cable overheating problem
Post by: garyhlucas on January 22, 2015, 08:17:05 PM

You most likely have a ground loop because the sheild on the cable is connected at both ends. This also implies some device, possibly a motor is shorting to ground and the current is taking that path instead of the safety ground. Disconnecting the shield at one end may stop the heating. However it also could cause the PC or the machine to have a very unsafe voltage on them so proceed carefully!

Title: Re: LTP cable overheating problem
Post by: saab9395 on January 23, 2015, 01:21:51 AM

Hi

Thanks dude i will try to fix it and i will message you back.

Saab

Title: Re: LTP cable overheating problem
Post by: saab9395 on January 23, 2015, 07:14:57 AM

Hi

i was wondering when i was reading what do you mean by "shield".

saab

Title: Re: LTP cable overheating problem
Post by: RICH on January 23, 2015, 08:08:04 AM

Inside the outer covering is a braid of wire / metal foil / bare wire / both whatever and that is the shield.

RICH

Title: Re: LTP cable overheating problem
Post by: saab9395 on January 27, 2015, 12:37:53 PM

HI guys

i was testing it like you said but it still didnt work. The cable was still heating too much. Do you have any other ideas

thanks

saab