CONTREX ML-TRIM - Manual (Page 147)

C - 11
CP-62 INVERSE SCALING
Use Inverse Scaling (CP-61) to select either the Standard or the Inverse setpoint scaling format.
Enter “2” for Inverse Scaling.
Enter "1" for Standard Scaling.
Inverse Scaling Code
CP-64 DISPLAY MODE FOLLOWER
In the Follower mode of operation, Display Mode Follower (CP-64) determines how the data will
display in Tach (CP-40).
Enter "2" to display the ratio of feedback to lead, in E.U. (Follower)
Enter "1" to display the feedback in E.U.s/Time (Master)
CP-65 GAIN
To achieve an acceptable level of speed error, adjust Gain (CP-65) until the system stabilizes.
With Integral (CP-66) and Derivative (CP-67) set to “0” , reduce the Gain (CP-65) value until the
system becomes unstable, then increase it slightly until the system stabilizes. Reduced values
will increase Gain. To verify the stability of the speed changes, you can access Tach through
either the Tach key or the Tach (MP-40).
CP-66 INTEGRAL
In systems that require greater accuracy, it may be necessary to adjust the value of
Integral (CP-66) to reduce any remaining speed error. In systems with low inertia, the
speed error will be reduced more quickly if you enter low values in Integral (CP-66). An
entry that is too low, however, can create instability or overshoot the setpoint before
reaching the correct value. Generally, use larger entries for Integral (CP-66) on
systems with a large inertia. While switching between the high and low setpoints,
decrease the Integral's default value of “2000” until the speed error is reduced within an
acceptable time frame. To verify the stability of the speed changes, you can access
Tach through either the tach key or the Tach (MP-40).