CONTREX MLP-Trim - Manual (Page 15)

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Figure 1-2 is an example of the Follower mode of operation in a pump application. The
scaling format allows the operator to enter the setpoint as a ratio of ingredient B to
ingredient A. The MLP–Trim compares the setpoint ratio to the Follower sensor shaft
feedback and Lead sensor shaft feedback to calculate any speed error. When the
MLP–Trim finds speed error, the control algorithm adjusts the Speed Command Out to
the motor drive and reduces the error to zero.
Figure 1-2 MLP–Trim Follower Mode
Motor Drive MLP–Trim
Speed
Command
Out
Lead Motor
Sensor
Pump
Feedback Frequency
Motor Drive MLP–Trim
Speed
Command
Out
Follower Motor
Sensor
Pump
Feedback Frequency
Ingredient B
Ingredient A
Follower
Lead
Final Product
Lead Frequency
Contre x
CODE SELECT
SET POINT
TACH
7 8 9
4 5 6
1 2 3
0 – .
ENTER CLEAR
ontrex C
ontrex C
Contre x
CODE SELECT
SET POINT
TACH
7 8 9
4 5 6
1 2 3
0 – .
ENTER CLEAR