Quote Originally Posted by JAZZCNC View Post
Well why bother with the Pilz relay or any of the safety stuff if your taking this approach just wire everything together direct and be done with it and keep your hand on the plug.!!! . . . . Now the fact your asking why for such an obvious concept worry's me slightly so maybe you should be asking if your upto to doing this without help from someone more electricly minded.?

AC contactors will work ok because again there coils pull relatively little current so the Pilz Relay contacts are not under heavy loads. It's just prefered to keep low voltage for safety and simplicity reasons.
hehehe don't worry I understand your point but what confused/confusing me is my idea of connecting the safety relay, from what I understood from the documents I read is that I can hook the fault lines of EM806 in series to the safety relay as well as my VFD which has NC points, in that case if any fault happens (EM806 is really good at detecting faults) they should open one of the connections and then all drivers and VFD will stop to work ( the VFD also mentions in its document that I can use one of its relay output contacts to behave like fault line, and the VFD can detect stuff like current overload and such). all of this also in addition to E-stop button which would open the fault line connection as well.

so I thought the power to everything can be on, its just in case of any driver detecting any fault it will open its fault connection and the relay will cease giving signal to all of them.

if my concept is not right please let me know and I guess I will just do the contactors way if required.