Filter Constant improves the accuracy of a calculated line speed. It filters the velocity that is calculated by sampling the number of encoder counts over a fixed period of time.
It can be adjusted in order to improve accuracy. A low value should be used on machines with very stable line speeds. A high value (greater than 50 Hz) should be used when significant fluctuations in line speeds occur. The default value of 32 Hz is considered to be a proper value for most lines. The XL200 Series controller will allow values from 1.0 Hz to 200.0 Hz.