AndyUK's Build - 1.2x1.0m Gantry

[AndyUK]

Good point about the diode protection from back emf, I have placed mine directly on the relay to protect the coil from back emf.
What do I miss about the resistors on the enble+ line? I mean obviously the resistors will reduce the current flow but how much is the current that will run if the resistor is not there and how much is acceptable?
I have the AM882 that is why I am asking!

The AM882 has the same logic signal current specifications as the EM806 (hardly surprising considering they're basically the same thing, but I thought I'd check). 7-16mA with a nominal of 10mA. They've designed it for a 5V signal, so I expect the internal resistance is ~500 Ohms (because that's what gives 10mA for 5V). V=IR, so I = 24V / 2.5kOhm = 9.6mA. (I used 2.5kOhm because my 2k resistor plus 0.5k internal).

Or, you can just read the diagram in the driver's manual about the connection where it specifies in a small box below that you need to add a 2kOhm resistor if the signal is 24V, which is a far simpler way to do it!

We don't need the resistors on any of the other lines - The pulse and direction outputs from the UB1 are 5V signals, and the alarm signal is an output not an input, so it has different specifications.