Need Help!- 3 Phase AC Power Supply/Controller Question

[jigidyjensen]

Ok, I have an understanding somewhat of electronics, but not so much about anything multiphase. I hope I can make my question make sense.


I bought Power Supply/Controller from the following website:

AC Servo Drives

Controller: EB-10

And they told me that the controller can be hooked up directely to 3 phase AC power as it is the controller and power supply for the servo.

I am throwing the servo on a knee mill to control one of the axis's. Ok, so the knee mill happens to run on the same three phase power and voltage. So can I simply connect the controller that I bought to the same plug as what is being used to run the motor on the knee mill, or do I need to have a separate outlet installed? I imagine that I can as most CNC's run on the same type of power and multiple servos and motors in them, but only go to one plug, but just want to double to check to make sure that I don't do anything stupid.

I think the motor for the knee mill is 3-phase AC induction motor, is that going to throw that off at all from there being an extra load?

[Al_The_Man]

First, AC servo's are rarely if ever AC induction motors.
They are predominantly permanent magnet.
Normally if the motor is sufficiently large enough, this may warrant a 3 phase supply to the servo drive, just because a DC supply originating from 3 phase instead of 1 ph is more efficient.
The AC supply, whether 1ph or 3ph is converted to DC and then AC sinusoidal variable frequency and amplitude wave form is produced electronically.
The drive is then controlled by various input methods from the external controller.
Feedback is usually either via encoder or resolver.
The bottom line is, is if the voltage is suitable then the input 3ph power is fine.
Al.

[jigidyjensen]

Thank you so much for your reply, I figured I could, but I always try to be careful when I venture out into waters that I have never been before.

Also, I knew that the AC servo was actually DC in practice. The induction motor that I was referring to was the one that the turned the spindle that is already on the knee mill, not the servo that I am installing. I could absolutley be wrong, but I think that one is actually an induction motor. So, one of the questions I had was would the knew load from the servo mess that up at all, or even if it did would it be so small that it wouldn't matter.

Like I said, I am clueless when it comes to this multiphase stuff.

[Al_The_Man]

One should not interfere with the other, Is the spindle fed directly off of the 3 phase or is there a controller of sorts? VFD?
Al.

[jigidyjensen]

The only control is mechanical gearing for a high and low, and then also a handle the varies the speed by using one of the belts and pulleys that move the belt up and down on two tapered shafts to change the speed.

[Al_The_Man]

Sounds like the same set up as the Excello's I converted, see post #10 for conversion to single speed with VFD.
http://www.cnczone.com/forums/ex-cel...mill_info.html
Al.

[jigidyjensen]

Thank you, I appreciate your help.