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Marvin Kaye <marv@lancaironline.net> wrote:
... so he purchased one of Bob Nuckoll's crowbar modules and had it sitting unused. When installing the ground power system I decided to incorporate the crowbar circuit to protect us against the possibility of a line guy accidentally hooking up a 24V GPU and blowing things up.
Indeed, the contactor method does have the additional advantage of using lower current components for the crowbar circuitry, since it only has to short out the low-draw contactor coil. I like that. I'd like it even better if the contactor was a stepping relay and the crowbar actuated the stepper to the "off" position. Regards,
Dale R.
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