Theben RAM 712 KNX User manual

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

RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation
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Version: Dec-10 (subject to change) Page 2 of 65
Contents
1Functional characteristics.........................................................................................................4
1.1 Operation..........................................................................................................................5
1.2 Benefits of RAM 712.......................................................................................................5
1.2.1 Special features ............................................................................................................5
2Technical data ..........................................................................................................................6
2.1 General .............................................................................................................................6
3RAM 712 V1.0 application program.......................................................................................7
3.1 Selection in the product database.....................................................................................7
3.2 Parameter pages................................................................................................................7
3.3 Communication objects....................................................................................................8
3.3.1 Object characteristics ...................................................................................................8
3.3.2 Description of objects.................................................................................................11
3.4 Parameters......................................................................................................................17
3.4.1 Settings.......................................................................................................................17
3.4.2 Heating control...........................................................................................................18
3.4.3 Setpoint values ...........................................................................................................20
3.4.4 Actual value................................................................................................................23
3.4.5 Cooling control...........................................................................................................24
3.4.6 Operating mode..........................................................................................................27
3.4.7 Cooling setpoint values..............................................................................................29
3.4.8 Inputs E1, E2..............................................................................................................30
4Start-up...................................................................................................................................41
4.1 Installation in a flush-mounted socket ...........................................................................41
4.2 Actuators to control heating and cooling .......................................................................42
4.2.1 Heating control variable.............................................................................................42
4.2.2 Cooling control variable.............................................................................................42
5Typical applications:..............................................................................................................43
5.1 The school environment: Heating with presence detector and frost protection via
window contact. .........................................................................................................................43
5.1.1 Description.................................................................................................................43
5.1.2 Devices:......................................................................................................................43
5.1.3 Overview....................................................................................................................44
5.1.4 Objects and links........................................................................................................45
5.1.5 Important parameter settings......................................................................................46
6Appendix................................................................................................................................48
6.1 Determining the current operating mode .......................................................................48
6.1.1 New operating modes.................................................................................................48
6.1.2 Old operating modes ..................................................................................................49
6.1.3 Determining the setpoint value ..................................................................................50
6.2 Setpoint offset ................................................................................................................52
6.3 Base setpoint value and current setpoint value ..............................................................53
6.4 The scenes ......................................................................................................................54
6.4.1 Principle .....................................................................................................................54
6.4.2 Saving scenes: ............................................................................................................55
6.4.3 Calling scenes:............................................................................................................56
6.5 External interface ...........................................................................................................57
6.5.1 Circuit board...............................................................................................................57

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Version: Dec-10 (subject to change) Page 3 of 65
6.5.2 External sensor...........................................................................................................58
6.5.3 Suitable actuators .......................................................................................................58
6.6 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
7Glossary..................................................................................................................................62
7.1 Continuous and switching control..................................................................................62
7.2 Hysteresis.......................................................................................................................62
7.2.1 Negative hysteresis:....................................................................................................62
7.2.2 Positive hysteresis......................................................................................................63
7.3 Dead zone.......................................................................................................................63
7.3.1 Case 1: Heating and cooling with continuous control................................................63
7.3.2 Case 2: Heating with 2-point control and cooling with continuous control...............64
7.3.3 Case 3: Heating with continuous control and cooling with 2-point control...............64
7.3.4 Case 4: Heating and cooling with 2-point control......................................................64
7.3.5 Setpoint value calculation ..........................................................................................65

RAM 712 KNX room thermostat for surface-mounted and flush-mounted installation
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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.
It measures the current room temperature (actual value) via a sensor and sends either
a continuous control variable (0...100%) or a switching command (On/Off) to an actuator or
heating actuator to achieve the desired room temperature (setpoint value).
This device is primarily ideal for use in public buildings, including schools for example, thanks to
its elegant design, the absence of control elements, its robust structure and its excellent price
performance ratio.
The option of installing the device in a flush-mounted socket allows it to be integrated in
switching programmes of choice.
Using the binary inputs, switches and keys (floating) can be connected to switch, dim and control
blinds.
The blinds and dimmer channels can also be controlled with a single key (single key operation).
Possible actuators include: Cheops drive, HMG 4, HMT 6, HMT 12
The RAM 712 has four operating modes that allow setpoint values to be easily adapted to
requirements for living comfort and saving energy:
•Comfort
•Standby
•Night mode
•Frost protection mode
A setpoint value is assigned to each operating mode.
Comfort mode is used when the room is occupied
The setpoint value is reduced slightly in standby mode. This operating mode is used when the
room is not occupied but is expected to be shortly.
The setpoint value is drastically reduced in night mode as the room is not expected to be
occupied for several hours.
In frost protection mode, the room is controlled to a temperature that eliminates the risk of
damage to the radiators caused by freezing due to low outdoor temperatures.
This may be required for 2 reasons:
- The room is not occupied for several days.
- A window has been opened and no further heating is required for the time being.
The operating modes are usually controlled by a timer.
However, a presence detector and/or presence keys and window contacts are recommended for
optimum control.
See Determining the setpoint value chapter.

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Version: Dec-10 (subject to change) Page 5 of 65
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;
see Object characteristics.
1.2 Benefits of RAM 712
•Continuous P / PI or switching room thermostat
•Temperature sensor can be sited as required
•Operating mode change via presence and window objects
•Heating and cooling operation
•Infinite regulation through continuous actuating value
•2 binary inputs for conventional keys/switches or
for blinds / dimmer control
•Adjustable effect with binary inputs
•Blinds and dimmers can also be controlled using single key operation
1.2.1 Special features
•The absence of control elements is primarily suited to public buildings, for example
schools.
•Very small dimensions; can be installed in a flush-mounted socket
•Single key operation allows the 2 external connections to control one set of blinds or a
dimmer
•Both external connections can be used for LED control if required.

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Version: Dec-10 (subject to change) Page 6 of 65
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
Protection class:
III in accordance with EN 60730-1
Protection rating:
IP 20 in accordance with EN 60529
Dimensions:
LxWxH 74 x 74 x 28 (mm)
Inputs
Contact voltage:
3.3 V internal provided
Contact current:
0.1 mA
Maximum line length:
5 m

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Version: Dec-10 (subject to change) Page 7 of 65
3 RAM 712 V1.0
application program
3.1 Selection in the product database
Manufacturer
Theben AG
Product family
Heating, ventilation, air conditioning
Product type
Continuous and 2 point controller
Program name
RTR RAM 712 UP
The ETS database can be found on our website: http://www.theben.de
3.2 Parameter pages
Table 1
Function
Description
Settings
Selection of control functions,
Standard and user-defined settings, activation of the external
interface
Setpoint values
Setpoint value after download, values for night, frost mode etc.
Cooling setpoint
values
Dead zone and temperature increases conditional on the operating
mode
Actual value
Send actual value, calibration
Heating control
Type of control, heating parameters etc.
Cooling control
Type of control, cooling parameters etc.
Operating mode
Operating mode after reset, presence sensor
Input E1 .. E2
Function of connected contacts, switches, dimmers, blinds.

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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
No. Function Object name Type
Flags
C
R
W
T
0
Defining the setpoint
temperature
Base setpoint value
2 bytes
EIS5

1 Offset Manual setpoint offset
2 bytes
EIS5 
2 Send actual value Actual value
2 bytes
EIS5 
3 Operating mode preset Operating mode preset
1 byte
KNX

1 = night, 0 = standby Night < - > standby
1 bit
EIS 1

4
Input for presence signal
Presence
1 bit
  
1 = Comfort
Comfort
1 bit
  
5
Input for window contact
Window position
1 bit
  
1 = Frost protection
Frost / heat protection
1 bit
  
6 Report current operating mode Current operating mode
1 byte
KNX

7
Send current actuating value Heating control variable
1 byte
EIS6

Send current actuating value Heating control variable
1 bit
EIS1

Send current actuating value
Heating and cooling
actuating value
1 byte
EIS6

Send current actuating value
Heating and cooling
actuating value
1 bit
EIS1 
8 Send control variable Cooling control variable
1 byte
EIS6 
Send control variable Cooling control variable
1 bit
EIS1

9 Heating = 0, cooling = 1
Switchover between heating
and cooling
1 bit
EIS1

10 Report current setpoint value Current setpoint value
2 bytes
EIS5

C
R
W
T

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Continuation:
No. Function Object name Type
Flags
C
R
W
T
11
Switching ON/OFF Input 1 switching
1 bit
EIS 1

Priority Input 1 priority
2 bit
EIS 8

Send value Input 1 value
EIS 14
1 byte
Send temperature value Input 1 temperature
EIS 5
2 byte
Switching ON/OFF Input 1 dimming
1 bit
EIS 1 
Step / stop Input 1 blinds
1 bit
EIS 1

Send value Input 1 value
1 byte
EIS 14
Call/save light scene Input 1 value
1 byte
DTP
18.001
Height position Input 1 value
1 byte
EIS 6
Switching ON/OFF Input 1 LED
1 bit
EIS 1

12
Brighter
Darker
Brighter / darker
Input 1 dimmer 4 bit
EIS 2 
DOWN
UP
UP/DOWN
Input 1 blinds 1 bit
EIS1 
13 Lock Input 1
1 bit
EIS1

C
R
W
T

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Version: Dec-10 (subject to change) Page 10 of 65
Continuation:
No. Function Object name Type
Flags
C
R
W
T
14
Switching ON/OFF Input 2 switching
1 bit
EIS 1

Priority Input 2 priority
2 bit
EIS 8

Send value Input 2 value
EIS 14
1 byte
Send temperature value Input 2 temperature
EIS 5
2 bytes
Switching ON/OFF Input 2 dimming
1 bit
EIS 1 
Step / stop Input 2 blinds
1 bit
EIS 1

Send value Input 2 valuator
1 byte
EIS 14
Call/save light scene Input 2 value
1 byte
DTP
18.001
Height position Input 2 valuator
1 byte
EIS 6
Switching ON/OFF Input 2 LED
1 bit
EIS 1

15
Brighter
Darker
Brighter / darker
Input 2 dimmer 4 bit
EIS 2 
DOWN
UP
UP/DOWN
Input 2 blinds 1 bit
EIS1 
16 Lock Input 2 lock
1 bit
EIS1

17 Scene control Call/save scene
1 byte
DTP
18.001

C
R
W
T
Table 3
Number of communication objects
18
Number of group addresses
20
Number of associations
20

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Version: Dec-10 (subject to change) Page 11 of 65
3.3.2 Description of objects
•Objekt 0 "Base setpoint value"
The 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).
The object has no write cycles limit.
•Object 1 "Manual setpoint value adjustment"
Setpoint temperature adjustment:
The object receives a temperature differential in EIS 5 format. The desired room temperature
(current setpoint value) can be adjusted from the base setpoint value by this differential.
The following applies in comfort mode (heating):
Current setpoint value (object 10) = Base setpoint value + manual setpoint value offset (obj. 1)
Values beyond the configured range (maximum or minimum valid setpoint value on the setpoint
values parameter page) are limited to the highest or lowest value.
Note:
The adjustment always relates to the set base setpoint value and
not to the current setpoint value .
See : Determining the setpoint value
•Object 2 "Actual value"
This object sends the temperature currently being measured by the sensor (if sending via
configuration is permitted).
The value –(60°C) is sent as a signal in the event of a defective sensor or interference on the
sensor connection.

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•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.
Table 4
Objects for determining the operating
mode
Object function
Operating mode, presence, window
status
1 byte object. One of 4 operating modes can be
directly activated.
1 = comfort, 2 = standby, 3 = night,
4 = frost protection (heat protection)
If another value is received (0 or >4) the comfort
operating mode is activated.
The details in brackets refer to cooling mode
old.: Comfort, night, frost
1 bit object.
Night or standby operating mode can be activated.
0=standby 1=night
•Object 4 "Presence" / "comfort"
The function of this object depends on the objects for setting operating mode on the operating
mode parameter page.
Table 5
Objects for determining the operating
mode
Object function
Operating mode, presence, window
status
Presence:
The status of a presence indicator (e.g. sensor,
motion detector) can be received via this object.
1 on this object activates the comfort operating
mode.
old: Comfort, night, frost
Comfort:
1 on this object activates the comfort operating
mode.
This operating mode takes priority over night and
standby modes.
Comfort mode is deactivated by sending a 0 to the
object.

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•Object 5 "Window position" / "frost/heat protection"
The function of this object depends on the objects for setting operating mode parameter on
the operating mode parameter page.
Table 6
Objects for determining the operating
mode
Object function
Operating mode, presence, window
status
Window position:
The status of a window contact can be received via
this object.
1 on this object activates the frost / heat protection
operating mode.
old: Comfort, night, frost
Frost/heat protection:
1 on this object activates the frost protection
operating mode.
The heat protection mode is activated during
cooling.
The frost/heat protection operating mode takes top
priority.
The frost/heat protection mode remains until it is
cleared again by entering 0.
•Object 6 "Current operating mode"
Transmits the current operating mode as a 1 byte value (see table).
The send response can be set on the operating mode parameter page.
Table 7: Coding of HVAC operating modes:
Value
Operating mode
1
Comfort
2
Standby
3
Night
4
Frost protection/heat protection

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•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.
•Object 8 "Cooling control variable"
Sends the cooling actuating value or switching command to control a cooling surface, fan coil
unit etc.
The send format, EIS6 or EIS1, depends on the type of control selected
(continuous or switching) on the cooling control page.
Note:
Object 8 is not available:
- With the setting heating control only (parameter page settings), as cooling function is not
available.
- If switchover between heating and cooling → via object is selected and the output of cooling
actuating value is configured to together with heating actuating value (parameter page: Cooling
control).
•Object 9 "Switching between heating and cooling"
This object is used in 2-pipe heating/cooling systems or if automatic switchover between heating
and cooling is not required.
The cooling operation is forced via 1 and the heating operation via 0.
•Object 10 "Current set point value"
Sends current setpoint value in EIS5 format to the bus.

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•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 .
The function and type of object are dependent on function of input and object type parameters.
Table 8
Input function
Function
Description
Switch/key
Switching ON/OFF
Sends 1 bit switching commands in EIS 1
format
Priority
Sends priority telegram in 2 bit format
Send value
Sends a value between 0 and 255
Send temperature
value
Sends a temperature value in 2 byte format
Dimming
Switching ON/OFF
Switches dimmer on and off
Blinds
Step / stop
Sends 1 bit "UP" or "DOWN" telegrams.
Value
Valuator short/long
Sends 2 different 8 bit values depending on
length of time keystroks
Value for light
setting
Call/save light scene via 8 bit telegram
Valuator for blinds
Sends an 8 bit percentage value for positioning
blinds
Control LED
Receives 1 bit telegram for controlling LED
•Objects 12, 15 "Brighter, darker, brighter/ darker, UP, DOWN, UP/DOWN, slat
position"
The function and the type of object also depend on input function parameter.
Table 9
Input function
Function
Description
Switch/key
Not available
Dimming
Brighter , darker
Brighter / darker
4 bit dimming commands for the dimming
actuator in EIS 4 format
Blinds
UP, DOWN,
UP/DOWN
1 bit motion commands for the blinds actuator
in EIS 7 format
Value for blinds
Slat position
Sends 1 byte telegram for positioning slats
Control LED
Not available

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•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
•Object 17 "Scene control"
Scenes can be saved or called via this object.
The current operating mode is allocated to the selected scene number when saving.
Up to 64 different scenes are supported.
See appendix: The scenes

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3.4 Parameters
The standard values are in bold.
3.4.1 Settings
Table 10
Designation
Values
Application
Control
Standard
For simple applications
User-defined
Enables selection of control
functions
Control functions used
User-defined control
Heating control only
Heating operation only
Heating and cooling
An additional cooling system
can be controlled (object 8) .
Function of external
interface
Inactive
Active
Determines whether external
interface is being used.

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3.4.2 Heating control
Table 11
Designation
Values
Application
Type of control
Continuous control
Infinite control
(0 .. 100%).
2-point control
Switching control (On/Off).
See appendix: Continuous and
switching control
Sets the control parameters
Via system type
Standard application
User-defined
Professional application: Self-
configured P/PI control
System type
PIcontrol with:
Radiator heating
Integrated time = 90 minutes
Bandwidth = 2.5 k
Underfloor heating
Integrated time = 180 minutes
Bandwidth = 4 k
LED function
LED function on circuit
board.
Always off
LED is not used
With heating ON
Should light in heating mode
Always ON
Should light permanently
Sending heating actuating
value
With change of 1 %
With change of 2 %
With change of 3 %
With change of 5 %
With change of 7 %
With change of 10 %
With change of 15 %
After how much % change*
in the control variable is the
new value to be sent.
Small values increase control
accuracy but also the bus
load.
Sends heating actuating value
in cycles
Not cyclical, only in the
event of change
Every 2 min., every 3 min.
Every 5 min., every 10 min.
Every 15 min., every 20 min.
Every 30 min., every 45 min.
Every 60 min.,
How often is the current
heating actuating value to be
sent (regardless of changes)?
*Change since last transmission

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Continuation:
Designation
Values
Application
2-point control
Hysteresis of 2 point control
0.3 K, 0.5 K, 0.7 K
1 K, 1.5 K, 2 K
3 K, 4 K, 5 K
6 K
Interval between the switch-
off point (setpoint value) and
the turn back on point
(setpoint value – hysteresis).
The hysteresis prevents
constant switching on/off.
Recirculation of hysteresis
after switching point
None
0.1 K/min
0.2 K/min
0.3 K/min
Recirculation causes a gradual
decrease the hysteresis over
time. This increases control
accuracy.
The hysteresis is equivalent to
the programmed value for
each switch-off and is
gradually reduced by the
recirculation process. The
hysteresis can reduce to 0 K
over prolonged periods of
switch-off.
At the next switch-on, it is
reset to the configured value.
User-defined parameters
Proportional band of heating
control
1 K, 15 K, 2 K, 2.5 K, 3 K
3.5 K, 4 K, 4.5 K
5 K, 5.5 K, 6 K
6.5 K, 7 K, 7.5 K
8 K, 8.5 K
Professional setting to adapt
the control response to the
room.
Small values cause large
changes in control variables,
larger values cause finer
control variable adjustment.
See appendix: Temperature
control
Integrated time of the heating
control
Pure P control
15 min., 30 min., 45 min.
60 min., 75 min., 90 min.
105 min., 120 min., 135 min.
150 min., 165 min., 180 min.
195 min., 210 min., 225 min.
See appendix: Response of PI
control
The integrated time
determines the reaction time
of the control.
It lays down the increase that
the output control variable is
raised by, in addition to the P
share. The I- share remains
active for as long as there is a
control deviation. The I share
is added to the
P share.

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3.4.3 Setpoint values
Table 12
Designation
Values
Application
Base setpoint value after
loading application
18 °C, 19 °C, 20 °C,
21 °C, 22 °C, 23 °C,
24 °C, 25 °C
Output setpoint value for
temperature control.
Reduction in standby mode
(during heating)
0.5 K, 1 K, 1.5 K
2 K, 2.5 K, 3 K
3.5 K, 4 K
Example: with a base setpoint
value of 21 °C in heating
operation and a
reduction of 2K, controls
RAM 712 at a setpoint value
of 21 – 2 = 19 °C
Reduction in night mode
(during heating)
3 K, 4 K, 5 K
6 K, 7 K, 8 K
By what value should the
temperature be reduced in
night mode?
Setpoint value for frost
protection operation (during
heating)
3 °C, 4 °C, 5 °C
6 °C, 7 °C, 8 °C
9 °C, 10 °C
Preset temperature for frost
protection operation in
heating mode
(Heat protection operation
applies in cooling mode).
Setpoint value offset only
applies
Only in comfort mode
Setpoint value adjustment:
Is only considered in the
selected mode and is
ineffective in all operating
modes.
With comfort and standby
mode
With comfort, standby and
night mode