5
Appendix
5.1 Special KCM LWF features
Page 84
Docu-No.: 0590020601-EN Rev. 1.6.0
5.1.5
Tuning parameter descriptions
Parameter
Range
Description
Adaptive Gain
5-100%
If the adaptive gain feature of the KCM is <On>, this
value shows the amount of adaptive gain set by the
controller.
Self Tuning: On
The adaptive gain will automatically adjust to give
the best gravimetric performance.
– Value depends on the weight sample quality
– High value = good quality feeding (small
massflow deviations)
Self Tuning: Off
– Value is fixed and can be changed manually.
– Increase value = more responsive control.
– Lower PERT Threshold
Massflow/Display filter
0 to 999
[sec]
Settling time (90%) of the massflow estimate. A
longer time yields a smoother massflow display.
Note:
This variable does not influence control response.
SFT Cut-Off Freq
Filter setting from gross weight. Normally, with Self
Tuning set to <On>, the SFT Cut-Off Freq will
automatically adjust to give the best possible
gravimetric control.
Self Tuning: On
– Setting is dependent on setpoint. On small
setpoint values, it will be reduced towards
0.033 Hz.
Self Tuning: Off
– Value is fixed and can be changed manually
– Value may not be greater than 0.4 Hz for
normal operation but may go as high as 2 Hz
during refill.
– Increasing value, increases control response
and control is more sensitive to weight
disturbance.
– Decreasing value, makes the massflow more
stable and control slower to respond.(more
sluggish)
Example: Expected response time to gross weight
reading after a weight step change.
• SFT Cut-Off 0.4 Hz = 2.5 seconds
• SFT Cut-Off 0.1 Hz = 10 seconds
