Hello guys, I have a system of 3 load cells (SP4M-7Kg) attached to a Micrologix 1500 analog inputs. in the same PLC i have 3 coils for a vibrator, each vibrator is working with signal generators. and the load cells with an external 24vdc Power Supply.
i see my load cells readings fluctuating too much even with the vibrator not working. if it is set lets say 70 Grams it is jumping from 68.4 to 74.8 going up an down never never stabilizes in one number, so i suspect am getting noise somewhere put a 100uF capacitor PLC inputs for the load cells but weight just increases more and more.
How can realize where is the noise comming?
what can i use as a filter?
how can i improve this system? should i changed it to digital?
any help welcome! thanks.
questions?