Satel KNX-DIM21 User manual

KNX-DIM21
Universal two-channel dimming actuator
Firmware version 1.01 knx-dim21_en 12/19
SATEL sp. z o.o. •ul. Budowlanych 66 • 80-298 Gdańsk • POLAND
tel. [phone]
www.satel.eu

IMPORTANT
The device should be installed by qualified personnel.
Prior to installation, please read carefully this manual in order to avoid mistakes that can lead
to malfunction or even damage to the equipment.
Changes, modifications or repairs not authorized by the manufacturer shall void your rights
under the warranty.
SATEL aims to continually improve the quality of its products, which may result in changes in
their technical specifications and software. Current information about the changes being
introduced is available on our website.
Please visit us at:
http://www.satel.eu
The declaration of conformity may be consulted at www.satel.eu/ce
The following symbols may be used in this manual:
- note,
- caution.

SATEL KNX-DIM21 1
CONTENTS
1. Features ...........................................................................................................................2
2. Description........................................................................................................................2
2.1 Load types..................................................................................................................................4
2.2 Overheating protection...............................................................................................................4
2.3 Wiring diagram of module outputs..............................................................................................5
2.4 Enclosure ...................................................................................................................................5
3. Installation ........................................................................................................................5
3.1 Connection diagram ...................................................................................................................6
4. Configuring the module.....................................................................................................7
4.1 Function priorities.......................................................................................................................8
4.2 Configuring global parameters ...................................................................................................9
4.3 Configuring the channels..........................................................................................................10
4.3.1 Value limits.......................................................................................................................................14
4.3.2 Time.................................................................................................................................................15
4.3.3 Scene 1-bit.......................................................................................................................................22
4.3.4 Scene...............................................................................................................................................25
4.3.5 Value forcing....................................................................................................................................26
4.4 Communication objects............................................................................................................27
4.4.1 Global objects..................................................................................................................................27
4.4.2 Channel objects...............................................................................................................................29
4.5 Restoring the module factory settings......................................................................................34
5. Specifications .................................................................................................................34

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The KNX-DIM21 module is a universal two-channel dimming KNX actuator that allows
stepless control of light sources up to 300 W per channel. The light can be turned on / off,
dimmed down (darker) / dimmed up (brighter), set by using a predefined scene or another
function via the KNX bus. The actuator can be used with resistive, inductive and capacitive
loads (R, L, C).
This module is designed for use with 230 VAC power and may not be used for
dimming light sources supplied with DC current, as this might damage the
module and the connected load.
1. Features
Communication with KNX bus via integrated bus connector.
Automatic recognition of the connected load type.
Adjustable lighting characteristic to suit the load type.
Two-stage, firmware-hardware overheating protection system.
Overload protection.
Feedback on status of module and individual channels.
Definable reaction of each channel in case of KNX voltage loss and recovery.
Definable behavior of each channel in case of voltage recovery.
Time functions (switching delay, staircase function with warning option and operating time
change).
Value forcing function.
Option to call scenes for each channel by using 1- and 8-bit commands.
Manual operation of each channel status by using buttons on the enclosure.
LEDs to indicate each channel status and signal troubles.
Ability to be mounted on DIN rail (35 mm).
Module configuration using ETS software.
2. Description
load circuit terminals L1, L2, N, .

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LEDs to indicate channel status / troubles ( and –green, –red) –see Table 1.
LED
A / B channel status
blocked (startup delay)
mains synchronization / load detection
no load / unknown load type before detection
switched off
switched on
Trouble type
overload
overheat
voltage trouble
hardware failure
–OFF, –ON, –flashing.
Table 1.
If a hardware failure is reported, de-energize the 230 VAC load circuit and
disconnect the KNX bus cable to reset the module. If, after power-on and restart
of the module, the channel keeps on reporting failure, power off the module and
notify the service technicians about the fault. Further operation of the module
may pose hazard to the health or life of the operator and may damage the
module as well as the connected load.
buttons for manual control of the channels –see Table 2.
Button
Operation
Reaction
short press
switch on
long press
dim up
short press
switch off
long press
dim down
+
short press
detection of load connected to the channel
The module will interpret button press as a long one when the button is held down
longer than for 1 second.
Table 2.
The brightness value set by using buttons is not saved to the non-volatile memory of
the module.
Starting detection of the connected load by using the buttons is only possible when the
automatic mode of load detection is selected for the channel in the ETS program (see
“Configuring the channels”).

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You can also use the buttons to restore factory settings of the module (see “Restoring
the module factory settings”).
red LED –ON when a physical address is being assigned by using the ETS program.
The address assignment can be activated manually with the button on the enclosure
or remotely from the ETS program.
programming button (to be used to assign the physical address).
terminal to connect the KNX bus.
2.1 Load types
The module is designed for use with the following load types:
–resistive (R),
–inductive (L),
–capacitive (C).
After connecting the mains voltage, the module can automatically recognize the type of
connected load. How the connected load will be detected is defined separately for each
channel in the ETS program (see “Configuring the channels”).
It is recommended that automatic detection of the connected load be performed.
Selecting an incorrect type of load for the channel may damage the module and
the connected load.
You can combine different types of loads within the lighting groups connected to one
channel. Resistive (R) and inductive (L) loads, as well as resistive (R) and capacitive (C)
loads can be combined into groups. For detailed information, see section “Configuring the
channels”.
You must not combine inductive loads with capacitive ones. Connecting the
loads of this type to one channel will damage the module.
2.2 Overheating protection
The module heats up during operation, because part of the power is converted into heat as
power loss. For protection against overheating, the module is provided with firmware /
hardware safety protections which switch off and lock the channels at all times when the
module temperature reaches its maximum permissible value. After the module cools down,
the channels are unlocked, but they still remain switched off. The specified operating
parameters will only be restored after the channel is enabled by the user.

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2.3 Wiring diagram of module outputs
The module has two independent channels based on two independent circuits with
a common neutral point.
2.4 Enclosure
The module occupies 4 units on the 35 mm DIN rail.
3. Installation
Disconnect power before making any electrical connections.
The module is designed for indoor installation, in spaces with normal air humidity, e.g. in
distribution boxes on 35 mm DIN rail.
1. Mount the module on the mounting rail.
2. Connect the loads to load terminals. For designations of the terminals see the front panel.
All connections should be made in accordance with the wiring diagram (see
“Connection diagram”).

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3. Use the connection terminal to connect the KNX bus cable to the module.
The module is supplied with voltage from the KNX bus and requires no additional
power supply.
4. Connect a computer running ETS program to the KNX bus and configure the module.
To configure the module, you will require a computer running the ETS program version
5.5 or newer, provided with USB or Ethernet (TCP/IP) connector. The SATEL ETS
application file, which can be downloaded from www.satel.eu/ets, must be imported
into the program.
3.1 Connection diagram
Fig. 4 shows how the load can be connected to the module:
I and II –multi-phase mode,

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III and IV –single-phase mode.
The maximum load that can be connected to each channel is 300 W. The load can only be
connected to one channel.
Never connect the module channels in parallel to increase the maximum load
power (Fig. 5-I). Connecting the modules as shown in Fig. 5-II to power supply
one module from the other is also forbidden. Making connections as shown in
Fig. 5-I or 5-II may cause damage to the modules and the connected load.
4. Configuring the module
Working parameters of the module are defined in the ETS program (version 5.5 or higher).
The tabs for defining individual parameters are built dynamically. Depending on the selected
options, further parameters may be displayed in the tabs or further tabs may be displayed
when defining parameters. Moving the cursor over the selected parameter will display
a tooltip with default value or value range for that parameter.
The module has two groups of configuration parameters. The first group includes global
parameters which define general functionality of the module, but have no immediate effect on
individual channels (see “Configuring global parameters”). The other group includes
parameters assigned to the channel. These parameters have direct effect on how the
channel will react to functions activated in the module or how its status will change (see
“Configuring the channels”).
The module working parameters defined in the ETS program, automatically detected
(connected load type) and set as a result of learning scenes by the module, are saved
to the non-volatile memory of the module. Remember that using the “Download”
command to save the new settings defined in the ETS program will erase the other
data saved to that memory.

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4.1 Function priorities
The order in which the functions can change the status of channels in the module depends
on what priority the given function has. The value forcing function has the highest priority,
whereas the switching and dimming functions have the same priority (see Fig. 5). A higher
priority function can override the channel status previously set by a lower priority function.

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The lower priority functions cannot control the channel state as long as a higher
priority function is active.
In the ETS program, you can define the minimum and maximum limit value of
brightness that can be set for the channel (see “Value limits”). If the brightness value
defined for a function is higher than the maximum one or lower than the minimum one,
the corresponding limit value will be set for the channel. The limit values can be
changed by a telegram from the KNX bus.
Example. If the “Value forcing function” is activated when the “Staircase” time function is
running, the time function will be terminated, and the channel status will be set by the forcing
function. However, if the channel status is set by the “Value forcing function”, the activated
“Staircase” time function cannot change the channel status (it will be ignored).
4.2 Configuring global parameters
The main operating parameters of the module are defined in the “Global” tab, as shown
below.
Startup delay –time period by which the module startup will be delayed after power-on.
Value 00:00:00 will disable the delay.
During the delay period the telegram functionality is stopped and the channels do not
change their status. The module sends no telegrams to the KNX bus. After the delay
expires, the telegrams will be sent and the status of channels will be set according to the
parameters defined. If any telegrams are received from communication objects during the
delay period, they will be stored. Replies to these telegrams will be sent after the delay
time has expired.
The startup delay may be used to reduce load on the KNX bus and supply circuit after
power-on.
Interval of cyclic device status sending –frequency with which a telegram with the module
status information is sent to the bus by the “Device operation status” communication
object. Information contained in the telegram makes it possible to monitor the module
operation by other devices on the KNX bus. Value 00:00:00 disables the sending.
Sending telegrams may be enabled either permanently, for continuous monitoring of
the module operation, or during testing only. If you do not want to load the bus with an
excessive number of telegrams, you can set the sending cycle time at the highest
possible value.
Interval of cyclic device load alarm sending –frequency of sending a telegram with
information about missing load in one of the module channels (e.g. as a result of bulb

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burnout). The telegram is sent by the “Device load alarm” communication object. Value
00:00:00 disables the cyclic telegram sending.
Interval of cyclic device fault alarm sending –frequency of sending a telegram with
information about fault in one of the module channels. The telegram is sent by the “Device
fault alarm” communication object for each fault type: overload (overcurrent flow in the
channel), overheat, voltage loss in the load circuit (230 V) or hardware failure. Value
00:00:00 disables the cyclic telegram sending.
Channel A –enabling / disabling channel “A” (Disable / Enable). Enabling the channel will
enable the communication objects that allow you to monitor the lighting connected to the
channel and display the “Channel A” tab to define the channel operating parameters.
Channel B –enabling / disabling channel “B” (Disable / Enable). Enabling the channel will
enable the communication objects that allow you to monitor the lighting connected to the
channel and display the “Channel B” tab to define the channel operating parameters.
4.3 Configuring the channels
The status of each channel can be changed by using one of the three methods:
switch on / switch off –1-bit object (1.001 Switch),
dim up / dim down –4-bit object (3.007 Dimming control),
set brightness values –8-bit object (5.001 Percentage).
Each module channel has the same group of parameters. How to define the parameters has
been discussed based on the channel A. Shown below is the “General” tab for defining
parameters.

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Load type –you can select:
Detect after programming and load restore –the module itself will recognize the type of
load connected to the channel after programming and each time when load restore is
detected in the 230 V circuit.
Detect only once after programming
The automatic detection process will be triggered only when the brightness value set
for the channel is higher than 0. If the value is 0, the detection process will only be
triggered after this value is changed, e.g. as a result of switching on a channel or
calling a scene.
Resistive (leading edge)
Resistive (trailing edge)
Inductive / Conventional transformer (leading edge)
Capacitive / LED / CFL / Electronic transformer (trailing edge)
Do not connect a conventional (inductive) transformer to the module unless
a load is connected. Lack of transformer load will cause a resonance effect that
will damage the module. It is recommended that the connected transformer be
loaded with at least two incandescent bulbs. This will protect the module from
damage in case one of the bulbs burns out.
When selecting the load type (in the ETS program), follow the table below:
Load type
in ETS
Load connected to the channel
traditional
incandescent
light bulbs,
halogen light
bulbs HV
halogen light
bulbs NV, 12V-
LED powered
via conventional
transformer
(inductive)
halogen light
bulbs NV, 12V-
LED powered
via electronic
transformer,
230V-LED
(capacitive)
Detect after programming and load restore
Detect only once after programming
Resistive (leading edge)
Resistive (trailing edge)
Inductive / Conventional transformer (leading
edge)
Capacitive / LED / CFL / Electronic
transformer (trailing edge)
–recommended type, –not recommended type, but can be used, –type requires
checking if can be used, –prohibited type (may damage the module and connected load).
Remember that selecting a load type that is unsuitable for the channel may
damage the module and the connected load. If you are not sure which load type
to choose, it is recommended that you select the “Detect after programming and
load restore” or “Detect only once after programming” option to perform
automatic detection.

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Selecting the load type will also define the channel operation mode:
–load controlled by leading edge –suitable for resistive and inductive loads. Control
signal switches on the load when voltage between lines L and N is higher than 0 (during
the sine wave), and switches it off when the voltage is 0 V. This prevents a voltage
shock from occurring when an inductive load is connected to the channel.
Connecting a capacitive load to the channel operating in the “load controlled by
leading edge” mode may damage the module.
–load controlled by trailing edge –suitable for resistive and capacitive loads. Control
signal switches on the load when voltage between lines L and N is 0 V, and switches it
off during sine wave (voltage higher than 0). This prevents a voltage shock from
occurring when a capacitive load is connected to the channel. Selecting this operating
mode for incandescent light sources may prolong their life.
Connecting an inductive load to the channel operating in the “load controlled by
trailing edge” mode may damage the module.
Characteristic adjustment –you can select:
linear –no correction (light source characteristic),
quadrate,
semi-logarithmic,
logarithmic.
Different types of light sources (load types) have different lighting characteristics. This
characteristic shows how the source brightness (the intensity of light emitted by the
source) changes depending on the increase in the control value. Some sources need
a high initial value to start lighting, while others quickly start lighting with maximum
brightness. By selecting one of the methods to adjust the characteristic you can change
the linear characteristic (Fig. 7-I) to one that provides the best dimming up / down
parameters for the source connected to the channel. The figure below shows how
changing the value of communication object (X) that controls dimming up / down affects
brightness of the source (Y), depending on which adjustment method has been selected
(Fig. 7-II –semi-logarithmic method, Fig. 7-III –logarithmic method, Fig. 7-IV –quadrate
method).

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Legend to Fig. 7:
X –communication object value (0 = 0%, 255 = 100%),
Y –source brightness (0%...100% –percentage value, 0…255 – value on KNX bus),
A –linear characteristic,
B –corrected characteristic.
Adjustment of the characteristic results in bending the lighting characteristic curve,
however changing the light source brightness is perceived by the human eye as linear.
By defining the minimum and maximum limit value of brightness that can be set for the
channel (see “Value limits”), you can limit the characteristic to the interval in which the
dimming up / down process can be controlled. By doing so you can reject the “dead”
portions of the characteristic in which the brightness value change is negligible with a
simultaneous large change of the control value.
Interval of cyclic channel state sending (On / Off) –frequency with which a telegram with
information on the channel status (switched on/switched off) is sent to the bus. The
telegram is sent by the “Switch status” communication object. Information contained in the
telegram enables the channel status to be monitored by other devices on the KNX bus.
Value 00:00:00 disables the cyclic telegram sending.
Interval of cyclic absolute dim value sending –frequency with which a telegram with
information on the brightness value set for the channel is sent to the bus. The telegram is
sent by the “Absolute dim status” communication object. Information contained in the
telegram enables the channel status to be monitored by other devices on the KNX bus.
Value 00:00:00 disables the cyclic telegram sending.
Reaction to KNX bus recovery –channel reaction to the bus power recovery (last value on
channel [the last value stored in the channel will be set] / on / off).
Reaction to KNX bus failure –channel reaction to the bus power loss (last value on
channel [the last value stored in the channel will be set] / on / off).

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Reaction to supply mains recovery –channel reaction to the mains power recovery (last
value on channel [the last value stored in the channel will be set] / on / off).
The parameter defines the initial channel status after starting the module. Restart of
the device is also interpreted as loss of supply voltage. Note that each change of
settings in the ETS program will force the module restart.
Central switch –enabling / disabling the central switching function in the channel (Disable /
Enable). Enabling the function will make the channel react to any change of the “Switch
function” communication object status. As a result of the function action, the channel will
be switched to the status corresponding to the value stored in the communication object.
The “Switch function” object makes it possible to enable / disable all channels with one
telegram.
Central absolute dim –enabling / disabling the central function of setting brightness for the
channel (Disable / Enable). Enabling the function will make the channel react to any
change of the “Absolute dim function” communication object status. As a result of the
function action, brightness will be set in the channel according to the value stored in the
communication object.
The “Absolute dim function” object makes it possible to set the same brightness value for
all channels by using one telegram.
Value limits –enabling / disabling the possibility to define limit values for the channel
(Disable / Enable). Selecting the “Enable” option will display the “Value limits” tab.
Time –enabling / disabling the time function for the channel (Disable / Enable). Enabling the
function will display the “Time” tab.
Scene 1-bit –enabling / disabling the possibility to define 1-bit scenes for the channel
(Disable / Enable). Enabling the 1-bit scenes will enable the “Call scene 1-bit (1/2)”
communication object and display the “Scene 1-bit” tab in the program.
Scene –enabling / disabling the possibility to define scenes for the channel (Disable /
Enable). Enabling the scenes will enable the “Scene” communication object and display
the “Scene” tab in the program.
Value forcing –enabling / disabling the value forcing function in the channel (Disable /
Enable). Enabling the function will enable the “Forced value” communication object and
display the "Value forcing" tab in the program.
4.3.1 Value limits
The limit values make it possible to define the minimum and maximum brightness value that
can be set for the channel. If limit values are defined for the channel, the maximum value will
be set for the “ON” channel status, and the minimum value for the “OFF” channel status. The
dimming down / up process in the channel will also remain within the limit values, irrespective
of what value has been defined for the function activated in the channel (e.g. "Staircase") or
for the called scene. If the option of setting the limit values from KNX bus is selected during
configuration, the “Set minimum value” and “Set maximum value” communication objects will
be enabled.

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Description of parameters
Learning limiting values from bus –selecting the “Yes”option will enable the “Set
minimum value”and “Set maximum value”communication objects, which allow you to
change the minimum and maximum brightness value for the channel from the bus. The
“Minimum initial value”and “Maximum initial value”selection fields will be displayed.
Minimum initial value –you can select how the initial value of the “Set minimum value”
object will be set:
default –value defined in the “Minimum dim value” field.
last value from bus –value that was set by the last telegram from the bus. If the value of
the “Set minimum value” object was not changed by the telegram from the bus, the
default value from the “Minimum dim value” field will be set.
Minimum dim value –the minimum brightness value that can be set for the channel (0 –
100).
Maximum initial value –you can select how the initial value of the “Set maximum value”
object will be set:
default –value defined in the “Maximum dim value” field.
last value from bus –value that was set by the last telegram from the bus. If the value of
the “Set maximum value” object was not changed by the telegram from the bus, the
default value from the “Maximum dim value” field will be set.
Maximum dim value –the maximum brightness value that can be set for the channel (0 –
100).
4.3.2 Time
Two time functions are available in the module:
Staircase.

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Delay (switching/dimming).
Staircase
Switches on the channel for a defined period of time. You can define in the function:
value of the function control telegram.
brightness value VON, up to which the light source will be dimmed up after the function is
activated (Fig. 9).
time TON during which light will be on. After enabling the “Duration set from bus” option,
the channel ON time can be changed from the bus by using the “Staircase duration”
communication object.
warning that the channel is about to be switched off in the form of:
a special “Staircase warning” group object,
dimming the light down / up,
both methods at the same time.
brightness value VDIM, down to which the light source will be dimmed during the warning
period (Fig. 9).
warning duration TW, which defines how long the warning will be activated before the
channel is switched off (Fig. 9-I). If the time TWis longer than the time TON, switching on
the channel will activate the warning, and the channel will be ON for the time TW
(Fig. 9-II).
number of telegrams LTthat can prolong the light ON duration. If the channel is switched
off, each successive telegram will extend the channel ON time by the time TON (Fig. 10-I).
Figures 10-II & 10-III show how the channel will react to telegrams when it is switched on.

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