Danfoss PTU 025 Installation Instructions Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

Contents

Application IntegrationPTU 025 is designed for central air handling units with 1 or more filters in the inlet/outlet part and with fan control based on theairflow or pressure level in the ventilation system. Separate frequency converters with separate pressure transmitter units controlthe inlet and outlet. PTU 025 has 4 pressure inputs. See the pressure ranges in Table 1.4. Sensors 3 and 4 can be configured foreither filter monitoring or PID control of the airflow or the pressure level.Illustration 1.10 Application Integration Example# Range Typical function1 0–500 Pa Filter monitoring2 0–500 Pa Filter monitoring3 0–1000 Pa Filter monitoring or PID control of the airflow or the pressure level4 0–2500 Pa Filter monitoring or PID control of the airflow or the pressure levelTable 1.4 PTU 025 Sensors and their FunctionsIntegrating pressure signals into a system solutionThe pressure values can be read as analog values on theanalog output or as pulses on digital outputs. Useparameter 5-30 Terminal 27 Digital Output,parameter 5-31 Terminal 29 Digital Output, andparameter 5-40 Function Relay to send the sensor status to therelay or digital outputs. For more information about using thepressure values in applications and in the smart logic control,see the programming guide.PID closed-loop control based on the airflow or pressurelevelUse parameters in parameter group 20-0* Feedback to use thepressure values for the frequency converter’s closed-loop PIDcontroller.Use parameters in parameter group 22-** Application Functionsto configure the monitoring of HVAC applications based onairflow. For more information, see the operating guide and theprogramming guide.Installation Instructions Pressure Transmitter Unit PTU 025VLT® HVAC Drive FC 102MI08A102 Danfoss A/S © 12/2017 All rights reserved. 9

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