Correction - The mill currently has encoders on the motors only.

Dave

----- Original Message ----- 
From: "Paul Keeton" <pkeet...@woh.rr.com>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Saturday, March 20, 2010 6:03 PM
Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC


> As I stated earlier -
>
>         The mill currently has encoders on the motors. The issue is 
> getting
> the Fanuc drives existing on the machine at this time to work with EMC. 
> The
> drive requires an analog reference command signal. The drive also requires
> an analog tach signal to operate correctly. It does a comparison between
> VREF and TSA (tach) to calculate both direction and speed and adjusts the
> drive operation accordingly. To my knowledge and based on the 
> documentation
> on this drive and motor it must operate in velocity mode. The encoder
> signal(A,A/,B,B/,Z,Z/) currently is fed to the Fanuc 11M control and is
> converted in the main control hardware to an analog signal that is sent to
> the drive. This model drive does not accept PWM signal for VREF or
> Quadrature for the tach. If you take the Fanuc control out of the picture
> and install an EMC based control the drive will still require the tach
> signal. The machine does not have scales, It does not have tachs, it does
> not have encoders. These items can be installed if/when needed
>
> Dave.
>
>
> ----- Original Message ----- 
> From: "Chris Radek" <ch...@timeguy.com>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Sent: Saturday, March 20, 2010 5:32 PM
> Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC
>
>
>> On Sat, Mar 20, 2010 at 02:07:14PM -0400, Paul Keeton wrote:
>>> Gene,
>>>
>>>             Do you (or anyone else) see any any issue with using a
>>> separate
>>> encoder and leaving the tach on the motor alone?
>>
>>
>> WAIT - what exactly do you have?
>>
>> Some people are assuming you have tachs, some assume you don't, some
>> assume you have linear scales, some don't, ...???
>>
>> Can you tell us clearly what is and isn't on your mill?
>>
>> Chris
>>
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>
>
>
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