Yes Bert what you say it's true, UB1 needs only 24volts which converts it to 5 volt , with some restrictions,has on board 3 relays , from those you can control a sequence , powering up power relays etc.and other features.

My problem is that it is more complicated than the one and only 5$ bob I have ever install, at my previews cnc and also much more expensive, the last one makes me more nervous to experiment! I must be a 100% sure before power it up!

My parts are:
2x AM882H
2X AM882
1x78Volts PSU 7Amps
2x12 volt psu 330watt
HY VFD with 2.2kw water cooled spindle
water pump...etc.
I hope I did n't forget a major component , if i remember something I will edit my post.

Thanks,Nick.