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  •   Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM
      Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM 1
      Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM 2
      Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM 3
      Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM 4

    Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM

    Code: EVSS1-15-DM
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  • Product description

    Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM

    EVSS1-15-DM – Sentera Controls electronic speed controller with motor thermal protection (TK) terminals and an alarm output, for single-phase voltage-controllable AC fan motors up to 1.5 A. Speed is changed by varying the motor supply voltage within 30–100 % Us, with the command coming from an analogue 0-10 VDC / 0-20 mA signal or via Modbus RTU.

    Key idea:
    This is a controller without a knob – it is designed for automation. Its speed is dictated by a sensor, controller, BMS or potentiometer, so the ventilation can run based on CO₂, temperature, pressure or time, rather than on how far someone has turned a knob.
    What it is for EVSS1-15-DM:
    This model is designed for low-power fans (up to 1.5 A) – one or two duct or axial fans in an office, bathroom, kitchen or small room.
    Max. motor current
    1.5 A
    Control
    0-10 VDC / 0-20 mA / Modbus RTU
    Power supply
    230 VAC ±10 %, 50–60 Hz
    Protection
    IP54, surface mounting

    Operating principle

    The controller is mounted on a wall or structure next to the fan or in a plant room. Connect the 230 VAC power supply, the motor (U1, U2), the control signal to the Ai input and, if required, the Modbus RTU line (A, /B), and the motor thermal contacts to the TK terminals.

    Electronic (semiconductor) control: the effective (RMS) value of the motor supply voltage is varied, so the output voltage is not purely sinusoidal. Us – supply voltage (230 VAC).

    On receiving a 0-10 VDC or 0-20 mA signal (direction and type are selected with DIP switches), the controller varies the output voltage between the minimum (30–70 % Us, trimmer VR2) and maximum (75–100 % Us, trimmer VR1) limits. Trimmer VR3 sets the switch-off level – below it the motor stops. Settings can also be changed via Modbus RTU.

    Result – the fan runs at exactly the speed required and consumes less electricity than when running continuously at full speed. Engineer's note: with an AC induction motor, reducing the voltage increases slip and rotor losses, so the savings are lower than with an EC fan or a frequency inverter. When energy efficiency is the top priority, choose an EC fan; when completely silent operation at low speed is essential, choose a transformer controller with a sinusoidal output voltage.

    Benefits EVSS1-15-DM?
    One device combines analogue control, Modbus RTU integration, remote start / timer, an unregulated 230 V output, an illuminated switch and soft / fast start, while the TK terminals with alarm output make motor overheating visible.

    Technical specifications

    Product type Electronic fan speed controller with TK
    Manufacturer / code Sentera Controls / EVSS1-15-DM
    Series EVSS1 (1.5 / 3 / 6 / 10 A)
    Supply voltage 230 VAC ±10 %, 50–60 Hz
    Max. motor current 1.5 A
    Regulated output (U1, U2) 30–100 % Us (69–230 VAC), RMS
    Min. / max. output limit 30–70 % Us / 75–100 % Us (trimmers VR2 / VR1 or Modbus RTU)
    Unregulated output (L1) 230 VAC, max. 2 A
    Analogue input (Ai) 0-10 / 10-0 VDC or 0-20 / 20-0 mA (DIP switches)
    Switch-off level 0–4 VDC / 0–8 mA (increasing mode), 10–6 VDC / 20–12 mA (decreasing mode)
    Potentiometer supply (+V) +12 VDC / 1 mA (for an external 10 kΩ potentiometer)
    Remote start (SW) Yes, as well as timer mode (pulse ≥30 ms)
    Motor thermal protection (TK) TK terminals for motor thermal contacts; overheating is indicated by a red LED and the alarm output
    Alarm output 230 VAC, 1 A
    Communication Modbus RTU (RS485), configuration with 3SModbus software; NBT line termination jumper
    Start-up mode Soft (softstart) or fast (kickstart)
    Protection Against overheating, overvoltage and overcurrent; fuses F 0.63 A and F 3.15 A H 250 VAC, 5×20 mm
    Indication Operation LED, Modbus LED, overheating LED (red), illuminated power switch
    Protection class IP54 (EN 60529), for indoor use only
    Operating environment -20…+40 °C, 0–80 % rH non-condensing
    Cables Up to 2.5 mm²; cable glands 3–6 mm and 5–10 mm
    Weight 0.65 kg (net)
    Compliance LVD 2014/35/EU, EMC 2014/30/EU, RoHS (EU) 2015/863

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • Analogue control 0-10 VDC / 0-20 mA – connects directly to CO₂, temperature or pressure sensors or a controller.
    • Modbus RTU – speed, limits and status are controlled and monitored from the BMS or SCADA.
    • TK terminals and alarm output – motor overheating is visible immediately: a red LED on site and a 230 V signal to the BMS, a siren or a lamp.
    • Adjustable min. / max. limits – the minimum limit ensures that the motor always starts and does not stand still while energised, overheating due to too low a voltage; the maximum limit restricts speed and noise.
    • Switch-off level – at a low signal the motor switches off instead of “humming”.
    • Unregulated 230 V output (up to 2 A) – for a damper actuator, valve or indicator lamp without an additional relay.
    • Softstart / kickstart – soft start or reliable run-up at full speed.
    • Timer mode – the fan runs for a set time after a pulse from a push-button or signal.
    • Illuminated switch – clearly visible even in the dark – suitable for basements, garages, hangars.
    • 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?

    • Supply and extract fans with AC motors up to 1.5 A
    • CO₂-based ventilation of offices, schools and halls
    • Temperature- or humidity-based extraction for warehouses, workshops and garages
    • Duct fans with pressure control
    • Buildings with BMS / SCADA where Modbus RTU is required
    • Upgrading ventilation systems by replacing manual controllers

    On-demand operation

    For the ventilation installer.
    One controller suits both simple potentiometer control and sensor-based automation – fewer different products on site.
    For the automation / BMS integrator.
    Modbus RTU allows the status to be read and the settings to be changed from a central system without additional converters.
    For the building administrator.
    Ventilation runs on demand, reducing noise and electricity consumption.

    Application guide: how it is used in practice

    The same EVSS1-15-DM can be used in different projects – only what is connected to its inputs and outputs changes:

    Site What is connected Result Installer's note
    Meeting room, classroom, office CO₂ sensor with 0-10 VDC output → Ai In an empty room the fan runs at min. speed, and speeds up automatically as people arrive Set the min. limit so that the motor rotates reliably
    Warehouse, workshop, garage Temperature sensor with 0-10 VDC → Ai On a hot day extraction increases, on a cool day it drops to the minimum Connect the motor TK contacts – overheating will be signalled via the alarm output
    Duct system with constant pressure Pressure sensor or PI controller with 0-10 VDC / 0-20 mA → Ai As the filter clogs, the speed increases automatically and the pressure is maintained Select the signal type (V / mA) and direction with the DIP switches
    Building with BMS / SCADA Modbus RTU (RS485) line → A, /B Speed, limits and status are controlled centrally; several controllers with different addresses on one line With AC power supply, do not connect the GND terminal to other Modbus devices
    Bathrooms, toilets, smoking rooms Push-button or motion contact → SW (timer mode) After a pulse, the fan runs for the set time and then switches off automatically The timer duration is set via Modbus RTU
    Fan with air damper Damper actuator 230 VAC → L1 output When the fan switches on, the damper opens; when it switches off, the damper closes The L1 load (up to 2 A) is counted together with the motor current
    Simple manual control External 10 kΩ potentiometer (e.g. Sentera SDP-X10K-NA) → +V, Ai, GND Speed is set by the operator; later you can switch to a sensor without replacing the controller With wires up to 2.5 mm²

    How to select the controller current

    Rated current of the motor(s) Recommended model
    up to 1.5 A EVSS1-15-DM (1.5 A) ← this model
    1.5–3 A EVSS1-30-DM (3 A)
    3–6 A EVSS1-60-DM (6 A)
    6–10 A EVSS1100-DM (10 A)
    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. The load on the unregulated L1 output (up to 2 A) is counted together with the motor current.
    When to choose another solution: for DIN rail mounting in a control panel – MVSS1-15CDM; for an EC fan – an EC potentiometer or a controller with 0-10 VDC output; for a three-phase motor – a three-phase transformer controller (e.g. STR-4 series) or a frequency inverter; for a motor without TK contacts – the simpler EVS-1 series.

    Pros

    • Analogue and Modbus RTU control in one
    • Adjustable speed limits and switch-off level
    • Unregulated output for a damper or lamp
    • Soft or fast start
    • IP54 enclosure, illuminated switch
    • TK terminals and 230 V alarm output
    • Overvoltage and overcurrent protection

    Cons / limitations

    • No knob – an external potentiometer is required for manual control
    • Only for single-phase voltage-controllable motors; not suitable for EC fans
    • More expensive than EVS-1 – if the motor has no TK contacts, EVS-1-15-DM is sufficient
    • Indoor use only
    • 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 rated current does not exceed 1.5 A.
    • Several fans can be connected to one controller, provided their total current does not exceed 1.5 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.
    • Do not install where the controller would be exposed to direct sunlight or condensation.

    Quick selection guide

    1.5 A
    230 VAC
    0-10 VDC / 0-20 mA
    Modbus RTU
    IP54
    TK + alarm
    Suitable when you need:
    • to control an AC fan up to 1.5 A based on a sensor or controller signal;
    • to integrate the fan into the BMS via Modbus RTU;
    • to control a damper or lamp together with the fan;
    • to protect a motor with TK contacts and receive an overheating alarm.
    Check before use:
    • the motor rated current and whether it is voltage-controllable;
    • the control signal type (voltage or current) and direction;
    • whether the motor has TK contacts (if not, the EVS-1 series is sufficient).
    Important reminder: EVSS1-15-DM does not replace a frequency inverter for three-phase motors and does not control EC fans.

    FAQ

    Can it be controlled manually?
    Yes, by connecting an external 10 kΩ potentiometer to the +V, Ai and GND terminals.
    Is it suitable for EC fans?
    No, EVSS1-15-DM is intended only for single-phase voltage-controllable AC motors.
    Can several fans be connected?
    Yes, provided their total current does not exceed 1.5 A.
    How does it differ from EVS-1-15-DM?
    EVS-1-15-DM has no TK terminals and no alarm output; all other functions are the same.
    How to change the settings via Modbus?
    Via RS485 with the CNVT-USB-RS485 converter and the free Sentera 3SModbus software.
    Can it be installed outdoors?
    No, the controller is intended for indoor use only.

    Electronic fan speed controller with TK | Modbus RTU | 0-10VDC | 1.5A | 230VAC | surface-mounted | IP54 | Sentera Controls | EVSS1-15-DM

    Sentera EVSS1-15-DM controls single-phase AC fans up to 1.5 A based on a 0-10 VDC / 0-20 mA signal or Modbus RTU, and has TK terminals with an alarm output, adjustable speed limits, an unregulated 230 V output and an IP54 enclosure – suitable for automated demand-controlled ventilation.

    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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