Confirming PSU spec for steppers.

[irving2008]

Mike,

Can I suggest you get some terminology correct, it might save you some pain (physically and metaphorically) later

When referring to AC (mains) its Live, Neutral, Ground The colours being Blue, Brown, Yellow/Green

When referring to AC (transformer secondary) its AC Secondary and general practice to use Brown

When referring to DC then its +/positive, -/negative, chassis ground and colours are generally Red, Black, Green


Here's a sample circuit with estop and interlocks. Turning on the main switch powers up the +24 volt safety circuit. Push to start closes relay 1 (AC side) and powers up the +70v and aux supplies. Relay 2 (LV side) also closes holding in the relays unless the eStop is triggered. As an example I've shown one set of Realy 2 contacts switching the bleed resisors though I personally don't bother and have them permanently connected.. Other arrangements are possible...