Quote Originally Posted by dachopper View Post
Ok, so by a master latching relay, how can I mechanize it? I assume your talking about the AC power that powers the motors, spindle, and coolant being physically cut by a relay, when e-stop or fault conditions are detected and staying latched, but how can I achieve this using fault signal - like you say without software?
Creating latching relay is easy you just route the coil power thru one of the NO contacts before connecting to the coil. This breaks the circuit until the Momentary reset button is pressed. This Momentary button goes between power and the coil so when pressed powers the Relay coil which close the NO contact allowing power to flow to the coil, relay then remains latched until something breaks the latch. That could be E-stop, limits or fault signal.

You then use any remaining Contacts on the relays to operate or send signals to things that need them. What you control or inform is upto to you but no where in this does software control anything. It just gets informed whats happened so can stop code or flash messages etc.

Also don't confuse an E-stop which latches when pressed with a Latching Relay because they are not the same. The PMDX relays are just plain relays and soon as the E-stop is released they will become active again. Neils safety relay won't do that. Like wise if any of those contacts melt down closed they will Fail ON Neils Safety relay will sense this and won't allow restart.