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TRIOL AT24 line UB

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TRIOL AT24 line UB

Distinctive benefits

Control type

Vector sensorless (open-loop) control

Motor parameters




Multi-stage speed control

16 steps

4 parameter sets

Acceleration and deceleration time

About product

Simple, reliable and cost-effective solution

Variable Frequency Drive Triol AT24 line UB is a basic solution for common process tasks with simple installation, quick commissioning and easy operating. AT24 UB is simple, reliable and cost-effective solution to control pumps and HVAC systems. The integrated terminal allows making settings without additional equipment and service software.


Input voltage, V 3х380 / 3х480/ 3×690 (-15 % …+10 %)
Input frequency, Hz 50 / 60 (-5 %…+5 %)


Output current, A 1.2 … 110
Output frequency, Hz 0.5…400
Frequency resolution, Hz 0.1
Acceleration / deceleration time, s 1 …36000
Overcurrent characteristics 120 % of rated value for 60 sec
Efficiency, % >97

Motor control

Control methods V/f (volts-per-hertz) (5 reference point) sensorless vector control (open-loop) sensor vector control (close-loop)
PWM frequency, kHz 2…10
Speed range 1:100 in open-loop system 1:1000 in closed-loop system
Speed accuracy (static) ±10% of motor nominal slip in open-loop system ±0.1 % of rated speed in close-loop system
Torque accuracy ±10% in open-loop system ± 5 % in close-loop system
Braking By frequency



Acceleration / deceleration types S-curve, linear (3 reference points)


Terminal Integrated seven-segment
Light alarm “Ready”; “Run”; “Control channel”, “Rotation”
Push buttons “Start”; “Stop”; “Fast access “

Control signals

Customer supply 10 V DC, up to 30 mA 24 V DC, up to 150 mA
Number of discrete inputs 7
Discrete inputs 2 Dl “Direction of rotation” by default 4 Dl programmable 1 Dl high speed pulse input
Discrete inputs type 24 V
Number of relay outputs 2
Relay outputs type 250 V, 1 A
Discrete output 1 DO high speed or open collector
Number of analog inputs 2
Analog inputs 1 Al 0…10 V by default  1 Al programmable 0…10 V or 0…5 mA or 4…20 mA
Number of analog outputs 2
Analog outputs Programmable 0…10 V or 0…5 mA or 4…20 mA


Physical Interface 2 wire RS-485 for Modbus
Communication protocols Modbus RTU
Frame transmission 19200 bps by default  1200, 2400, 4800, 9600,19200, 38400 bps
Data format 8 bits, 1 stop bit, no parity
Number of addresses 1…247 for Modbus
Access Slave


Supply protections Phase loss
Motor protections Overload Phase loss
VFD protections Overload, Overheating, DC-link undervoltage, DC-link overvoltage, Power switch failure
Insulation Galvanic isolation between power and user circuits
Insulation resistance >1 MQ


Braking IGBT-chopper Up to 15 kw: built-in From 18 kW: option, built-in

Optional equipment

Braking resistors Option, outdoor, by request
Input line choke Option, outdoor, by request
Input EMC filter (C2) Option, outdoor, by request
Output dV/dt filter Option, outdoor, by request


Protection degree of Enclosure IP21
Cabinet material Up to 7.5 kw: plastic From 11 kW: steel
Cooling Forced air
Noise level, @ 1 m, dB(A) <75
Installation Wall mounting
Maintenance One-side
Cable entry Bottom

Operating conditions

Operating conditions Indoor, no caustic and volatile air, no dust
Operating temperature -10…+40 °C (-10…+104 F)
Storage temperature -40…+50 °C (-40…+122 F)
Relative humidity, % from 5 to 90 non condensing
Altitude, m up to 1000 m – rated power above 1000 m – with reduced power


  • Start / stop / reverse of motor with set acceleration and deceleration rates
  • Auto-tuning of motor parameters
  • PID-controller
  • 2-wire control
  • 3-wire control
  • Automatic restart
  • Accelerated passing of resonant frequencies (2 ranges)
  • Simple PLC and multi-step speed control with 16 steps and 4 acceleration / deceleration times
  • Recording the last 3 reasons of failures