We have a machine that has to comply with critical quality regulations, and one of the regulations is the consistency of the selected speed. The speed is set via a potentiometer while a visual display, shows the calculated speed in meters per minute.
The display uses the 0-10vdc from the pot to calculate the speed, the “actual” speed is not referenced from the drive nor from a motor feedback.
Now the speed is set by the operator to say, 6m/min, he then controls the operation of the machine and by the time the batch has passed through the machine the speed display has increased to 7m/min.
I am tasked with the job to regulate this “drift” and keep the machine constant at the desired speed. I do not know what would cause this fluctuation or how to fix this problem. Any advise is welcomed.