[TDiffStepDn21] Temperature difference for step down
Program block, name / node subtype: [TDiffStepDn21] Temperature difference for step down
Library hierarchy: Universal functions
Family: TDiffStepDn
Project tree | Diagram |
|---|---|
|
|
|
Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
Generates a step-down request for the logic for power control and compensation if the main temperature difference (main flow temperature – main return temperature) is too small and goes below a certain setpoint.
Most likely there is a hydraulic balancer (or a storage tank) and the flow temperature is measured at the consumer side and the main return temperature at the generation side.
A small difference between the two temperatures shows that the power of the generation is likely too high and must be reduced.
A parameter in the program defines how the temperature difference is calculated: either between the setpoint for the main flow temperature and the main return temperature, or between the measured main flow temperature and the main return temperature.
A parameterizable delay in the program defines for how long after the plant starts the function is activated, e.g., 15 minutes.
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
SpTDiffStepDn | Temperature difference setpoint for step down | ACnfVal: Analog configuration value | N/A | No | |