Be very careful with the 611 drive.Some of the early servo controllers fitted to machines do not have phase loss protection.If a phase goes down while power is applied to the 611 it will blow.I have one here on a retrofitted Warner Swasey I bought.Put the main panel isolator on one day,powered the machine up,it came up,the lights flickered and it died.Found a fault in the main disconnecter,replaced it,powered up and got one of the bigger bangs I had heard in a long time came from the drive.Called up Siemens and explained what had happened,the guy asked "has a phase gone while power was on the drive?"
Yes."well you have lost the drive,you will have to return it to us for repair"
You can now buy a little box to add to the drive that senses the power going and shuts it down before damage is done.
So I have estimates of $2000-$2500 to repair this but it could be repaired and a mains failure occur the next day and bang it`s gone again.Other thing I don`t like about them is dc link voltage of 660 volts.Fatal stuff if you get caught by that.
If you have an email address I can post you pdf`s for the drive if George can`t find his.
Mark.  |