Danfoss VLT HVAC Drive FC 102 Manuel d'instructions d'installation - Page 9

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Installation Instructions

Application Integration

PTU 025 is designed for central air handling units with 1 or more filters in the inlet/outlet part and with fan control based on the

airflow or pressure level in the ventilation system. Separate frequency converters with separate pressure transmitter units control

the inlet and outlet. PTU 025 has 4 pressure inputs. See the pressure ranges in Table 1.4. Sensors 3 and 4 can be configured for

either filter monitoring or PID control of the airflow or the pressure level.

Illustration 1.10 Application Integration Example

Range

0–500 Pa

0–1000 Pa

0–2500 Pa

Table 1.4 PTU 025 Sensors and their Functions

Integrating pressure signals into a system solution

The pressure values can be read as analog values on the

analog output or as pulses on digital outputs. Use

parameter 5-30 Terminal 27 Digital Output,

parameter 5-31 Terminal 29 Digital Output, and

parameter 5-40 Function Relay to send the sensor status to the

relay or digital outputs. For more information about using the

pressure values in applications and in the smart logic control,

see the programming guide.

MI08A102

Pressure Transmitter Unit PTU 025

VLT

HVAC Drive FC 102

Typical function

Filter monitoring

Filter monitoring or PID control of the airflow or the pressure level

PID closed-loop control based on the airflow or pressure

level

Use parameters in parameter group 20-0* Feedback to use the

pressure values for the frequency converter's closed-loop PID

controller.

Use parameters in parameter group 22-** Application Functions

to configure the monitoring of HVAC applications based on

airflow. For more information, see the operating guide and the

programming guide.