Flowserve Modutronic 20 II Modulating Position Controlle - Manual (Page 10)

Limitorque Actuation Systems Modutronic 20 II FCD LMENIM4002-00 – 08/06
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Definitions
Figure 3.1 – Calibration Positions
Command Signal Input signal provided by user to assign the desired valve position.
Deadband Adjusts the maximum allowable error signal. (Difference between the Position
Command Signal and Position Feedback Potentiometer Signal). Selectable on the Mod 20 II DIP
Switch. See Table 6.1 for DIP Switch setting chart.
Proportional Band (Pulsing Window) controls the point on the scale of valve travel that the motor
begins the pulsing mode. (Increasing GAIN decreases the window width).
Adjusting the GAIN Potentiometer fully CW z (increasing GAIN/decreasing pulsing window), sets
the GAIN to its maximum setting causing the motor to run continuously up to the Set-Point before
power is turned off from the motor.
Adjusting the GAIN Potentiometer CCW
u (decreasing GAIN/increasing pulsing window), causes
the Mod 20 II to begin to “pulse” the motor on and off as it approaches the Set-Point.
On Time Adjusts the time that the electromechanical contactors or Solid-State Reversers are
engaged while in the pulsing window.
Off Time Adjusts the time that the electromechanical contactors or Solid-State Reversers are
disengaged while in the pulsing window.
Set-Point Desired stopping position for Mod 20 II; determined by the Command Signal.
Span Calibrates the Mod 20 II to align the Maximum Command Signal (normally 20 mA) with the
Position Feedback Potentiometer at the open position.
Zero Calibrates the Mod 20 II to align the Minimum Command Signal (normally 4 mA) with the
Position Feedback Potentiometer at the close position.
•
•
Span
Valve Travel
(Zero/
Minimum
Command Signal)
Valve Travel
Deadband
Proportional Band
(Pulsing Window )
Set Point
(Maximum
Command Signal)
Span
Valve Travel
(Zero/
Minimum
Command Signal)
Valve Travel
Deadband
Proportional Band
(Pulsing Window )
Set Point
(Maximum
Command Signal)