Hardinge KL-1

[pauly45]

Well, the wiring is pretty much finished now.

There's a little tidying that's needed, but here is the control panel.
The original 'green' power on, and forward/reverse switches do the same job as before.
Theres a red indicator for the 240V_ac being available.
The small LED next to the forward/reverse switch is off when the main motor VFD is at 0Hz.
Theres a key switch to really make sure it can't be turned on accidentally.

I've put two fans in the front to get blow some air circulation in through the VFD's, and when I can get to the rear, I'll put two more in to suck air out of the cabinet.


And the cabinet wiring.



I think it functions quite well. I like the fact that I don't have to fiddle around with the vfd controls to work it, and overall, the lathe feels just like it would if powered from 3 phase.
The original lathe forward/reverse, high/low speed, faster/slower and pump on/auto switches all work the vfd's
The only thing I have yet to sort out is the brake.

A small niggle is that it is possible to have the high and low speed contactors trying to be on at the same time if I move the lever from high to low before the vfd has reached 0Hz.
It's not a big problem as they are interlocked so they cannot actually be on at the same time, but they buzz a bit if I don't wait until the motor has stopped.
Something to figure out later I think !

As soon as I can figure out how to save the circuit diagrams in sufficient detail, I will post them up.