User Manual
Table Of Contents
- 1. About this document
- 2. Summary
- 3. Functions
- 3.1 Temperature control
- 3.2 Operating modes
- 3.3 Room temperature setpoint
- 3.4 Applications overview
- 3.5 Additional functions
- 3.6 Control sequences
- 3.7 Control outputs
- 3.8 Fan control
- 3.9 Multifunctional input, digital input
- 3.10 Handling faults
- 3.11 Modbus RTU mode
- 3.12 Communication objects
- 3.13 Control parameters
- 4. Handling
- 5. Connection
- 6. Mechanical design
- 7. Technical data
58 / 66
Siemens RDF302 Basic documentation CE1P3079en
Smart Infrastructure 2020-12-01
5. Connection
5.1 Connection terminals
L, N Operating voltage AC 230 V
Q1 Control output “Fan speed 1 AC 230 V”
Q2 Control output “Fan speed 2 AC 230 V”
Q3 Control output “Fan speed 3 AC 230 V”
Y11,Y21 Control output “Valve” AC 230 V (N.O., for normally
closed valves), output for compressor or output for
electrical heater
X1, X2
1)
Multifunctional input for temperature sensor (e.g.
QAH11.1) or potential-free switch
Factory setting:
X1 = Operating mode switchover contact
X2 = External sensor
(function can be selected via parameter P38/P40).
M
1)
Measuring neutral for sensor and switch
+ RS485 Modbus connection
- RS485 Modbus connection
REF RS485 signal/common ground
(Differential common)
1)
RDF302.B does not have inputs X1, X2 and M.