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

Hi Tom & Jerry, :>)

Good thread starting!

I've got my full set of Gecko's now, and the power supply hardware, and
some neat push buttons, E-switch, indicators, relays and contactors. I
haven't figured out yet what exactly the contactors are (SIEMENS
3Ft2010-0AC2) yet, but I'd like it include them in my new driver box.
Relays are easy enough to hook up to be latching, and drop out when a
limit sw or E-switch is pressed; I assume that the contactors can be
used similarly? I may just go for a "simpler" design to start, and add
the complexity later.

The Gecko 210's have disable input, which should be useful, but you're
saying it's better route the MOTOR power through a relay that will drop
out? Then I'll probably just wire the disable to a switch. I think all
I have is push buttons! Some thinking required here!

Alan KM6VV


Carol & Jerry Jankura wrote:

>
> 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.