To all, Some of this topic is covered in this month's Digital Machinist magazine, if you're interested. Cheers! James
----- Original Message ----- From: Jon Elson <[email protected]> To: [email protected] <[email protected]>; Enhanced Machine Controller (EMC) <[email protected]> Sent: Fri Nov 11 16:49:51 2011 Subject: Re: [Emc-users] A question re F2 David Bagby wrote: > Hi, > > While reading the EMC2 documents, I think I may have missed a > concept... I'm wondering about the intended purpose for F2. > > The docs talk about F2 "toggling the machine power". > The usage steps are always F1 (toggle estop) and then F2 (toggle power) > - and if one just follows the recipe of F1, F2 things work... > Yes, the names of these states is confusing, and most other controls have only two states instead of three. So, there is E-stop, E-stop reset and machine on. In E-stop, everything hazardous is disabled. In E-stop reset, the servo amps might be enabled, but the PID logic will send zero to the servo amps. Only in machine on will the machine move, hold position, etc. Now, one of the problems with the above approach is it allows the servo amps to drift due to small offsets in the amps if left in the in-between state of E-stop reset. So, it is better to set up the servo amps to only be enabled when in machine on. This makes it hard to set the velocity zero on the servo amps, but some rigging of relays allows you to do that. Jon ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users This communication is for the use of the intended recipient only. It may contain information that is privileged and confidential. If you are not the intended recipient of this communication, the disclosure, copying, distribution or use hereof is prohibited. If you have received this communication in error, please advise me by return e-mail or by telephone and then delete it immediately.
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