CONTREX M-Traverse - Manual (Page 64)

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Follower Profile Parameters
In addition to being part of a setpoint pair, the traverse length acts in conjunction with
the Accel/Decel Length (CP-09) parameter and the Dwell (CP-10) parameter to define
the Follower Profile. The Follower Profile creates a smooth transition to dwell before
reversing directions. This takes place at the reel's end in level wind applications or at
the edge of the web in web scanning applications.
Accel/Decel Length (CP-09)
The Accel/Decel Length (CP-09) parameter allows the Follower mecha-
nism to ramp to either the constant pitch plateau or end dwell, either
gradually or rapidly. This parameter is the number of encoder lines for
the desired Accel/Decel Length. The lower the number, the more
rapidly the Follower mechanism ramps to the constant pitch plateau or
end dwell. The higher the number, the more gradually the Follower
mechanism ramps to the control pitch plateau or end dwell. As a
guideline, keep in mind that you do not want the accel/decel rate to
exceed the load that the motor drive or mechanics can accommodate.
The Accel/Decel Length parameter does not need to be an exact
number, the system will perform adequately with a close estimate.
The factory default for the Accel/Decel Length Control Parameter is found in Table 3-10.
To modify the default parameter refer to Table 3-11. If you are uncertain how to enter a
Control Parameter, review the
Operations: Keypad section.
Table 3-10 Default Accel/Decel Length Control Parameter
CP Parameter Name Parameter Value
CP-09 Accel/Decel Length 0
Table 3-11 Entering Accel/Decel Length Control Parameter
CP Parameter Name Parameter Value
CP-09 Accel/Decel Length Enter the number of encoder lines for the desired
Accel/Decel Length.