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  • New item   -63.51€Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM
    New item   -63.51€Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM 1
    New item   -63.51€Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM 2
    New item   -63.51€Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM 3
    New item   -63.51€Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM 4

    Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM

    Code: GTE21-60-DM
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  • Product description

    Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM

    GTE21-60-DM – a Sentera Controls electronic temperature-controlled fan speed controller for AC motors fed with single-phase 230 VAC up to 6 A, with a Modbus RTU (RS485) interface. Temperature setting 5–35 °C, measured with an external PT500 sensor (not included in the kit), connection – via terminals.

    Key idea:
    A stand-alone temperature controller that can be connected to a BMS or the SenteraWeb cloud: the fan speeds up as the temperature rises, and the status and parameters can be monitored and changed remotely via Modbus RTU. The setting range starting from 5 °C allows ventilation to be controlled in cooler rooms too – warehouses, basements, greenhouses in spring and autumn.
    Max. motor current
    6 A
    Temperature setpoint
    5–35 °C, PT500 sensor
    Communication
    Modbus RTU (RS485)
    Protection
    IP54, supply 230 VAC

    Operating principle

    Connect the 230 VAC power supply (L, N), the motor to connector P5, the external PT500 sensor (not included) to GND and T (TEMP.), and the Modbus RTU line to A and /B (the NBT line termination resistor is disconnected at the factory). The unregulated 230 VAC output L1 (up to 2 A) can power a damper actuator or another 230 V device.

    The controller electronically varies the motor voltage between Vmin (80–160 VAC, external potentiometer) and Vmax (170–230 VAC, internal trimmer). While the temperature is below the setpoint (5–35 °C by potentiometer), the fan runs at minimum speed or, with the OFF level enabled by jumper JP5, switches off; above the setpoint, the speed increases within a proportional band of 2, 4 (factory), 6 or 8 °C (JP1/JP2), with a hysteresis of 0.5, 1, 2 (factory) or 3 °C (JP3/JP4).

    Result – the fan runs according to temperature, and via Modbus RTU the parameters and status are accessible from a BMS or SCADA (register table – in a separate Sentera document), while through the Sentera internet gateway – SenteraWeb: remote settings changes, data logging, alerts, day / night modes. Engineer's note: when voltage is reduced on an AC induction motor, rotor losses increase, so the savings are smaller than with an EC fan or a frequency converter; if the motor hums at low speed, choose a GTH series transformer speed controller with sinusoidal voltage.

    Benefits GTE21-60-DM?
    Temperature-based speed control and Modbus RTU in a single IP54 housing – ventilation can be integrated into a BMS or SenteraWeb without additional controllers.

    Technical specifications

    Product type Electronic temperature-controlled fan speed controller
    Manufacturer / code Sentera Controls / GTE21-60-DM
    Series GTE (GTE-1-60 / GTE21-60, DT and DM versions)
    Version DM – with Modbus RTU, terminal connection
    Supply voltage 230 VAC ±10 %, 50–60 Hz, single-phase
    Max. motor current (Imax) 6 A
    Min. output voltage (Vmin) 80–160 VAC, external potentiometer
    Max. output voltage (Vmax) 170–230 VAC, built-in trimmer
    Unregulated output (L1) 230 VAC, max. 2 A
    Temperature setpoint 5–35 °C, potentiometer
    Temperature sensor External PT500 (not included)
    Proportional band 2 / 4 (factory default) / 6 / 8 °C, jumpers JP1/JP2
    Hysteresis 0.5 / 1 / 2 (factory default) / 3 °C, jumpers JP3/JP4
    OFF level Enabled / disabled with jumper JP5 (factory setting – disabled)
    Communication Modbus RTU (RS485, A, /B); NBT line-end resistor (disconnected from the factory)
    SenteraWeb Via the Sentera internet gateway
    Connection Terminals L, N, L1, GND, T, A, /B; motor – connector P5
    Housing RABS V0, grey RAL 7035
    Protection class IP54, indoor use only
    Operating environment 0…+40 °C, < 95 % rH non-condensing
    Packaging dimensions 220×128×108 mm
    Weight 0.835 kg net / 0.927 kg gross
    Compliance LVD 2014/35/EU, EMC 2014/30/EU (EN 61000-3-2, EN 61000-6-2, EN 61000-6-3), RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • Modbus RTU – status and settings are accessible from the BMS / SCADA.
    • Speed according to temperature – as the temperature rises above the setpoint, the fan speeds up smoothly.
    • Adjustable proportional band and hysteresis – jumpers adjust how quickly the fan responds to temperature.
    • Min. and max. speed – Vmin 80–160 VAC with a potentiometer, Vmax 170–230 VAC with a trimmer – speed and noise are limited to suit the site.
    • OFF level – optionally, the fan switches off when the temperature is below the setpoint.
    • Unregulated 230 V output (up to 2 A) – for a damper actuator or another 230 V device.
    • SenteraWeb – via a Sentera internet gateway – remote control, data logging, notifications and day / night modes.

    Where is it used?

    • Greenhouses
    • Ventilation systems with temperature control
    • Livestock and poultry housing
    • Workshops, warehouses, technical rooms
    • Sites with BMS / SCADA or SenteraWeb monitoring
    • Cooler rooms and seasonal ventilation (setpoint from 5 °C)

    On-demand operation

    For agricultural automation integrators.
    Modbus RTU and SenteraWeb allow several barns or greenhouses to be monitored from a single point.
    For cool warehouse ventilation designers.
    Setpoint from 5 °C and day / night modes via SenteraWeb.
    For the electrical installer connecting with terminals.
    Terminals L, N, L1, GND, T, A, /B and the P5 connector – neat fixed installation.

    Practical application

    If ventilation in a vegetable store has to intensify when the temperature exceeds 6 °C, and the farmer wants to see the data remotely, then the GTE21-60-DM with an external PT500 is set to 6 °C, and via a Sentera internet gateway the data, warnings and day/night modes are available in SenteraWeb.

    Application guide: how it is used in practice

    Typical GTE21-60-DM applications:

    Site What is connected Result Installer's note
    Greenhouse Fan → P5; PT500 → in the plant zone As the temperature rises, the fan speeds up; when it is cooler, it runs at minimum speed or switches off Install the sensor in shade, not in direct sunlight
    Poultry house / livestock room Extract fan up to 6 A Temperature-based ventilation is maintained, with the minimum air exchange level held at Vmin Leave the OFF level (JP5) disabled if continuous minimum ventilation is required
    Fan with air damper Damper actuator 230 VAC → L1 The damper is powered together with the controller L1 load – up to 2 A
    Workshops, warehouse Extract fan On a hot day extraction increases Increase the proportional band (6–8 °C) if the speed changes too abruptly
    Site with BMS / SenteraWeb Modbus RTU → A, /B Status and settings remotely Connect the NBT resistor on the last device in the line

    How to select the controller current

    Rated current of the motor(s) Recommended model
    up to 6 A · setpoint 15–35 °C · plug-in, with PT500 GTE-1-60-DT (6 A)
    up to 6 A · setpoint 15–35 °C · Modbus RTU GTE-1-60-DM (6 A)
    up to 6 A · setpoint 5–35 °C · plug-in, with PT500 GTE21-60-DT (6 A)
    up to 6 A · setpoint 5–35 °C · Modbus RTU GTE21-60-DM (6 A) ← this model
    Rule: the controller's max. current ≥ the rated current of the motor (or the sum of several motors) from the motor nameplate. The starting current has already been taken into account by the manufacturer, no extra margin is needed. When connecting several fans – of the same type, AC motors with voltage control – add up their rated currents. All GTE models are 6 A; choose by temperature range and version (DT / DM).
    When to choose another solution: for a different temperature setting range (15–35 °C) – GTE-1-60-DM; plug-in version with a PT500 sensor – GTE21-60-DT; sinusoidal voltage and a water heater valve – transformer GTH-1 / GTH21 series; electric heater – GTTE1 series; control by a 0-10 VDC signal – EVS-1 series; for EC fans – EC controllers with a 0-10 VDC output.

    Pros

    • Modbus RTU and SenteraWeb
    • Automatic speed control according to temperature
    • Adjustable proportional band and hysteresis
    • Min. and max. speed are set
    • Unregulated 230 V output (2 A)
    • IP54 enclosure

    Cons / limitations

    • PT500 sensor not included
    • Single-phase voltage-controllable AC motors only; not suitable for EC fans
    • Controlled only by ventilation logic – speed increases as temperature rises
    • Indoor use only, operating environment 0…+40 °C; no TK terminals or alarm output
    • No sinusoidal voltage – for sensitive motors choose the GTH series

    Safety and installation notes

    • Installation and connection must be carried out by a qualified electrician with the power disconnected.
    • At the end of the Modbus line, enable the NBT resistor only on the last device.
    • Check that the motor is suitable for voltage control and that its (or several motors') rated current does not exceed 6 A.
    • The unregulated L1 output load – no more than 2 A.
    • Intended for indoor use only: 0…+40 °C, < 95 % rH non-condensing.

    Quick selection guide

    6 A
    230 VAC
    5–35 °C
    Modbus RTU
    IP54
    Suitable when you need:
    • for temperature-based ventilation with an AC fan up to 6 A;
    • for greenhouse and farm building microclimate control;
    • integration into a BMS or SenteraWeb via Modbus RTU;
    Check before use:
    • the motor rated current and whether it is voltage-controllable;
    • whether the temperature setting range of 5–35 °C is suitable;
    • whether you have a PT500 sensor (purchased separately);
    Important reminder: The GTE21-60-DM does not control EC fans, three-phase motors and heaters – it only changes the fan speed according to temperature.

    FAQ

    Is the sensor included?
    No, the DM version requires an external PT500 sensor, connected to the GND and T terminals.
    When does the fan speed up?
    When the temperature exceeds the set value (within 5–35 °C); the speed increases over a proportional band of 2–8 °C.
    Can the fan switch off completely?
    Yes, if the OFF level is enabled with jumper JP5; it is disabled at the factory and the fan runs at minimum speed.
    Can several fans be connected?
    Yes, if their total rated current does not exceed 6 A and the motors are voltage-controlled.
    How does it differ from GTE-1-60-DM?
    The GTE-1-60-DM temperature setting range – 15–35 °C; other parameters are the same.
    How does it differ from GTE21-60-DT?
    GTE21-60-DT – plug-in version with a PT500 sensor, Schuko socket and power cable, but without Modbus RTU.

    Electronic temperature-controlled fan speed controller | Modbus RTU | 5-35°C | 6A | 230VAC | IP54 | Sentera Controls | GTE21-60-DM

    Sentera GTE21-60-DM – electronic temperature-controlled fan speed controller, up to 6 A, 230 VAC, setpoint 5–35 °C, Modbus RTU, SenteraWeb, IP54 – for greenhouses and temperature-based 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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