CONTREX ML-Drive - Manual (Page 59)

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Inverse Follower Mode Example
The Inverse Follower Mode Example demonstrates how the scaling and setpoint
Control Parameters are entered for a typical Inverse Follower mode of operation:
In a wire machine twisiting application, the Follower twists the wire as the Lead
pulls the wire. When the Follower is at the maximum revolutions per minute of
1800 RPM and the Lead is at the maximum revolutions per minute of 2000
RPM, then the twist length (lay) is at its minimum of 2.0 inches. The Follower
motor uses a 1200 PPR encoder and the Lead motor shaft is equipped with a
60 tooth ring kit. Follower Setpoint 1 is setup for the minimum twist lay of 2.0
inches. Follower Setpoint 2 is setup for a twist lay of 5.0 inches.
Table 3-18 shows the scaling Control Parameters that would be entered in the
ML–Drive for this example.
Table 3-18 Inverse Follower Mode Control Parameters Example
CP Parameter Name Parameter Value
CP-62 Inverse Scaling 2
CP-30 PPR Lead 60
CP-31 PPR Feedback 1200
CP-33 Max RPM Lead 2000
CP-34 Max RPM Feedback 1800
CP-21 Follower E.U. 2.0
CP-03 Follower Setpoint 1 2.0
CP-04 Follower Setpoint 2 5.0
After the Scaling and the Follower Setpoints for your system have been entered, you
can enter the Acceleration/Deceleration Control Parameters for the Inverse Follower
mode. The Acceleration/Deceleration Control Parameters are identical for both the
Inverse Master and the Inverse Follower modes of operations. Acceleration/
Deceleration is discussed in the following section.