Sentera Controls SDX-DM Series Service manual

SDX-DM ELECTRONIC
FAN SPEED
CONTROLLER
Mounting and operating instructions

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
Table of contents
SAFETY AND PRECAUTIONS 3
PRODUCT DESCRIPTION 4
ARTICLE CODES 4
INTENDED AREA OF USE 4
TECHNICAL DATA 4
STANDARDS 4
OPERATIONAL DIAGRAMS 5
WIRING AND CONNECTIONS 5
MOUNTING INSTRUCTIONS IN STEPS 6
OPERATING INSTRUCTIONS 8
TRANSPORT AND STORAGE 8
WARRANTY AND RESTRICTIONS 8
MAINTENANCE 8

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
SAFETY AND PRECAUTIONS
Read all the information, the datasheet, Modbus map, mounting and operating
instructions and study the wiring and connection diagram before working with the
product. For personal and equipment safety, and for optimum product performance,
make sure you entirely understand the contents before installing, using or maintaining
this product.
For safety and licensing (CE) reasons, unauthorised conversion and/ or modifications
of the product are inadmissible.
e product should not be exposed to abnormal conditions, such as extreme
temperatures, direct sunlight or vibrations. Long-term exposure to chemical
vapours in high concentration can affect the product performance. Make sure the
work environment is as dry as possible; avoid condensation.
All installations shall comply with local health and safety regulations and local
electrical standards and approved codes. is product can only be installed by
an engineer or a technician who has expert knowledge of the product and safety
precautions.
Avoid contacts with energised electrical parts. Always disconnect the power
supply before connecting, servicing or repairing the product.
Always verify that you apply appropriate power supply to the product and use
appropriate wire size and characteristics. Make sure that all the screws and nuts
are well tightened and fuses (if any) are fitted well.
Recycling of equipment and packaging should be taken into consideration and these
should be disposed of in accordance with local and national legislation/regulations.
In case there are any questions that are not answered, please contact your
technical support or consult a professional.

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
PRODUCT DESCRIPTION
e SDX-DM series are electronic fan speed controllers, which allow you to manually
adjust the rotational speed of single phase AC motors by varying the motor voltage
through phase angle control. e output can be regulated from minimum to maximum
or from maximum to minimum. e operating mode can be selected via Modbus
RTU. e controller is suitable for both inset (IP44) and surface mounting (IP54). All
parameters and settings can be adjusted via Modbus RTU communication.
ARTICLE CODES
Output regulation (from low to high or from high to low)
Code Rated current range [A]
SDX-1-15-DM 0,1—1,5
SDX-1-25-DM 0,2—2,5
INTENDED AREA OF USE
■Manual control of the motor / fan speed in HVAC applications
■For indoor use only
TECHNICAL DATA
■Inset or surface mounting
■Supply voltage (Us): 230 VAC / 50—60 Hz
■Spring contact terminal block
■Motor acceleration: kick start (from 2 to 20 seconds) or soft start
■Regulated output to motor: Umin—Us
■Minimum and maximum output voltage are adjustable via Modbus RTU
communication. Vmin: 20—70 % of Us and Vmax: 75—100 % of Us
■Overheating protection
■Operating mode selectable via Modbus RTU: from low to high speed or from high
to low speed
■Enclosure:
►External: ASA, white colour (28049P), IP54 protection (according to EN 60529)
►Internal: polyamide, natural colour, IP44 protection (according to EN 60529)
■Operating ambient conditions:
►temperature: 0—40 °C
►rel. humidity: 5—95 % rH (non-condensing)
STANDARDS
■Low Voltage Directive 2014/35/EU
►EN 60529:1991 Degrees of protection provided by enclosures (IP Code)
Amendment AC:1993 to EN 60529
►EN 60730-1:2011 Automatic electrical controls for household and similar use -
Part 1: General requirements
■EMC directive 2014/30/EU:
►EN 60730-1:2011 Automatic electrical controls for household and similar use -
Part 1: General requirements
►EN 61000-6-1:2007 Electromagnetic compatibility (EMC) - Part 6-1: Generic
standards - Immunity for residential, commercial and light industrial
environments
►EN 61000-6-3:2007 Electromagnetic compatibility (EMC) - Part 6-3: Generic
standards - Emission standard for residential, commercial and light-industrial
environments Amendments A1:2011 and AC:2012 to EN 61000-6-3

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
►EN 61000-3-2:2014 Electromagnetic compatibility (EMC) – Part 3-2: Limits -
Limits for harmonic current emissions (equipment input current ≤ 16 A per phase)
■WEEE Direc tive 2012/19/EU
■RoHs Directive 2011/65/EU
OPERATIONAL DIAGRAMS
Low to high speed with soft start Low to high speed with kick start
Uout [%]
Min. Max.
Off
Switch
On
0
Potentiometer position
Umax
Umin
Uout [%]
Min. Max.
Off
Switch
On
0
Potentiometer position
Umax
Umin
Kickstart
2—20 s
High to low speed with soft start High to low speed with kick start
Uout [%]
Min. Max.
Off
Switch
On
0
Potentiometer position
Umax
Umin
Uout [%]
Min. Max.
Off
Switch
On
0
Potentiometer position
Umax
Umin
Kickstart
2—20 s
NOTE By default, the desired fan speed or output value is set via the built-in potentiometer.
It is possible to overrule the built-in potentiometer via Modbus RTU communication.
Output overwrite can be enabled via Modbus Holding register 12. When output
overwrite is enabled, the desired output value can be written in Modbus Holding
register 13. In that case it is advisable also to activate Modbus safety timeout
by writing a value different from 0 in Holding register 8. After the time out period
elapses, the output is forced to the minimum output value. If timeout is set to zero,
this function is disabled.
ATTENTION Overheating protection is activated when an excessive load is connected to the
output or in case the ambient temperature exceeds the maximum allowed operating
temperature. When overheating protection is activated, the output is disabled and
overheat condition is indicated in Modbus input register 10. When the overheating
condition is removed, the device automatically resumes operation.
WIRING AND CONNECTIONS
AModbus RTU communication, signals A and /B
/B
LPower supply, line (230 VAC ±10 % / 50—60 Hz)
NPower supply, neutral
U2 Regulated output to motor, neutral
U1 Regulated output to motor, line
Connections Spring contact terminal block, cable cross section: 1,5 mm2; pitch 5 mm
Umax from
75—100 % Us
Umin from
20—70 % Us
Umax from
75—100 % Us
Umax from
75—100 % Us
Umax from
75—100 % Us
Umin from
20—70 % Us
Umin from
20—70 % Us
Umin from
20—70 % Us

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
MOUNTING INSTRUCTIONS IN STEPS
Before you start mounting the unit, read carefully “Safety and Precautions” and
follow these steps:
Inset mounting
1. Disconnect the mains supply.
2. Remove the knob by pulling it out.
3. Unscrew the washer to remove the cover of the external enclosure.
4. Do the wiring according to the wiring diagram (see Fig. 1 Wiring and connections).
5. Mount the internal enclosure into the wall according to the mounting dimensions
shown in Fig. 2 Mounting dimensions - inset mounting.
Fig. 1 Wiring and connections
Power Supply:
230 VAC / 50—60 Hz
Regulated output to
motor
Modbus RTU
communication
Fig. 2 Mounting dimensions - Inset mounting
58
58
58
58
4x ø 3,5mm
4x ø 3,5mm
58
58
76
76
Correct Incorrect
NOTE Mount the unit so that the terminal block and connections are at the lower side.

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
6. Mount back the cover and secure it with the washer.
7. Put back the knob and turn it to off position.
8. Turn on the power supply.
Surface mounting
1. Disconnect the mains supply.
2. Remove the knob by pulling it out.
3. Unscrew the washer to remove the cover of the external enclosure.
4. Mount the external enclosure onto the surface by means of the screws and dowels
adhering to the mounting dimensions shown in Fig. 3 Mounting dimensions -
surface mounting.
Fig. 3 Mounting dimensions - surface mounting
64
64
82
89
63,5
82
Correct Incorrect
5. Insert the cables through the grommets.
6. Do the wiring according to the wiring diagram (see Fig. 1 Wiring and connections).
7. Insert the internal enclosure into the external one and fix it using the screws.
NOTE Mount the unit so that the terminal block and connections are at the lower side.
8. Mount back the cover and secure it with the washer.
9. Put back the knob and turn it to off position.
10. Turn on the power supply.

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SDX-DM ELECTRONIC FAN SPEED
CONTROLLER
OPERATING INSTRUCTIONS
ATTENTION Use only tools and equipment with non-conducting handles when working on
electrical devices.
e controller is to be used only with voltage controllable fans/ motors. You can
connect several motors to the controller as long as the current limit is not exceeded.
e motor should be protected against overheating.
e minimum output value should be adjusted so that the motor cannot stall at
minimum speed. e controller restarts after power failure.
In case of faulty operation
Please check if:
■the right voltage is applied;
■the controller is not overheated;
■the Modbus communication is available;
■all connections are correct;
■the machine to be regulated is functioning.
TRANSPORT AND STORAGE
Avoid shocks and extreme conditions; stock in original packing.
WARRANTY AND RESTRICTIONS
Two years from the delivery date against defects in manufacturing. Any modifications
or alterations to the product after the date of publication relieve the manufacturer
of any responsibilities. e manufacturer bears no responsibility for any misprints or
mistakes in this data.
MAINTENANCE
In normal conditions this product is maintenance-free. If soiled, clean with a dry or
damp cloth. In case of heavy pollution, clean with a non-aggressive product. In these
circumstances the unit should be disconnected from the supply. Pay attention that
no fluids enter the unit. Only reconnect it to the supply when it is completelydry.