Siemens RDF302 Documentation
  1. Manuals
  2. Brands
  3. Siemens Manuals
  4. Thermostat
  5. RDF302
  6. Documentation

Siemens RDF302 Documentation

Semi-flush mount room thermostats with rs485 modbus communications
Hide thumbs Also See for RDF302:
Table of Contents

Advertisement

Quick Links

See also: Operating Instructions
s
RDF302
Semi-flush mount room thermostats with RS485
Modbus communications
RDF302
Basic Documentation
Edition 1.0
CE1P3079en
07 Dec 2011
Building Technologies

Advertisement

Table of Contents
loading

Related Manuals for Siemens RDF302

Summary of Contents for Siemens RDF302

  • Page 1 RDF302 Semi-flush mount room thermostats with RS485 Modbus communications RDF302 Basic Documentation Edition 1.0 CE1P3079en Building Technologies 07 Dec 2011...

  • Page 2: Table Of Contents

    Multifunctional input, digital input ............35 3.10 Handling faults..................36 3.11 Modbus RTU mode .................37 3.11.1 Fault function on Modbus................37 3.12 Communication objects................38 3.12.1 Overview ....................38 3.12.2 Description of communication objects ............39 2 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Contents 07 Dec 20111...
  • Page 3 Mounting and installation ................47 Commissioning..................48 Operation ....................49 Disposal ....................50 Connection ....................51 Connection terminals ................51 Connection diagrams ................52 Mechanical design ................53 General ....................53 Dimensions .....................54 Technical data ..................55 Index ........................57 3/58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Contents 07 Dec 20111...

  • Page 4: About This Document

    Pages 07,12.2011 First edition Reference documents Subject Doc No. Description Modbus Manual MODBUS over serial line specification and implementation guide (http://www.modbus.org) RDF302 Room Thermostat CB1N3079 Data Sheet with Modbus Interface CB1B3079 Operating Instructions CB1M3079 Installation Instructions SEZ50MB (RWD Modbus) CB1N3099...

  • Page 5: Before You Start

    Before you start 1.3.1 Copyright This document may be duplicated and distributed only with the express permission of Siemens, and may be passed only to authorized persons or companies with the required technical knowledge. 1.3.2 Quality assurance This document was prepared with great care.

  • Page 6: Target Audience, Prerequisites

    RDF302 room thermostats in the RS485 Modbus RTU network. Since Modbus protocol has been well known for years in the industry, this document will explain the operations related to RDF302 Modbus units. e.g. the unit setup, available settings and their applications. And, users should have the general knowledge of HVAC systems and local electrical installation regulations where RDF302 units are employed.

  • Page 7: Summary

     Backlit display  AC 230 V operating voltage  Room temperature control via built-in temperature sensor or external room Functions temperature / return air temperature sensor 7 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Summary 07 Dec 20111...

  • Page 8: Integration Via Modbus

     RS 485 Modbus (terminals +, - and REF) for communication with Modbus compatible devices Integration via Modbus The RDF302 is a communicative thermostat with Modbus open protocol on RTU (Remote Terminal Unit) mode enabling easy integration into BACS via RS-485. The following Modbus functions are available: ...

  • Page 9: Equipment Combinations

    Plastic mounting bracket for semi-flush-mount thermostats for increasing the headroom in the ARG70.3 N3009 conduit box by 10mm ARG71 / N3009 Conduit box for semi-flush mounted thermostat S55770-T137 9 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Summary 07 Dec 20111...

  • Page 10: Functions

    P07 = 3 or 4. The display format is either in 12- or in 24-hour format. Time of day The information can be received from a master device in the Modbus network. 10 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 11: Operating Modes

    – protected against overheating (factory setting OFF, can be enabled or changed via P66) No other operating mode can be selected locally if Protection mode is commanded via Modbus. is displayed. 11 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 12: Different Ways To Influence The Operating Mode

    Note: Only one input source must be used, either local input X1/X2 or Modbus. User operations are ineffective and “OFF” is displayed if the operating mode switchover contact is active, or if "WindowContact" is sent via Modbus. 12 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 13: Room Temperature Setpoint

    Use control parameters P65 and P66 to adjust the Protection mode setpoints. Protection mode The heating setpoint is factory-set to 8 °C (frost protection) and to OFF for cooling. 13 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 14: Setting And Adjusting Setpoints

    The current setpoint (used by the thermostat for temperature control) is available Room temperature: on the Modbus for use in the central control unit. Current setpoint 14 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...
  • Page 15 Protection setpoint is OFF, then minimum 5 °C and maximum 40 °C are used  The resulting setpoints for cooling and heating of the same operating mode have a minimum distance of 0.5 K between them 15 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 16: Applications Overview

    All DIP switches need to be set to OFF (remote configuration, factory setting) to select an application via Modbus commissioning tool. The RDF302 offers the applications printed in bold text (basic applications). For universal applications (chilled ceiling, etc.), refer to section 3.6.5.
  • Page 17 M1 3- or 1-speed fan actuator Y2 Cooling valve actuator B1 Return air temperature sensor or external room temperature sensor (optional) E1 Electric heater B2 Changeover sensor (optional) 17 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 18: Additional Functions

     If manual heating / cooling changeover is commissioned (P01 = 2), then heating / cooling mode cannot be changed via changeover sensor / switch; it will remain in the last mode as selected locally via button. 18 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...
  • Page 19 Up to 26 °C for long-time presence, up to 28 °C for short-time presence. Bath rooms: Up to 28 °C for long-time presence, up to 30 °C for short-time presence. 19 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...
  • Page 20 B = Lock operating mode button only C = Lock fan button only D = Lock temperature adjusting buttons (+ & -) only. E = Unlock 20 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 21: Control Sequences

    / cooling sensor or remote switch ("main and secondary" application), see section 3.6.4 For the relation between setpoints and sequences, see section 3.6.7. 21 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Functions 07 Dec 20111...

  • Page 22: 2-Pipe Fan Coil Unit

    Note: The diagrams only show the PI thermostat’s proportional part. Setting the sequence and the control outputs Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs". 22 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 23: 2-Pipe Fan Coil Unit With Electric Heater

    If “Enable electric heater” input is used via Modbus, then the function must not be assigned to a local input X1 or X2. Caution An electric heater must always be protected by a safety limit thermostat! 23 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 24 Note: The diagrams only show the PI thermostat’s proportional part. Setting the sequence and the control outputs Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs". 24 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 25: 4-Pipe Fan Coil Unit

     The thermostat assumes winter operation when B2 > P37 (factory setting 28 °C)  The thermostat assumes summer operation when B2 < P36 (factory setting 16 °C) 25 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 26 The diagrams only show the PI thermostat’s proportional part. Note: Setting the sequence and the control outputs Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs". 26 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 27: Chilled / Heated Ceiling And Radiator Applications

     Minimum ON/OFF time: Notes: P48 / P49  Fan operation: P52 (0 = disabled, 1 = enabled)  Fan speed: P53 (1 = 1-speed, 2 = 3-speed) 27 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 28: Setpoints And Sequences

    = setpoint heating in Economy or Protection mode HeatEco/Prot = setpoint cooling in Economy or Protection mode CoolEco/Prot YR = radiator sequence YE = electric heater sequence 28 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 29 W = setpoint in Comfort mode = heating setpoint for Economy or Protection mode HeatEco/Prot = cooling setpoint for Economy or Protection mode CoolEco/Prot YE = electric heater sequence 29 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 30: Control Outputs

    3. After the actuator reaches the position calculated by the thermostat, a waiting time of 30 seconds is applied to stabilize the outputs. 30 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 31: Control Outputs Configuration (Setting Via Dip Switches Or Modbus Commissioning Tool)

    4-pipe and 2-pipe with electric heater, only have On/Off type of outputs. The application and control output can be changed between On/Off and 3-position Plant type via Modbus. 31 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 32: Fan Control

    Switching differential “Heating” Switching differential “Cooling” Dead zone Cool Switching range for fan “Heating” Switching range for fan “Cooling” T[°C] SDH/SDC >4.5 Look-up table with /XpC ON/OFF control 32 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 33 When the fan starts from standstill, it starts at speed 3 for 1 second to ensure safe fan motor start by overcoming inertia and friction (selected via parameter P58). 1 sec 33 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 34 The “Clean fan filter reminder” is reset when the operating mode is manually set to Protection and back. The ‘Clean fan filter reminder’ and error information (see 3.11.1) can be obtained Fault information via Modbus object: Fault information 34 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 35: Multifunctional Input, Digital Input

    X1, X2. See also section 3.2. Dew point monitor Digital input for a dew point sensor to detect condensation. Cooling is stopped if condensation occurs. 35 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 36: Handling Faults

    For all other cases, no output is activated. The thermostat resumes Comfort mode after the temperature returns to within the measuring range. For fault status messages on the Modbus, see section 3.11.1. Fault information 36 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 37: Modbus Rtu Mode

    3.11 Modbus RTU mode The RDF302 thermostats support communication protocol (Modbus RTU mode) as per the Modbus specification. (refer to: http://www.modbus.org) Device address The device address range is from 1 to 247. The device address can be changed via parameter P81. (factory setting = 1) Baud rate The available baud rates are 4800 bps, 9600 bps, 19200bps and 38400 bps.

  • Page 38: Communication Objects

    P01 must be set to 2, the manual heating/cooling changeover Either using local input, X1/X2 input, or Modbus command 3 way DipSwitch must be set to OFF-OFF-OFF 38 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 39: Description Of Communication Objects

    3.12.2 Description of communication objects 39 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 40 40 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 41 41 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 42 {0,1} Standard 1 : Time = UT+X+1 Summer Time 0 : clock without ext. sync signal {0,1} Quality of 1 : clock with ext. sync signal Clock 42 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 43: Control Parameters

    3.13.2 Parameter setting / download via Modbus communicatin tool Control parameters can be adjusted via Modbus either by local HMI or Modbus commissioning tools. Please refer to section 4.2 for commissioning. 43 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 44: Parameters Of The "Service Level

    2 = Manual lock Note: Parameter P13 and P54 is only displayed for application "2-pipe with electric heater". All temperature settings are in increments of 0.5 °C. 44 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 45: Parameters Of The "Expert Level With Diagnostics And Test

    Fan speed switching point low 1...15% Fan start kick ON: Enabled OFF: Disabled Fan minimum on time 2 min 1...6 min Periodic fan kick Comfort 0…89 min, OFF(90) 45 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 46 Press buttons + and – simultaneously to escape. actuator's running direction Parameters d05 will only appear when the application (DIP switch) set to 2 pipe 3 position. 46 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 47: Handling

     Isolate the cables of Modbus communication input +, - and REF for 230 V.  No metal conduits  No cables provided with a metal sheath  Disconnect from supply before opening the cover 47 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 48: Commissioning

     We recommend to review the setpoints and setpoint ranges (parameters Setpoint and range limitation P08…P12) and change them as needed to achieve maximum comfort and save energy 48 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 49: Operation

    + again >3 seconds level” Press + and – >3 seconds, release, Go to parameter setting mode “Expert then press – again >3 seconds level”, diagnostics and test 49 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 50: Disposal

    The relevant national legal rules must be adhered to. Regarding disposal, use the systems setup for collecting electronic waste. Observe all local and applicable laws. 50 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 51: Connection

    X2 = External sensor (function can be selected via parameter P38/P40). Measuring neutral for sensor and switch RS485 Modbus connection RS485 Modbus connection RS485 signal/common ground (Differential common) 51 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 52: Connection Diagrams

    Connection diagrams Application Room thermostat RDF302 1-speed or 3-speed fan 10 A Valve actuator, 2-pos or 3-pos Y1, Y2 Valve actuator, 2-pos Electric heater CE+ CE- 1-stage compressor Q1 Q2 Q3 External fuse I II III S1, S2 Switch (keycard, window contact, 2-pipe, 2-position presence detector, etc.)

  • Page 53: Mechanical Design

    Slide the front panel in the mounting base and snap on. Operation and settings RDF302 1. Operating mode selector 2. Change fan operation 3. Adjust setpoints and control parameters For operation, refer to section 4.3. 53 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 54: Dimensions

    Dimensions Dimensions in mm 54 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 55: Technical Data

    < ± 0.5 K Accuracy at 25 °C ± 3.0 K Temperature calibration range Settings and display resolution 0.5 °C Setpoints 0.5 °C Current temperature value displayed 55 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...
  • Page 56 (Note: For sensors on inputs X1 and X2, the cable length is max. 80 m.) Housing front color RAL 9003 white Weight without / with packaging 0.174 kg/0.261 kg 56 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies 07 Dec 2011...

  • Page 57: Index

    Switching differential ..........10 Fan start..............33 Synchronization.............30 Fault..............36 Fault on KNX ............37 Fault, handling ............36 Temperature out of range........36 Floor cooling ............19 Temporary setpoint..........13 57 / 58 Siemens RDF302 Basic documentation CE1P3079en Building Technologies Index 07 Dec 2011...
  • Page 58 Infrastructure & Cities Sector Building Technologies Division International Headquarters Gubelstrasse 22 CH-6301 Zug Tel. +41 41-724 24 24 Fax +41 41-724 35 22 © 2011 Siemens Switzerland Ltd www.buildingtechnologies.siemens.com Subject to change 58 / 58 Siemens RDF302 Basic documentation CE1P3079en...

Table of Contents