Re: [CAD_CAM_EDM_DRO] Sherline Retrofit Wiring Info Needed.

In a message dated 7/25/00 8:01:44 AM Mountain Daylight Time,
ejayhire@... writes:

<< The e-stop button should be red, on a
yellow base. Your software must be configured to watch the e-stop circuit
and turn everything off if it opens. Mine is E-stop is wired to the enable
pin of the stepper motor controller. >>

To be a true E-STOP it should also remove all incoming power to the entire
circuit, otherwise a shorted devices in the outputs can lock the steppers in
a run condition beyond the control of the circuits, and then could only be
stopped by pulling the plug. Use one set of switches on the e-stop to open
incoming power, use a stop button for all other functions, they are two
different devices, and used differently. The E-Stop button should be a
locking type so that it stays locked off when it is shut off.
The problem with solid state devices is that a high percentage of there
failures are in a shorted mode, and they can no longer be controlled, thus
you need a true E-STOP circuit to remove incoming power.
bill