Hello to all!
I would like to share my experience on installing an HP UHU controller on a big Gambin3C mill.
I got this machine electrically out of order some years ago and I aim to convert it to CNC.
Initially all the feed movements were motorised using a big 5 KW CC motor under 250V. The original electronics was based on thirystors for slaving the motor's speed using a thachometer attached to the motor.
This system was out of order and was unsuitable for CNC use.
So I've build an HP UHU drive kit(ordered to Paul, Great thanks Paul!), changing the originals IRFP 264 by IXFH 30N50, suitable up to 500V and changing the original 100K resistors on IR21844 to 150K to increase the deadtimes and minimize cross conduction hazards.
Today the drive is mounted on the machine and the first tests including machining were OK.
You'll see some DIY boards used to generate suitable signals to the UHU and to control most of the functionalities of the machine in a conventional use.
The next step is to keep the actual motor and control for Z axis and motorize with servos X and Y axis.
But before that I need to find a ballscrew for the X axis and some time of course.
English is not my native language so be indulgent please!
Here are some photos of the set up on the link below.
http://www.usinages.com/avances-auto...n3c-t9761.html
Regards.
Jean-Claude