- VFD control signals (direction, speed, "spindle stopped", drive error etc).
- Power drawbar (PDB) interlock circuit (12V feed to the PDB SSR and return via the VFD open collector drive error output).
- Probe signal and probe detect inputs. I'll be wanting to use my Renishaw MP-1 probe, once I've doctored it to work on DC signals.
- Coolant pump drive (240V via a 10A SSR).
- Limit and home switch inputs. The limit switches will all be commoned. So will the home switches, so that accounts for 2 of the 8 free inputs.
Wired up the front door of the cabinet. The mains comes in to the 32A isolator, then onto a 16A MCB, then onto the baseplate. There's a 240VAC fan on the door too, so this has its own 6A isolator. Finally, there's the "remote digital operator" panel for the VFD. In this system it simply indicates the motor RPM and can be used for programming the VFD if you can't be arsed to open the door and use the main VFD panel.
Fitted the baseplate into the cabinet. Removing the Big Fuck Off Transformer makes the panel more manageable and it's pretty simple to reinstall once the baseplate is secured. Then wired up the mains feed from the front door and the motor connection to the VFD.
Now it's just a matter of connecting up the various servos, switch inputs, lube and coolant pump, PDB etc.
I'll run the coolant and lube pump feeds in their own conduit and run them into the bottom of the cabinet. There's a convenient hole in the base casting and I have a piece of steel sheet left over from the spindle position sensor cover that is just the right size (and colour) to make up a gland plate for the conduit. That'll do:
I'll be fitting a proper 32A IEC plug once I actually get around to buying a suitable wall mounting socket. For now I'm going to fit a 13A mains plug. Found this old Duraplug ("Made in England"!). Yes, it's got a 13A fuse - wouldn't been the first time I'd been caught out by a 5A fuse.
Next - connect up the various servos etc.......
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