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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