Name: Potentiometer for EC fan with dry contact | Sentera Controls | SDP-M010-DC
Brand: Sentera controls
SKU: SDP-M010-DC
Price: 68.03 EUR
Availability: InStock

Product description

Potentiometer for EC fan with dry contact | Sentera Controls | SDP-M010-DC

SDP-M010-DC – Sentera Controls potentiometer with dry contact and Modbus RTU communication, designed for EC fans and other equipment with a control input. Supplied with 24 VDC (PoM compatible), Ao output – 0-10 VDC, 0-20 mA or PWM 1 kHz, while Vmin, Vmax, control direction and output type are set via Modbus RTU.

Key idea:
This is a manual potentiometer that is also a Modbus RTU network device: the user changes the speed with the knob, while the integrator sets the limits and output type from a computer or BMS without opening the enclosure. An additional dry contact (up to 1 A) allows an external device to be switched on remotely.

Power supply
24 VDC (PoM)

Ao output
0-10 VDC / 0-20 mA / PWM 1 kHz

Communication
Modbus RTU (RS485)

OFF / contact
Dry contact 1 A

Operating principle

The potentiometer is installed in the room, while the controlled EC fan may be in a technical room. A 24 VDC supply (Us, GND), the Modbus RTU line (A, /B) and the output signal (Ao, GND) to the EC motor control input are connected, the dry contact (DC) – into the external device circuit.

This is not a power controller: only signal current flows through the potentiometer. The EC fan electronics change the speed themselves according to the received 0-10 VDC, 0-20 mA or PWM command.

Turning the knob changes the output steplessly between Vmin and Vmax. Vmin is set within 0–7 VDC / 0–14 mA / 0–70 % PWM, Vmax within 7.5–10 VDC / 15–20 mA / 75–100 % PWM. These limits, the control direction (min.→max. or max.→min.) and the output type are changed via Modbus RTU.

Engineer's note: the 24 VDC supply can be delivered together with the Modbus line (PoM), so a single four-core cable to the potentiometer is sufficient. Unlike SDP-E0US, the voltage output here is always 0-10 VDC, regardless of the supply.

Benefits SDP-M010-DC?
Manual control and Modbus RTU integration in one enclosure: the BMS sees and can change the settings, while the user in the room has a familiar knob.

Technical specifications

Product type	Potentiometer with Modbus RTU for an EC fan
Manufacturer / code	Sentera Controls / SDP-M010-DC
Series	SDP-M010 (AT – with OFF, BT – without OFF, DC – with dry contact)
Supply voltage (Us)	24 VDC (PoM compatible)
Ao output – voltage	0-10 VDC, RL ≥ 50 kΩ
Ao output – current	0-20 mA, RL ≤ 500 Ω
Ao output – PWM	1 kHz, RL ≥ 50 kΩ
Output range	Vmin–Vmax
Vmin	0–7 VDC / 0–14 mA / 0–70 % PWM
Vmax	7.5–10 VDC / 15–20 mA / 75–100 % PWM
Settings via Modbus RTU	Vmin, Vmax, control direction, output type
OFF position	None
Dry contact (DC)	Max. 1 A, for remote switching on / off of an external device
Terminals	Us, GND, A, /B, Ao, GND, DC; push-in, solid wire 0.5–1.5 mm², with ferrule 0.5–1.0 mm², stripping length 9–10 mm
Installation	Flush-mounted (IP44) or surface-mounted (IP54), 4× ø3.5 mm mounting holes
Protection class	IP44 / IP54 (EN 60529)
Operating environment	0–50 °C, < 95 % rH non-condensing
Weight	0.135 kg (net)
Compliance	LVD 2014/35/EU, EMC 2014/30/EU, RoHS 2011/65/EU, WEEE 2012/19/EU

Manufacturer documentation

✔ Recommended by Elektrotechnikos sprendimai

Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

Main functions

Modbus RTU – Vmin, Vmax, direction and output type are set remotely; the potentiometer is visible in the BMS.
Three output types – 0-10 VDC, 0-20 mA or PWM 1 kHz.
Fixed 0-10 VDC range – the output does not depend on the supply voltage – no need to limit it.
PoM compatibility – 24 VDC supply can be delivered together with the Modbus line.
Dry contact (up to 1 A) – remote on / off of an external device.
Universal enclosure – flush-mounted IP44 or surface-mounted IP54 installation.

Where is it used?

Buildings with BMS where manual ventilation control must be visible in the system
Offices, meeting rooms, hotel rooms
Heat recovery units and EC duct fans
Damper actuators with 0-10 V / 0-20 mA control
Sentera systems with PoM power supply

On-demand operation

For the automation / BMS integrator.
Settings and status are available via Modbus RTU – without additional converters.

For the ventilation installer.
One model with three output types; limits are changed without dismantling the enclosure.

For the user.
A conventional knob in the room; the speed changes steplessly.

Application guide: how it is used in practice

SDP-M010-DC can be adapted to different sites – only what is connected to its outputs changes:

Site	What is connected	Result	Installer's note
Office with BMS	Modbus RTU → A, /B; Ao (0-10 VDC) → EC fan	The user adjusts on site, the BMS sees the set value	A unique Modbus address for each device
Heat recovery unit in an apartment	Ao (0-10 VDC) → heat recovery unit EC fan input	Stepless control of ventilation intensity	Set Vmin according to the min. hygienic air volume
Damper with a proportional actuator	Ao (0-20 mA or 0-10 VDC) → actuator	Manual damper position control	In current mode, load ≤ 500 Ω
EC fan with a PWM input	Ao (PWM 1 kHz) → PWM input	Stepless speed	Change the output type via Modbus RTU
Fan with a damper or heater	DC contact → external device enable	An auxiliary device is controlled together with the ventilation	Contact load ≤ 1 A

How to select the controller current

Rated current of the motor(s)	Recommended model
OFF position needed, supply 5–24 VDC	SDP-E0US-AT (OFF, trimmers)
Continuous min. flow needed (no OFF), 5–24 VDC	SDP-E0US-BT (no OFF, trimmers)
Dry contact for an external device needed, 5–24 VDC	SDP-E0US-DC (dry contact 1 A)
OFF position and Modbus RTU needed, 24 VDC	SDP-M010-AT (OFF, Modbus RTU)
Modbus RTU needed without OFF position, 24 VDC	SDP-M010-BT (no OFF, Modbus RTU)
Modbus RTU and dry contact needed, 24 VDC	SDP-M010-DC (Modbus RTU, dry contact 1 A) ← this model
Simple 0–Us signal with OFF and dry contact needed	SDP-X10K-NA (10 kΩ, dry contact 1 A)

Rule: choose according to your needs: OFF needed – AT, constant min. airflow needed – BT, an external device needs to be controlled – DC. Motor power has no influence on the selection – only the control input load is checked (voltage / PWM ≥ 50 kΩ, current ≤ 500 Ω). If Modbus is not required and the supply is other than 24 VDC – choose SDP-E0US.

When to choose another solution: without Modbus, with 5–24 VDC supply and trimmers – SDP-E0US series; for 230 VAC supply with Modbus – SPV-8 series; with a display and stepped mode – RDCV9-AD; for AC fans – EVS-1 controllers.

Pros

Dry contact up to 1 A
Modbus RTU for settings and monitoring
0-10 VDC output is independent of the supply
Three output types
Suitable for PoM power supply
IP44 / IP54 installation

Cons / limitations

No OFF position
A 24 VDC supply is required – cannot be supplied directly from 230 VAC
Limits can be changed only via Modbus RTU (a converter and software are required)
This is a signal source – it does not directly control AC motor speed

Safety and installation notes

Installation and connection must be carried out by a qualified electrician with the supply to all connected devices disconnected.
Supply – 24 VDC; connecting 230 VAC to the terminals is prohibited.
Observe the output load limits: voltage / PWM ≥ 50 kΩ, current ≤ 500 Ω.
Dry contact load – no more than 1 A.
Connect the Modbus line with twisted-pair cable, observing the RS485 topology (line, not star).
Use at 0–50 °C, < 95 % rH non-condensing.

Quick selection guide

24 VDC

Modbus RTU

0-10 V / 0-20 mA / PWM

dry contact 1 A

IP44 / IP54

Suitable when you need:

control an EC fan manually and see the setting in the BMS;
change Vmin / Vmax and the output type remotely;
control an external device at the same time via the dry contact;

Check before use:

whether a 24 VDC (or PoM) supply is available;
the EC fan control input type and impedance;
the Modbus address plan and RS485 line topology.

Important reminder: SDP-M010-DC is a control signal source, not a power controller – the motor current does not flow through it.

FAQ

Can it be used without Modbus?
Yes, as a conventional potentiometer – however, Vmin / Vmax and the output type can only be changed via Modbus RTU.

What is PoM?
A Sentera solution where the 24 VDC supply is delivered together with the Modbus RTU line.

What is the output when supplied with 24 VDC?
In voltage mode the output is 0-10 VDC – no additional limiting is needed.

What is the difference between AT, BT and DC?
AT has an OFF position, BT does not, DC has a dry contact for an external device.

Is it suitable for AC fans?
Not directly; it can provide a 0-10 V command to an electronic controller, e.g. EVS-1.

Potentiometer for EC fan with dry contact | Sentera Controls | SDP-M010-DC

Sentera SDP-M010-DC – potentiometer for EC fans with dry contact and Modbus RTU: 24 VDC (PoM), 0-10 VDC / 0-20 mA / PWM output, Vmin / Vmax setting via Modbus, dry contact 1 A, IP44 / IP54.

Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

Attributes

Manufacturer

Sentera controls

CE certificate – a guarantee of safety, quality, and compliance

This product is marked with the CE label, which confirms that it complies with all applicable European Union directives and regulations. CE marking is not just a formality – it is an important indicator of quality and safety, ensuring that the product has been properly assessed, tested, and can be safely used throughout the EU market.

CE certification means that the product has been evaluated according to the main criteria:

Safety requirements – ensures that the product does not pose a risk to the user or the environment
Electromagnetic compatibility (EMC) – the device does not interfere with other equipment and is resistant to external disturbances
Environmental standards – complies with current ecological and material usage requirements
Operational reliability – the product is suitable for long-term use according to its intended purpose

CE marking allows this product to:

be legally supplied and used in all European Union countries
ensure a high level of quality and safety
be used in residential, commercial, and industrial environments

The CE mark is a declaration of the manufacturer’s responsibility, confirming that the product complies with all applicable standards and has been assessed according to EU legislation.

What does this mean for you as a buyer?

Safe use in everyday activities
Reliable performance and reduced risk of failure
Compliance with EU standards and requirements
Suitability for professional solutions

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Products catalog

Product Catalog

Potentiometer for EC fan with dry contact | Sentera Controls | SDP-M010-DC

Potentiometer for EC fan with dry contact | Sentera Controls | SDP-M010-DC

Operating principle

Technical specifications

Manufacturer documentation

Main functions

Where is it used?

On-demand operation

Application guide: how it is used in practice

How to select the controller current

Pros

Cons / limitations

Safety and installation notes

Quick selection guide

FAQ

Potentiometer for EC fan with dry contact | Sentera Controls | SDP-M010-DC

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