FAQ: What energizes (closes) and de-energizes (reopens) the "estop" relay in LEGEND-MC (SMC-3010)?
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The relay is the LEGEND-MC's dry contact output located on pins 25 and 50 of the 5CN port.
The following will de-energize (open) the relay:
1) The axis has a position error greater than the error limit. The error limit is set by using the command ER.
2) The reset line on the controller is held low or is being affected by noise.
3) There is a failure in the controller and the processor is resetting itself.
4) There is a failure in the output IC which drives the error signal.
Note that the most common cause of the relay operating is the following error.
Based on the conditions above, the relay will reclose:
1) The servo gets back into position so the position error is less than that set in the ER command.
2) The reset input is changed from low to high (disconnected.)
3) Processor reset is complete.
4) No recovery from this condition.
Finally, it is not possible to program the EStop relay to open.
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