Instruction Manual

DVC6000 SIS
September 2013
4-12
To select an input characterization, select Input
Characterization from the Response Control menu.
You can select from the three fixed input
characteristics shown in figure 4-1 or you can select a
custom characteristic. Figure 4-1 shows the
relationship between the travel target and ranged set
point for the fixed input characteristics, assuming the
Zero Power Condition is configured as closed.
You can specify 21 points on a custom characteristic
curve. Each point defines a travel target, in % of
ranged travel, for a corresponding set point, in % of
ranged set point. Set point values range from −6.25%
to 106.25%. Before modification, the custom
characteristic is linear.
Custom Characterization Table (1-2-2-4)
To define a custom input characteristic select Custom
Characterization Table from the Response Control
menu. Select the point you wish to define (1 to 21),
then enter the desired set point value. Press Enter
then enter the desired travel target for the
corresponding set point. When finished, select point 0
to return to the Response Control menu.
With input characterization you can modify the overall
characteristic of the valve and instrument combination.
Selecting an equal percentage, quick opening, or
custom (other than the default of linear) input
characteristic modifies the overall valve and
instrument characteristic. However, if you select the
linear input characteristic, the overall valve and
instrument characteristic is the characteristic of the
valve, which is determined by the valve trim (i.e., the
plug or cage).
Dynamic Response (1-2-2-5)
 SP Rate Open (Minimum Opening Time in
firmware 3−6)—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 10 and below this parameter
should be set to 0.
 SP Rate Close (Minimum Closing Time in
firmware 3−6)—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 10 and below this parameter
should be set to 0.
Travel Target, %
Ranged Set Point, %
−25 0 125100
−25 0 125100
−25 0 125100
Input Characteristic = Linear
Input Characteristic = Equal Percentage
Input Characteristic = Quick Opening
100
0
−25
125
Travel Target, %
100
0
−25
125
Ranged Set Point, %
Travel Target, %
100
0
−25
125
Ranged Set Point, %
A6535-1/IL
Figure 4-1. Travel Target Versus Ranged Set Point, for Various
Input Characteristics (Zero Power Condition = Closed)
4