CONTREX ML-Drive - 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 (MP-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) until the system
becomes unstable, then increase it slightly until the system stabilizes. Reduced values will
increase Gain (CP-65). To verify the stability of the speed changes, you can access Tach
through either the Tach key or the Control Parameter for 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 Control Parameter for Tach
(MP-40).