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US 8,326,463 B2Granted
Digital position transmitter
AssigneeABB AB
InventorsAndreas Wahlmann, Thomas Kleegrewe
Life of this patent
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Abstract
The disclosure relates to a digital position transmitter for control of an actuating element having a positioner in a process installation, with the position transmitter having a regulator with a dead band in order to suppress disturbance signals. It is proposed that the dead band in each case lags the set-value change asymmetrically with respect to the set value.
Claims7
An arrangement for control of an actuating element having a positioner in a process installation, comprising:
- a digital position transmitter having a regulator;
- a position sensor that signals travel of a valve rod to the position transmitter;
- control electronics that compare detected travel of the valve rod with a set value;
- an I/P converter of the position transmitter operated by the control electronics for conversion of an electrical control error to an adequate control pressure;
- and
- an actuating drive connected to the I/P converter via a pressure medium supply, wherein the regulator includes a dead band to suppress disturbance signals, the dead band having an upper or lower edge that matches the set value.
3 more elements
Dependencies are inferred from the claim text.