Samson TROVIS 5432 Mounting And Operating Instructions

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Samson TROVIS 5432 Mounting And Operating Instructions Manual pdf 33 page image

7.4 Limiting the return flow temperatureThe temperature difference between the flow and return flow in a network indicates how wellthe energy is used: the greater the difference, the higher the efficiency. A return flow sensoris sufficient to evaluate the temperature difference when the network flow temperatures arepredetermined. The flow temperature set point is reduced when the return flow temperaturemeasured at the return flow sensor S3 exceeds the limit temperature. As a result, the primaryflow rate is reduced and the return flow temperature falls. A PI algorithm is used to limit thereturn flow temperature. The integral action cannot be parameterized.Parameter WE Level / Range of valuesMaximum return flow temperature 50 °C CoPa level P5 / 20 to 90 °CK P Return flow temperature limit 1.0 CoPa level P8 / 0.1 to 50.07.5 Three-step controlThe flow temperature can be controlled with a PI algorithm. The motorized valve reacts topulses which the controller issues when a system deviation arises. In particular, the length ofthe first pulse depends on the size of the system deviation and the selectedK P Proportionalgain (the impulse length increases as the K P increases). The intervals between each pulse andthe interval length between pulses change continuously until the system deviation has beeneliminated.The interval length between each pulse is greatly influenced by theReset time T N (the intervallength increases as T N increases). TheValve transit time TY specifies the time required by thevalve to travel through the range from 0 to 100 %.Functions WE ConfigurationControl signal 1 F4 - 1Parameter WE Level / Range of valuesK P (proportional gain) 2.0 CoPa level P10 / 0.1 to 50.0TN (reset time) 120 s CoPa level P11 / 0 to 999 sTY (valve transit time) 45 s CoPa level P12 / 10 to 240 sEB 5432 EN 33System-wide functions