CONTREX CX-1200 - Manual (Page 395)

C - 49
(Continued)
Appendix C: Parameter Summary Numeric Quick Reference (continued)
Derivative Threshold Velocity Loop (CP-323) is the minimum speed error that is required before the derivative term in the
PID velocity algorithm gains influence. Increase the DerivThd VL (CP-323) to prevent the derivative term from acting on
signal noise.
Minimum Value: 0 Maximum Value: 99999
Default Value: 5 Units: EU/Tm
CP-325 Kp PL
Kp PL (CP-325) is the proportional gain constant for the PID position loop. Increasing Kp PL (CP-325) will have a
quicker the response and a smaller position error. However, a value that is too large could result in overshoot and
instability. You can eliminate most or all of the error in the position loop with the proportional term (Kp PL). Use an
integral only if Kp PL (CP-325) alone can not eliminate the error to your specification.
Minimum Value: 0 Maximum Value: 200
Default Value: 130 Units: Constant
CP-326 Ki PL
Ki PL (CP-326) is the integral constant for the PID position loop. Integral action provides for zero steady state error.
Increase Ki PL (CP-326) for a faster convergence to zero error. However, a value that is too large will cause instability.
Use Ki PL (CP-326) first to eliminate the error to your specification. If this produces unacceptable results, then decrease
Kp PL (CP-325) and introduce the integral by gradually increasing Ki PL (CP-326).
Minimum Value: 0 Maximum Value: 200
Default Value: 120 Units: Constant
CP-327 Kd PL
Kd PL (CP-327) is the derivative constant for the PID position loop. Derivative action damps out overshoots, however,
its effect is limited and is highly dependent on Kp PL (CP- 325), Ki PL (CP- 326) and the given process dynamics. A
value that is too large can cause instability.
Minimum Value: 0 Maximum Value: 200
Default Value: 60 Units: Constant
CP-328 DerivThd PL
Derivative Threshold PL (CP-328) is the minimum speed error that is required before the derivative term in the PID
algorithm gains influence. Increase the DerivThd PL (CP-328) to prevent the derivative term from acting on signal noise.
Minimum Value: 0 Maximum Value: 99999
Default Value: 0.5 Units: EU
CP-329 Max Fb
Maximum Feedback (CP-329) and CO Max Volts (CP-271) are used to calculate a rough approximation for Kff (MP-48).
When a new Max FB (CP-329) value is entered, then Kff reflects a new value also .
Minimum Value: 0.1 Maximum Value: 130000
Default Value: 2000 Units: EU/Tm
CP-330 Max Spd Lmt