Instruction Manual

Instruction Manual
D103557X012
Configuration
January 2015
23
Dynamic Response
D SP Rate Open—Maximum rate (% of valve travel per second) at which the digital valve controller will move to the
open position regardless of the rate of input current change. A value of 0 will deactivate this feature and allow the
valve to stroke open as fast as possible. In firmware 4 this parameter should be set to 0.
D SP Rate Close—Maximum rate (% of valve travel per second) at which the digital valve controller will move to the
close position regardless of the rate of input current change. A value of 0 will deactivate this feature and allow the
valve to stroke close as fast as possible. In firmware 4 this parameter should be set to 0.
D Set Point Filter Time (Lag Time)—The Set Point Filter Time (Lag Time) slows the response of the digital valve
controller. A value ranging from 0.2 to 10.0 can be used for noisy or fast processes to improve closed loop process
control. Entering a value of 0.0 will deactivate the lag filter. In firmware 4 this parameter should be set to 0.
Travel Cutoffs
D Hi Cutoff Point—This is the point within the calibrated travel range above which the cutoff is in effect. When using
cutoffs, a Cutoff Hi of 50% is recommended to ensure valve goes fully open.
D Lo Cutoff Point—This is the point within the calibrated travel range below which the cutoff is in effect. When using
cutoffs, a Cutoff Lo of 50% is recommended to help ensure maximum shutoff seat loading.
Tuning
Field Communicator Configure > Manual Setup > Tuning (2‐2-4)
Travel Tuning
WARNING
Changes to the tuning set may cause the valve/actuator assembly to stroke. To avoid personal injury and property damage
caused by moving parts, keep hands, tools, and other objects away from the valve/actuator assembly.
D Travel Tuning Set
There are eleven tuning sets to choose from. Each tuning set provides a preselected value for the digital valve
controller gain settings. Tuning set C provides the slowest response and M provides the fastest response.
Table 3‐4 lists the proportional gain, velocity gain and minor loop feedback gain values for preselected tuning sets.
Table 3‐4. Gain Values for Preselected Travel Tuning Sets
Tuning Set Proportional Gain Velocity Gain Minor Loop Feedback Gain
C
D
E
F
G
4.4
4.8
5.5
6.2
7.2
3.0
3.0
3.0
3.1
3.6
35
35
35
35
34
H
I
J
K
L
M
8.4
9.7
11.3
13.1
15.5
18.0
4.2
4.85
5.65
6.0
6.0
6.0
31
27
23
18
12
12
X (Expert) User Adjusted User Adjusted User Adjusted