conect 121 new toy

[Ross77]

You really need to find out what the spindle drive is. Mine was a SCR style drive (very common for DC motors), which means the speed control terminals are at near mains voltage. Connect them to anything other than an isolated 0-10V, and something will be releasing magic smoke.

Dam, I have no idea what drive it is. The machine is from 1986 and has the Lander control board. it does look like the input is 240v and there is a transformer before the motor.

[m_c]

Post up some photos.
It won't be a transformer, it'll be a choke.

I know mine came with a Cheetah drive, but I had to replace it with a KBIC, as the Cheetah was blowing fuses.

[Ross77]

Thanks, you pointed me in the right direction. bit of googling and it is an SCR drive and its a Neco one. Ive found the 3 control wires but not sure if the enable will be ground, +5v or +10v

Will I damage it trying different combinations?

Ultimately I think i Will have to replace the motor and drive but it would be good to get it running to make sure the lathe can manage what I want to do with it.



Tracing back the spindle control side of the main controller it seems to be fed from a dedicated 20v Dc circuit.

[Ross77]

Thanks to some dodgy wiring on my part the controller has deceased.

So on to plan B then and a new controller. Other than the KBIC are there any other good 180V Dc motor controllers?

Reversing and braking would be good