Theben RAM 712 KNX Manual
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Theben RAM 712 KNX Manual

Room thermostat for surface-mounted and flush-mounted installation
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theben
RAM 712 KNX
room thermostat for surface-mounted and flush-mounted installation
RAM 712 KNX room thermostat for
surface-mounted
and flush-mounted installation
RAM 712
712 9 200
Version: Dec-10 (subject to change)
Page 1 of 65

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Summary of Contents for Theben RAM 712 KNX

  • Page 1 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation RAM 712 712 9 200 Version: Dec-10 (subject to change) Page 1 of 65...

  • Page 2: Table Of Contents

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Contents Functional characteristics ......................4 Operation .......................... 5 Benefits of RAM 712 ....................... 5 1.2.1 Special features ......................5 Technical data .......................... 6 General ..........................6 RAM 712 V1.0 application program ..................7 Selection in the product database ..................
  • Page 3 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.5.2 External sensor ......................58 6.5.3 Suitable actuators ....................... 58 Temperature control ....................... 59 6.6.1 Introduction ........................ 59 6.6.2 Response of the P-control ..................60 6.6.3 Response of the PI control ..................61 Glossary ..........................

  • Page 4: Functional Characteristics

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 1 Functional characteristics The RAM 712 room thermostat is a KNX controller for heating and cooling operation with 2 binary inputs (see appendix: External interface) that can be controlled both continuously and in 2 point operating mode.

  • Page 5: Operation

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 1.1 Operation RAM 712 has no control elements. All parameters are preset via ETS. Operating mode and setpoint value specification can be controlled via the bus; Object characteristics. 1.2 Benefits of RAM 712 •...

  • Page 6: Technical Data

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 2 Technical data 2.1 General Power supply: Bus voltage. Permitted operating temperature: -5 °C ... + 45°C Current draw from bus voltage: Max 10 mA Bus connection: Bus terminal...

  • Page 7: Ram 712 V1.0 Application Program

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3 RAM 712 V1.0 application program 3.1 Selection in the product database Manufacturer Theben AG Heating, ventilation, air conditioning Product family Continuous and 2 point controller Product type Program name...

  • Page 8: Communication Objects

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.3 Communication objects 3.3.1 Object characteristics RAM 712 features 18 communication objects. Some objects can assume various functions depending on their configuration. Table 2 Flags Function Object name Type...
  • Page 9 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Flags Function Object name Type C R W T 1 bit     Switching ON/OFF Input 1 switching EIS 1 2 bit Priority Input 1 priority...
  • Page 10 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Flags Function Object name Type C R W T 1 bit     Switching ON/OFF Input 2 switching EIS 1 2 bit Priority Input 2 priority...

  • Page 11: Description Of Objects

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.3.2 Description of objects • Objekt 0 "Base setpoint value" base setpoint value is first specified at start-up and stored in the base setpoint value. It can be reset at any time using object 0 (limited by minimum or maximum valid setpoint value).
  • Page 12 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation • Object 3 "Operating mode preset"/ "night < - > standby" The function of this object depends on the objects for setting operating mode on the operating mode parameter page.
  • Page 13 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation • Object 5 "Window position" / "frost/heat protection" The function of this object depends on the objects for setting operating mode parameter on operating mode parameter page. Table 6...
  • Page 14 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation • Object 7 "Heating control variable” / “heating and cooling control variable" Sends the current heating actuating value (0...100%) or heating or cooling if the output of cooling actuating value parameter has been set to together with heating actuating value.
  • Page 15 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation • Objects 11, 14 "Switching ON/OFF, priority, send value, temperature value, call/store light scene, send, step / stop, height position , switching LED " To use inputs E1 and E2 the external interface must be configured on the settings, parameter page as active .
  • Page 16 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation • Objects 13, 16 "Lock" Inputs E1 or E2 are locked via this object. The resulting response can be set individually on the parameter pages. 1 = disabled 0 = cancel lock •...

  • Page 17: Parameters

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4 Parameters The standard values are in bold. 3.4.1 Settings Table 10 Designation Values Application Control For simple applications Standard User-defined Enables selection of control functions Control functions used...

  • Page 18: Heating Control

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.2 Heating control Table 11 Designation Values Application Type of control Infinite control Continuous control (0 .. 100%). 2-point control Switching control (On/Off). See appendix: Continuous and switching control...
  • Page 19 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Application 2-point control Hysteresis of 2 point control 0.3 K, 0.5 K, 0.7 K Interval between the switch- 1 K, 1.5 K, 2 K off point (setpoint value) and...

  • Page 20: Setpoint Values

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.3 Setpoint values Table 12 Designation Values Application Base setpoint value after 18 °C, 19 °C, 20 °C, Output setpoint value for loading application 21 °C, 22 °C, 23 °C, temperature control.
  • Page 21 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Application Current setpoint value in Feedback of current setpoint comfort mode value via the bus: Sends actual value (heating The setpoint value actually being controlled is always <...
  • Page 22 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Application LIMITS Maximum valid setpoint +/- 1 K, +/- 2 K, +/- 3 K, Limits the possible setting value offset +/- 4 K, +/- 5 K range for the setpoint offset function.

  • Page 23: Actual Value

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.4 Actual value Table 13 Designation Values Application Calibration value Manual input – 64 ... 63 Positive or negative In 1/10 K (-64 .. 63) adjustment of measured temperature in 1/10 K increments.

  • Page 24: Cooling Control

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.5 Cooling control Table 14 Designation Values Application Type of control Infinite control Continuous control (0 .. 100%). 2-point control Switching control (On/Off). See appendix: Continuous and switching control...
  • Page 25 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation Designation Values Application User-defined control parameters Proportional band of the 1 K, 1.5 K, 2 K, 2.5 K, 3 K Professional setting for cooling control 3.5 K, 4 K, 4.5 K adapting controlresponse to 5 K, 5.5 K, 6 K...
  • Page 26 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation Designation Values Application Switchover between heating Automatic RAM 712 automatically and cooling switches to cooling mode when the actual temperature is above the set point value. Via object...

  • Page 27: Operating Mode

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.6 Operating mode Table 15 Designation Values Application Objects for determining the RAM 712 can switch the Operating mode, presence, operating mode window status operating mode depending on the window and presence contacts.
  • Page 28 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation Designation Values Application Comfort extension by None Telegrams from presence key presence keys in night mode* are not considered. 30 minutes. Party switching: 1 hour This allows Ram 712 to 1.5 hours...

  • Page 29: Cooling Setpoint Values

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.7 Cooling setpoint values This page is only displayed only if the “heating and cooling” control function has been selected on the settings parameter page (user-defined control). Table 16...

  • Page 30: Inputs E1, E2

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.8 Inputs E1, E2 3.4.8.1 The “switch / key” function An input is connected to a key or a switch. When this is pressed, then a switching, value, priority or temperature value telegram is sent to the bus.
  • Page 31 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description For switching object type: How should the channel respond when an input voltage is applied? None Ignore On Send ON telegram Off Send OFF telegram By Reverse channel status (cf.
  • Page 32 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description For temperature value object type. Temperature value Do not send temperature No response. with a rising edge value. 0 °C .. 40 °C in 1 °C Send temperature value.
  • Page 33 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description Response after None No response. restoration of the bus supply Update The current status of the channel is sent. Same as after rising edge Response configured as for rising edge.
  • Page 34 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.8.2 The “dimming” function With Single key operation one input is connected to a simple key. With other operating modes 2 inputs and 2 keys are required per dimmer channel. Consequently, both inputs must be connected via common group addresses.
  • Page 35 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description Darker/OFF Short keystroke = OFF Long keystroke = darker Response to Release = stop “long” / “short” Darker/BY Short keystroke = ON/OFF (continuation) Long keystroke = darker...
  • Page 36 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.8.3 “Blinds” function With single key operation one input is connected to a simple key. With other operating modes 2 inputs and 2 keys are required per set of blinds. Consequently, both inputs must be connected via common group addresses.
  • Page 37 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description Reaction when setting Ignore lock Disable telegrams are ignored the lock No reaction when setting the Only respond when the lock is lock cancelled UP Send move up command*...
  • Page 38 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 3.4.8.4 “Valuator” function Basic functionality: Pressing the connected key triggers a value telegram. Depending on the configuration, two different telegrams can also be sent (“long/short” function). Table 21 Designation...
  • Page 39 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description Parameter for value for light scene type of value Scene number Scene 1 Sends the selected scene number (call scene) Scene 64 Save when long time...
  • Page 40 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation Continuation: Designation Values Description Response after None No response after restoration of the restoration of the bus bus supply. supply As with short keystroke, send Same telegram as configured for immediately short keystroke Send without delay.

  • Page 41: Start-Up

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 4 Start-up 4.1 Installation in a flush-mounted socket The controller and circuit board are fixed with a release fastener and can simply released from the white housing for installation in a flush-mounted socket.

  • Page 42: Actuators To Control Heating And Cooling

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 4.2 Actuators to control heating and cooling There are several possibilities available for controlling the heating and cooling equipment. 4.2.1 Heating control variable • The control variable is sent to a continuous Cheops actuating drive (order no.

  • Page 43: Typical Applications

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 5 Typical applications: 5.1 The school environment: Heating with presence detector and frost protection via window contact. 5.1.1 Description RAM 712 controls one or more actuators. Once someone enters the room the RAM 712 changes to comfort mode, otherwise it operates in standby mode during the day and in night time mode at night.

  • Page 44: Overview

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 5.1.3 Overview Obj. 9 Obj. 4 Obj.11 Obj. 5 Obj. 7 Obj. 0 Obj. 3 Obj. 0 Figure 1 Version: Dec-10 (subject to change) Page 44 of 65...

  • Page 45: Objects And Links

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 5.1.4 Objects and links Table 22: RAM 712  Cheops drive RAM 712 Cheops drive Comments Object name Object name Actuator receives heating Heating control Control variable actuating value and moves the...

  • Page 46: Important Parameter Settings

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 5.1.5 Important parameter settings Standard or user-defined parameter settings apply for unlisted parameters. 5.1.5.1 RAM 712 Table 26 Parameter page Parameters Setting Settings Control Standard Function of the external interface...
  • Page 47 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 5.1.5.3 Compact office EIB Table 28 Parameter page Parameters Setting General information Operating mode Master in individual switching mode Presence output Active Normal or test operating mode Normal operation...

  • Page 48: Appendix

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6 Appendix 6.1 Determining the current operating mode current setpoint value can be adapted to to relevant requirements by selecting the operating mode. The operating mode can be specified by objects 3..5.

  • Page 49: Old Operating Modes

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.1.2 Old operating modes If old is selected in the determining operating mode parameter on the operating mode parameter page, the current operating mode can be defined as follows:...

  • Page 50: Determining The Setpoint Value

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.1.3 Determining the setpoint value 6.1.3.1 Calculating the setpoint value in heating operation See: Base setpoint value and current setpoint value Table 31: Current setpoint value during heating Operating mode...
  • Page 51 RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.1.3.2 Calculating the setpoint value in cooling operation Table 32: Current setpoint value during cooling Operating Current setpoint value mode Comfort Baseset point value + setpoint value offset + dead zone...

  • Page 52: Setpoint Offset

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.2 Setpoint offset current setpoint value can be adjusted in the RAM 712 via object 1 manual setpoint value offset. In this case, the setpoint value is changed by sending the desired offset to object 1.

  • Page 53: Base Setpoint Value And Current Setpoint Value

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.3 Base setpoint value and current setpoint value The base setpoint value is the standard temperature for comfort mode and the reference temperature for reduction in standby and night modes.

  • Page 54: The Scenes

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.4 The scenes 6.4.1 Principle The current operating mode can be saved with the scene functions and restored later at any time. The current operating mode is allocated to the appropriate scene number when a scene is saved.

  • Page 55: Saving Scenes

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.4.2 Saving scenes: The appropriate storage code is sent to object 17 to save a scene. Table 33 Storage code Storage code Scene Scene Example: Save current operating mode with scene 5: →...

  • Page 56: Calling Scenes

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.4.3 Calling scenes: The appropriate retrieval code is sent to object 17 to call a scene. Table 34 Retrieval code Retrieval code Scene Scene Example: Call operating mode with scene 5: →...

  • Page 57: External Interface

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.5 External interface The external interface is activated on the Settings parameter page. It consists of 2 binary outputs: E1 and E2. The status of the inputs can be transmitted on the bus.

  • Page 58: External Sensor

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.5.2 External sensor The temperature sensor fitted on the circuit board can be replaced by a remote sensor (order no. 907 0 321) if required. The temperature calibration is entered on the actual value parameter page.

  • Page 59: Temperature Control

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.6 Temperature control 6.6.1 Introduction If the RAM 712 is not configured as a switching controller, it can alternatively be configured as a P or as a PI controller, whereby PI control is preferable.

  • Page 60: Response Of The P-Control

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 6.6.2 Response of the P-control Max. 4l/Min. Sollwert Bandbreite Istwert Verluste 1l/Min A filling volume of 15l gives rise to a control deviation of 211 – 151 = 61 As our actual value lies outside the bandwidth, the control will operate the flow rate at 100% i.e.

  • Page 61: Response Of The Pi Control

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation P-control as temperature control The P-control response during heating control is as shown in the previous example. The setpoint temperature (21°C) can never quite be reached. The permanent control deviation increases as the heat loss increases and decreases as the ambient temperature decreases.

  • Page 62: Glossary

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 7 Glossary 7.1 Continuous and switching control A switching (2 point) control recognises only 2 statuses, On or Off. A continuous control works with a control variable between 0% and 100% and can thus exactly measure out the energy input.

  • Page 63: Positive Hysteresis

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 7.2.2 Positive hysteresis Heating lasts until the temperature reaches "setpoint value + hysteresis" threshold has been achieved. The heating is only switched on again when the temperature falls below the setpoint value.

  • Page 64: Case 2: Heating With 2-Point Control And Cooling With Continuous Control

    RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation 7.3.2 Case 2: Heating with 2-point control and cooling with continuous control Cooling setpoint value 25 °C DEAD ZONE 4 K Heating hysteresis 1 K Heating setpoint value 20 °C The dead zone (4 K) is increased by the value of the hysteresis (1K) and offsets the cooling setpoint value to 25 °C.

  • Page 65: Setpoint Value Calculation

    Continuous room thermostat RAM 712 7.3.5 Setpoint value calculation Operation mode Comfort - Standby Base setpoint Manual - Night Heating mode limitations setpoint Safety offset limitations Frost prot. Actual Base setpoint + / - setpoint Komfort Cooling mode + Standby...

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