[lavrgs]

Can someone give me a clue on what a regen unit does? I have one in my Tree 325 and I have no idea what it does.

Thanks

[Geof]

Do you mean the regen resistors for braking the spindle?

[lavrgs]

The unit I have is about 12x4x4 This is part of the Fanuc spindle driver electronics. I read that it is used for braking but I don't know if all motors can use it or if its only a requirement for certain motors or if its used in combination with a motor and the drive.
I am seeking to replace my Fanuc drive and expect I'll need this but for some reason finding clear information about motor systems has been difficult.

[Al_The_Man]

It serves two purposes, assists in braking the motor for faster stopping and prevents bus over voltage by switching the regenerated voltage into a resistor bank when overvoltage occurs.
Depending on what drive you are looking to integrate, most VFD's accept external braking as an option.
Al.

[lavrgs]

One of the things I am trying to do is determine a spindle drive that would be appropriate as a replacement. I don't want to "buy and try", I would like to have a high level of confidence that what I get will work before I get it.

What I know
Fanuc - model # A06B-1002-B600 #2000
200V AC
4 pole
3 HP 5 HP Peak
11 Amps 15 Amps peak
1800-8000 RPM
There is an encoder on the motor

The original control Fanuc a06b-6052-h002