Overshoot when the pv moves further past the sp than desired. All primary air dampers are indexed to less than 100 and at least one damper is indexed greater than 85 set minimum and maximum allowable ranges for the duct static pressure setpoint.
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Wat is setpoint cv. The set point is usually abbreviated to sp and the process value is usually abbreviated to pv. Setpoint reset the duct static pressure setpoint up in a gradual manner. It is mostly the input for an actuator that can drive the process to a desired setpoint. Like setpoint changes mode changes can lead to process instabilities and upsets. It can be a static value. Controller output op trends can reveal problems with equipment or the process.
The distinguishing feature of the pid controller is the ability to use the three control terms of proportional integral and derivative influence on the controller output to apply accurate and optimal control. For example if a previously functioning control loop has moved to an output of 0 or 100 and is failing to meet the setpoint that is a good indication of an equipment malfunction or a change in the process. The setpoint sp is where the process output should match. Direct acting causes the output cv to increase when the input pv is larger than the setpoint sp for example a cooling application. This flag is the same as the upper limit except the bit is set when the calculated control output cv exceeds the lower cv limit. The process output is commonly known as process variable pv or measured variable mv.
Sp setpoint the desired value for the pv. Departure of such a variable from its setpoint is one basis for error controlled regulation using negative feedback for automatic control. In cybernetics and control theory a setpoint also set point or set point is the desired or target value for an essential variable or process value of a system. The target value for pv is the setpoint sp ideally the pv should change in a predictable fashion with a change in cv but in a real world situation the load or demand will not be constant thereby altering the relation between cv and pv. Op output a signal to a device that can change the pv frequently a valve damper or a pump speed reference. The duct static pressure setpoint shall remain unchanged if.
Setpoint out of range sp word 0 bit 11 the setpoint out of range bit is set when the setpoint exceeds the maximum scaled value or is less than the minimum scaled value. Setpoint integrated solutions offers process solutions products control relief manual valves actuation instrumentation process automation. Also sometimes called cv controlled value. The block diagram on the right shows the principles of how these terms are generated and applied. Deadband db value from 0 to the scaled maximum or 0 16383 when no scaling exists.
Gallery of Wat Is Setpoint Cv
