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Continuous Loss-in-Weight Blenders Chapter 6: Appendix
59
Advance PID Options (mass flow setup)
Sample Time once in Steady Window for FIFO
This is how often the control takes snap shots of the mass flow hopper and enters the number in
the FIFO table. For quicker FIFO updates you would decrease this number. For a more stable
process you would increase this number.
Steady System Limit
This is the allowable percent deviation around the median. The median will be half way
between the re-fill set point and the hopper size set point. For material that varies in bulk
density or does not flow consistently you may have to increase the limit.
Steady System Time Test
This timer is used to determine whether or not to show the Steady System flag on the main
control screen. Rather than going in and out of stable, the process must remain stable for the
set time and then the Steady System will be shown.
PID Timer
This is the amount of time that the blender will run without making a change to the auger
speeds to adjust the blender though put i.e. pounds per hour.
PID Gain
The gain increase or decreases the size and speed of the adjustments made to the PID. A
smaller number makes slower adjustments. A bigger number makes faster adjustments.