Basic Documentation
Table Of Contents
- 1 About this document
- 2 Overview
- 3 Notes
- 4 Functions
- 4.1 Temperature control
- 4.2 Operating modes
- 4.3 Room temperature setpoint
- 4.4 Application overview
- 4.5 Additional functions
- 4.6 Control sequences
- 4.7 Control outputs
- 4.8 Fan control
- 4.9 Multifunctional input, digital input
- 4.10 Handling system faults
- 4.11 Modbus RTU mode
- 4.12 Communication objects
- 4.13 Control parameters
- 5 Connection
- 6 Technical data
- 7 Dimensions
- Index
Functions
Fan control
4
A6V12114068_en--_c
39 | 66
4.7.2 Control output configuration (setting via DIP switches
or Modbus commissioning tool)
For the control outputs of a 2-pipe application, either On/Off or 3-position can be
set via DIP switches or Modbus commissioning tool (see Application overview
[➙ 22]). Other applications, e.g. 4-pipe and 2-pipe with electric heater (RDF660MB
only), only have On/Off type of outputs.
The application and control output can be changed between On/Off and 3-position
via Modbus.
4.8 Fan control
The fan is in automatic mode or runs at the selected speed in manual mode.
In automatic mode, the fan speed is based on the setpoint and the current room
temperature. When the room temperature reaches the setpoint, the control valve
closes and the fan switches off or remains at low speed (parameter P15, factory
setting: 0 = disabled).
Both fan speed and mode can be changed via Modbus.
Fan speed and mode can be monitored via Modbus.
Plant type
Fan command value
Fan operation
Fan output