Dynomotion

Group: DynoMotion Message: 9420 From: amitgoradia Date: 4/17/2014
Subject: Torch Height control using Mesanet's THCAD
Hi Tom,

Is it possible to use mesanet's (www.mesanet.com) THCAD voltage to frequency converter (A-D) for torch height control of a plasma cutter machine?

The manual for the THCAD Accessory is located at http://www.mesanet.com/pdf/analog/thcadman.pdf

It outputs a frequency of approximately 100kHz to 1 MHz vhich is proportional to the input torch voltage. This provides very high isolation.

I figured that we can use one of the encoders on any of the un-used axes (I am using only 3 axis on the plasma table) to measure the frequency and use it as a THC.

Let me know your thoughts.
Regards,

-amit
Group: DynoMotion Message: 9421 From: TK Date: 4/17/2014
Subject: Re: Torch Height control using Mesanet's THCAD
Hi Amit,

KFLOP's encoder inputs require quadrature signals. It looks like a circuit would be required to generate a phase shifted quadrature signal.  Then you could use the encoder input to measure the frequency over some period. 

Regards
TK

TK

On Apr 17, 2014, at 3:17 PM, <amitgoradia@...> wrote:

 

Hi Tom,


Is it possible to use mesanet's (www.mesanet.com) THCAD voltage to frequency converter (A-D) for torch height control of a plasma cutter machine?

The manual for the THCAD Accessory is located at http://www.mesanet.com/pdf/analog/thcadman.pdf

It outputs a frequency of approximately 100kHz to 1 MHz vhich is proportional to the input torch voltage. This provides very high isolation.

I figured that we can use one of the encoders on any of the un-used axes (I am using only 3 axis on the plasma table) to measure the frequency and use it as a THC.

Let me know your thoughts.
Regards,

-amit