CONTREX MLP-Drive - Manual (Page 57)

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Follower Mode
The Follower mode of operation is the most frequently used mode of operation. It is a
multi-motor operation in which the entire process can be controlled by any number of
motors and MLP–Drives.
The MLP–Drive allows you to control your system in Follower Engineering Units
(e.g., Follower to Lead ratio or percentage of RPMs, gallons per minute, feet per
minute). The Follower Engineering Units that you want the system to operate at are
entered into the two available Follower Setpoints (CP-03 and CP-04). However, before
the MLP–Drive can determine how to operate at these setpoints, you must enter
Scaling Control Parameters into the MLP–Drive. Scaling is a convenient method for
translating the relationship of the Lead and Follower motor RPMs into Follower
Engineering Units. Scaling Control Parameters give the MLP–Drive the following
information:
Max RPM Lead (CP-33)
Measured at the Lead sensor shaft, this number is the maximum RPMs
at which the Lead will operate in your system.
Max RPM Feedback (CP-34)
Measured at the sensor shaft, this number is the maximum RPMs at
which you want the follower to operate when the Lead is operating at its
maximum RPMs.
PPR Lead (CP-30)
The number of gear teeth or number of encoder lines on the Lead
sensor per revolution (pulses per revolution).
PPR Feedback (CP-31)
The number of gear teeth or number of encoder lines on the Follower
feedback sensor per revolution.
Follower Engineering Units (CP-21)
Enter a number that will represent the setpoint Engineering Units when
the Lead and Follower are operating at their maximum RPMs. This
number is usually either the ratio of Max RPM Feedback (CP-34) to
Max RPM Lead (CP-33) or the ratio of Follower to Lead Engineering
Units at maximum desired RPM. When this number is also entered as
a setpoint (CP-03 or CP-04), the Follower will operate at maximum
desired RPM when the Lead is at maximum desired RPM.