This is the beginning of wisdom…
I say this as someone who has, just a few times, gone on autopilot and released the magic smoke that had previously been enabling the electronics to work. But really, going methodically and labeling each end will do wonders.
The wiring diagram you linked to isn’t complete; it doesn’t show (for example) the 24V from the LPS to the controller board to power the stepper motors.
Here’s the theory:
- The LPS controls the laser, so everything that controls the laser including safety interlocks (case, water) connect directly to it.
- The LPS measures the voltage on the potentiometer, so use the LPS 5V supply for the high side of the potentiometer
This LPS has a 24V power supply; you want to use that to supply the stepper motors, so that is the motor voltage that goes to the controller board Edit: As you pointed out, your new power supply has 24V and you can use that to supply the stepper motors. Note that doing this will make it easy to switch to a different LPS later if you ever need to; not all of them supply 24V so this is more flexible.
- Use the 5V from the new power supply for everything else that needs 5V.
- Use the 12V from the new power supply for anything that needs 12V, like LEDs
- All the ⏚ should connect directly to the single ground stud; you don’t want to daisy-chain from ⏚ to ⏚. This is “FG” on the LPS in the diagram, often called “ground”, but also “PE” short for “Protective Earth”. This is separate from the DC GND connections that are a reference against which the DC voltages are supplied and measured.
What size wire you need depends on current. It’s easy to get by with two sizes:
- Use larger gauge wire (18AWG should be fine¹) to carry power:
- GND between power supplies and power consumers
- 5V on PS to board
- You can use smaller gauge wire (24AWG should be fine) for signals:
- G reference for interlock / etc switches, potentiometer
- 5V on LPS (it’s only a potentiometer reference)
- IN (potentiometer wiper)
None of this touches the high-voltage wires from the LPS to the tube.
If @donkjr says I’m wrong about any of this, believe him not me.
¹18AWG is fine as long as the fuse in the IEC socket is 10A or less, I believe.