Motorized Valve Control - ABB COMMANDER 300 Programming Manual

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.
P.I.D. Output
Ratio Setting
(0.010 to 9.999)
100
80
A
50 B
C
20
0
Ratio Bias
Bias Setting
(within Eng. range)
A
1.0
B
0.5
0.5
C –25%
Fig. 4.2 Position-Proportioning Schematic Diagram
Valve
Travel
Limits
Valve
100%
Open
0%
0%
Valve
Closed
A
4 CONFIGURATION...
Desired Valve Position
Valve
Travel
Limits
75%
25%
0%
B
Valve
Travel
Limits
50%
0%
C
11