11
4.3 Motorized Valve Control
Information.
• Motorized valve control with or without feedback – position-proportioning (with
feedback) or boundless (without feedback).
• Ratio and bias settings can be applied to adjust the range of valve travel (position-
proportioning only).
• Deadband setting – adjustable to minimize hunting of the motorized valve.
4 CONFIGURATION…
P.I.D. Output
Desired Valve Position
Engineering Range
Ratio Setting
(0.010 to 9.999)
Bias Setting
(within Eng. range)
100
50
0
A 1.0
B 0.5
C –25%
B 0%
Ratio Bias
Proportional
Bandwidth*
80
20
A 0%
100%
0%
Valve
Travel
Limits
75%
25%
Valve
Travel
Limits
50%
0%
Valve
Travel
Limits
Valve
Open
Valve
Closed
C 0.5
AB
C
Fig. 4.2 Position-Proportioning Schematic Diagram
To Next Page
Loading...
