CONTREX MLP-Drive - Manual (Page 81)

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Inverse Master Mode
The Inverse Master Mode is a variation of the Master Mode. The Inverse Master Mode
has an inverted setpoint. If you increase the value of the setpoint (CP-01 or CP-02),
then the motor speed will decrease. Inverse Mode setpoints generally use engineering
units of time.
With the Inverse Scaling (CP-62) set to “2”, enter values in the Master Setpoints
(CP-01 and CP-02) that represent the E.U. at which you want the system to operate.
The higher the setpoint value; the slower the motor speed. Inversely, the lower the
setpoint value; the higher the motor speed.
The MLP–Drive comes factory pre-loaded with the default Control Parameters for the
standard Master Mode. These default settings are not suitable for Inverse applications
and require modification. The factory default Control Parameters for the standard
Master Mode are found in Table 3-31. To modify these default parameters, refer to
Table 3-32.
Table 3-31 Default Inverse Master Control Parameters
CP Parameter Name Parameter Value
CP-62 Inverse Scaling 1 (Standard Scaling)
CP-20 Master E.U. 2000
Table 3-32 Entering Inverse Master Control Parameters
CP Parameter Name Parameter Value
CP-62 Inverse Scaling Enter “2” for Inverse Scaling.
CP-20 Master E.U. Enter the Master Engineering Units value
if the system were to operate at the
maximum RPMs entered in (CP-34).