RE: [CAD_CAM_EDM_DRO] All Windings Off setting, Camtronics 5A boards

Tom:

If you're looking for safety, then you should remove the power source from
the motors themselves. With the Camtronics 2 amp boards, I'd put the switch
in series with the power supply connection to power input pin of the L298's.
With the 5 amp boards, I'd do the equivalent.

The general rule is that, in an emergency situation, you can't assume that
any of the electronics are working so you should hard-wire your power cutoff
right to the devices that potentially could cause damage. Once that's taken
care of, you can wire an additional contact off of the E-Stop switch to let
the computer know that a "stop" condition has occurred, and you might also
want to wire a line to the "inhibit" input of the controller.

The E-Stop should be wired such that "resetting" the E-Stop switch does not
automatically re-energize the motors. An additional "start" switch should do
that.

-- Jerry

| -----Original Message-----
| From: Kay, Tom [mailto:tom.kay@...]
| Sent: Friday, August 24, 2001 9:42 AM
| To: 'CAD_CAM_EDM_DRO@yahoogroups.com'
| Subject: [CAD_CAM_EDM_DRO] All Windings Off setting, Camtronics 5A
| boards
|
|
| Hello
|
| I was just curious about the best way to use this feature. Is this
| where you hook up an emergency "kill" button for safety? Does this do like
| it says and remove all current to the stepper motors?
|
| Anyone hooked up this feature before? As you can guess, I am very
| new to the cnc hardware, and I have built Dan Mauch's 3 axis, 5
| amp boards,
| but only bench tested the voltage readings. I haven't actually
| hooked up any
| stepper mototrs yet.
|
| Thanks for any help about the AWO pins.
|
| Tom.
|
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