After the previous post, all the necessary bits were soon bolted into the enclosure -
Screwing and bolting done by
mc_mtb, on Flickr
And the wiring could commence -
Wiring part 1 by
mc_mtb, on Flickr
As it stands, all the internal wiring is pretty much complete. The only outstanding issue is I need to find the bleed resistor for the stepper power supply...
I only started out with a rough wiring diagram without too much thought towards wire routing, which is why the right hand trunking is empty, and will most likely stay that way. Thankfully there was just enough DIN rail for mounting all the bits on.
For those looking to build a control box, I'll run through what's on the rail, starting at the left.
240V positive distribution, consisting of one terminal, and four fuse holders (TX, 24V PSU, 5V PSU, Cooling Fan)
240V neutral distribution, consisiting of 4 terminals.
GND block. This acts as the star point for all GNDs/cable sheilding.
Emergency Stop relay. Given this is only a probe, and I have no intention of using it with a spindle, I opted for a basic E-stop system. The relay is powered by 24V via a single E-stop button, with the relay controlling the power to the transformer, and also the second contacts disabling an input to the KFlop, so it gets notified to stop.
24V PSU. This is just a basic DIN rail mounted switched mode power supply. This is probably the cheapest way to buy a regulated 24VDC for control purposes, and I love the fact it just clips on a bit DIN rail, without faffing with even more screws/brackets.
24V postive distribution.
Clamping block simply to create an obvious gap.
24V & 5V negative distribution. Both supplies have thier negatives connected together, and it gets ditributed from these terminals.
5V PSU. Definetly not the cheapest way to get a 5V supply, however I'm willing to pay for the convenience.
E-Stop connection terminals. As this build will only have one E-Stop button and nothing else that can trigger an E-stop, these aren't really needed. However they provide a convenient way of quickly bypassing the E-stop circuit.
This is definetly not a typical hobbyist type of build, but I wouldn't go as far as calling it an industrial build, as it is lacking in a couple safety related areas.
I have powered it all up. The fan spins, the 24V and 5V PSUs light up, the KFlop blinks into life, and the stepper supply magics up 45VDC when the E-stop circuit is completed, so all is good so far. Next step is what I class the external wiring, which is basically all the wiring that leaves the control box and connects to the machine, such as the stepper motors and the probe.
This machine isn't getting any limit or home switches. Position repeatability between power offs isn't a concern, so accurate homing isn't needed, and the machine won't have enough power to do any damage if it runs into the end of travel!