On Tue, 11 Apr 2017, Valerio Bellizzomi wrote:
> Date: Tue, 11 Apr 2017 20:25:04 +0200
> From: Valerio Bellizzomi <vale...@selnet.org>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: EMC Users <emc-users@lists.sourceforge.net>
> Subject: [Emc-users] mesa setup
>
> Hello,
> I am looking at the 7i76 manual and at the TB2 connector pinout (page
> 5), it is evident where to connect the step and dir wires, it is less
> evident where to connect the enable+ and enable- wires for each motor
> driver.
>
> What is the usual setup ?
>
Normally Step drive "enable" pins are actually disable pins
so the drive functions normally without these being connected
In addition typically step drives are fairly safe in that unlike servo
drives, they will not move without step pulses
So its most common that these pins are just ignored
If they are actually enable pins (powered to enable drive),
they can be driven by a spare step/dir pin or 7I76 field output
If your enable pins are actually disable pins (and you must power them to
disable the drive), and you feel you need to disble them for things like
emergency stop, perhaps the best solution is to drive them with a normally
closed relay contact so the drives are disabled until the relay is energized
Peter Wallace
Mesa Electronics
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