66
NDX VALVE CONTROLLER
Bypass Signal Modifications
Defines whether Signal Modification parameters are applied or
not.
Affects following parameters:
• Signal direction
• Cutoff closed
• Cutoff open
• Cutoff type
• Valve Target Position Low Limit
• Valve Target Position High Limit
• Dead angle
• Split Range Low
• Split Range High
• Max Travel Speed To Close
• Max Travel Speed To Open
• Characterization Type
• Shape Factor
• Flow Modification
0 %
Yes (Signal modifica
tions are discarded.)
No (Signal modifica
tions are applied to
original setpoint, and
the control module
then follows the mod
ified setpoint.)
Flow Modification
Fig. 62
Parameter name
Description
Default value
Limits/options
Characterization Type
Linear: Flow Modification is not used
Shape Factor: Flow Modification is used. If you select this
option, enter a Shape Factor value.
User Curve: You can create a custom table. If you select this
option, manually edit the Values as necessary.
Not Used (Linear) Not Used (Linear)
Shape Factor
User Curve
Shape Factor
Shape Factor describes the nearest approximate or the exact
shape of the valve characterization transfer function based on
the following hyperbolic function:
f(x) = x/(S+x(1S))
where
S = Shape Factor
x = normalized (0100%) Setpoint value
f(x) = an intermediate calculation of the Target Position.
If Shape Factor is between 0 and 1, a quick opening transfer
function is applied.
If Shape Factor is 1, a linear transfer function is applied.
If Shape Factor is larger than 1, an equal percentage transfer
function is applied.
1
0.01 – 100
13 DEVICE TYPE MANAGER (DTM)
