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  • New item   -56.63€Digital modular fan speed controller | Modbus RTU | 2.5A | 230VAC | DIN rail | Sentera Controls | DRE-1-25-DT
    New item   -56.63€Digital modular fan speed controller | Modbus RTU | 2.5A | 230VAC | DIN rail | Sentera Controls | DRE-1-25-DT 1
    New item   -56.63€Digital modular fan speed controller | Modbus RTU | 2.5A | 230VAC | DIN rail | Sentera Controls | DRE-1-25-DT 2

    Digital modular fan speed controller | Modbus RTU | 2.5A | 230VAC | DIN rail | Sentera Controls | DRE-1-25-DT

    Code: DRE-1-25-DT
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  • Product description

    Digital modular fan speed controller | Modbus RTU | 2.5A | 230VAC | DIN rail | Sentera Controls | DRE-1-25-DT

    DRE-1-25-DT – Sentera Controls digital modular DIN rail fan speed controller: 9 speed steps, LED display, three buttons and Modbus RTU. Controls single-phase voltage-controllable AC motors up to 2.5 A.

    Key idea:
    Stepped speed control in the control panel with clear indication: the display shows the selected step (0–9), and the same can be controlled from the BMS via Modbus RTU.
    What it is for DRE-1-25-DT:
    This model is designed for medium-power fans (up to 2.5 A) – duct fans in offices, classrooms, retail premises or 2–3 smaller fans together.
    Max. motor current
    2.5 A
    Control
    3 buttons / Modbus RTU
    Power supply
    230 VAC ±10 %, 50–60 Hz
    Installation
    DIN rail, IP30

    Operating principle

    The controller is mounted on a DIN rail. Connect the power supply (L, N), the motor (U1, U2), the unregulated output (L1) and, if required, the Modbus RTU line (A, /B).

    Speed is changed by varying the motor supply voltage in 9 steps between the set min. (30–65 % Us) and max. (75–100 % Us) limits. The step is selected with the ▲/▼ buttons and shown on the 7-segment display.

    Normal or inverse mode and fast or slow start-up are selectable. Settings can also be changed via Modbus RTU with the 3SModbus software.

    Engineer's note: with an AC induction motor, reducing the voltage increases rotor losses, so the savings are lower than with an EC fan or a frequency inverter; when completely silent operation at low speed is essential, choose a transformer controller with a sinusoidal output voltage.

    Benefits DRE-1-25-DT?
    Digital, precisely repeatable speed setting in the control panel (steps 0–9) and Modbus integration in one small DIN module.

    Technical specifications

    Product type Digital modular fan speed controller
    Manufacturer / code Sentera Controls / DRE-1-25-DT
    Supply voltage 230 VAC ±10 %, 50/60 Hz
    Max. motor current 2.5 A
    Regulated output 30–100 % Us, 9 steps
    Min. / max. limit 30–65 % Us (~70–150 VAC) / 75–100 % Us (~170–230 VAC)
    Unregulated output (L1) 230 VAC, max. 0.5 A
    Control 3 buttons (▲, OK, ▼), 1-digit 7-segment LED display
    Modes Normal / inverse; fast / slow start
    Communication Modbus RTU (RS485), 3SModbus software
    Indication Operation LED, Modbus LED, display
    Protection class IP30 (EN 60529)
    Operating environment 0…+35 °C, 0–80 % rH non-condensing
    Installation DIN rail (EN 60715), indoor use only
    Cables Up to 2.5 mm²
    Dimensions 96 × 94 × 40 mm
    Weight 0.13 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

    • 9 speed steps – precisely repeatable setting – the step number is visible on the display.
    • Buttons and display – settings are changed directly in the control panel.
    • Modbus RTU – the step and status are controlled from the BMS.
    • Min. / max. limits – the motor does not run at too low a voltage, and the speed does not exceed the permissible level.
    • Inverse mode and start-up – adapted to the specific system.
    • Unregulated L1 output – for a lamp or a small load up to 0.5 A.
    • SenteraWeb – via the Sentera internet module, the controller can be connected to the SenteraWeb cloud – remote control, monitoring and alerts via the internet.

    Where is it used?

    • Ventilation and automation control panels
    • Office and retail ventilation with stepped control
    • Buildings with BMS (Modbus RTU)
    • Plant rooms

    On-demand operation

    For the panel builder.
    Compact DIN module with display.
    For the BMS integrator.
    Modbus RTU – step control from a central system.
    For maintenance staff.
    Clear step number on the display.

    Application guide: how it is used in practice

    Typical DRE-1-25-DT applications:

    Site What is connected Result Installer's note
    Ventilation control panel Fan → U1, U2 Speed is set with buttons in 9 steps Set the min. limit to suit the motor
    Building with BMS Modbus RTU → A, /B BMS changes the step and monitors the status In a Modbus network with AC power supply, do not connect the GND terminal to other devices or to the CNVT-USB-RS485 converter – this may damage the communication electronics.
    Indication Lamp → L1 You can see that the fan is running L1 load – up to 0.5 A

    How to select the controller current

    Rated current of the motor(s) Recommended model
    up to 2.5 A DRE-1-25-DT (2.5 A) ← this model
    Rule: controller max. current ≥ motor rated current (see the motor nameplate). The starting current is already accounted for by the manufacturer; no additional margin is needed. When connecting several fans – motors of the same type – add up their rated currents. For higher currents in a control panel – MVS-1 series (up to 10 A).
    When to choose another solution: for smooth control with a 0-10 VDC signal – MVS-1 series; for simple manual control in a control panel – DRX-1 series; for an EC fan – an EC controller.

    Pros

    • 9 steps and display
    • Modbus RTU
    • Adjustable limits
    • Inverse mode
    • Compact DIN module

    Cons / limitations

    • Current up to 2.5 A
    • No 0-10 VDC input
    • IP30 – in control panel only
    • Operating temperature up to +35 °C
    • The output voltage is non-sinusoidal – some motors may hum audibly at low speed

    Safety and installation notes

    • Installation and connection must be carried out by a qualified electrician with the power disconnected.
    • Check that the motor is suitable for voltage control and that its current does not exceed 2.5 A.
    • In a Modbus network with AC power supply, do not connect the GND terminal to other devices or to the CNVT-USB-RS485 converter – this may damage the communication electronics.

    Quick selection guide

    2.5 A
    230 VAC
    9 steps
    Modbus RTU
    DIN rail
    Suitable when you need:
    • stepped speed control in a control panel;
    • Modbus integration;
    • clear indication.
    Check before use:
    • the motor current;
    • whether the motor is voltage-controllable;
    • the control panel temperature (up to +35 °C).
    Important reminder: DRE-1-25-DT does not control EC fans or three-phase motors.

    FAQ

    How many speed steps?
    9 steps (0–9), shown on the display.
    Can it be controlled via Modbus?
    Yes, Modbus RTU (RS485), configuration with 3SModbus software.
    Is there a 0-10 V input?
    No, for that choose the MVS-1 series.

    Digital modular fan speed controller | Modbus RTU | 2.5A | 230VAC | DIN rail | Sentera Controls | DRE-1-25-DT

    Sentera DRE-1-25-DT – digital DIN rail fan speed controller, 9 steps, display, Modbus RTU, up to 2.5 A, 230 VAC.

    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.

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