Kinetix and Loadcell

[consol]

Hi,
Is it possible to use a loadcell directly connected to a Kinetix drive?

We currently have the loadcell connected to an analog card on a controllogix.
We need to stop a drive when a pressure sp is reached, however, we're getting overshoot that we think is due to scan.

Thanks.

 

[OkiePC]

Load cells typically work in the low millivolt range, so I think you will at least need a signal conditioner, which should be faster than a PLC. I am not familiar with Kinetix. What sort of analog inputs are available to you?

http://www.omega.com/pptst/DRF-LC.html
http://www.phoenixcontact.com/signal-level-matching/31244_14920.htm

 

[MichaelG]

More Information Please

What is your load cell update rate? What is the RPI of the Analog input?

How fast can the Pressure change per drive increment - ie a 1 mm move on the drive with a surface area of 10 mm^2 can cause a huge pressure change vs 1m^2
What speed are you moving the drive at?

How are you controlling the Kinetic Drive ?

How fast is the requirement to make pressure, eg a 100mm move in 0.2 seconds or 0.05 seconds

Some rungs that you are using as a minimum would be good, The whole program better if allowed.


Personally I would probably work out the Pressure scaling compared to drive Torque Limit and then limit the drive torque during the move - Much faster than waiting for the analog to respond.