Allen Bradley solution for flying shear

JRW

Member
Join Date
Jun 2002
Location
South Carolina
Posts
2,284
What AB product would be used for a flying shear?
The application is a rotary drum with a knife blade to cut moving material.
 
Kind of an open ended question from a pro like you isnt it?

I have several machines that have to cut paper at a certain length, the knife is on a drum (cylindrical object) but activated by air to cut.

Maybe you should offer more details on the application. If you want I can send the program for my application. It involves Siemens S7-300's.
 
ControlLogix

I am currently doing my first ControlLogix motion project and I must say AB have done a great job - loads better than a seperate motion controller that we traditionally use.
I'm using cammed motion alot, so a flying shear should be no problem.
 
There are a few issues related to controlling a rotary shear. First, you need to match the speed of the knife to the speed of the product while the knife is making the cut. If the length of the cut product is equal to or less than the circumference of the rotary knife, then all you need to do is make sure the knife drive can follow the product speed. When the knife speed gets too much faster than the material speed, you begin to tear the material instead of shearing it. If the knife speed is slower than the material, the product backs up upstream of the knife, and may jam.

If you need to accurately cut a range of lengths with the same knife, then you'll need to vary the speed of the knife while the blade is out of the material in order to get cutoff lengths longer or shorter than the knife circumference. That's a motion control application, and you need to carefully match the servo motor to the knife inertia for peak performance.
 
OK- so from Paraffin Power,it sounds like ControlLogix is the
AB solution.
And you are right Ron, I was pretty slack on my question, but Steve summed it up.
I have done it (in the drive) with Siemens Masterdrives- but I like to know how the competition dones it.
Sounds like alot of parts and pieces with AB.
Where's Ken's response?
 
A-B's top end standalone motion controller, the Ultra 5000, has a flying shear and a rotary knife application as part of the demo application collection that comes with the controller. If you're looking to automate just the flying shear and not much of the surrounding equipment, then the Ultra 5000 might be a good way to go about it.

ControlLogix motion control is actually a very few pieces and parts; the CPU, the motion module, the amplifier, and the motor. It's especially clean if you use the Ultra 3000 amplifiers with a SERCOS loop; the wiring of the motion module is down to two optical connectors and there isn't even a motion controller parameter configuration and tuning software package (Ultraware); it's all done within RSLogix 5000.

I'm not a motion control expert; I mostly work in discrete control and networking. The Ultra 5000 is a little intimidating to me because of it's C programming, but guys who routinely use products like Delta Tau tell me it's old hat.

RSLogix 5000 programming is less difficult to learn; motion control instructions like "enable axis", "enable gearing" and "execute move" are ladder instructions just like any other.
 
Ken- Can the Ultra5000 be used with standard induction motors (really vector with encoder),
or does it have to be a servo?
 
I don't know; the Ultra 5000 is out of my area of expertise. Probably there's a motion specialist at an A-B office near you who knows it better. I've just seen the glossy brochures and helped somebody set up their DeviceNet interface on it once.
 

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