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Variable Frequency Drive Triol AT24 line UС

Variable Frequency Drive Triol AT24 line UС is an intelligent frequency drive for operating processes with high overload ability.  There are all the advantages of Triol unique vector control algorithm implemented in Triol AT24 VFD line UC. Connecting three different types of encoders provides increased control accuracy to operate in a closed-loop system.

Triol AT24 VFD line UC is designed for controlling pumps, HVAC systems, exhausters, compressors, conveyors, crushers, mixers, grinders, mills.

Setting up and controlling of Triol AT24 VFD line UC is easy due to the use of:

  • Wi-Fi adapter with step-by-step Triol Wizard via smartphone
  • Service software Triol Drive for PC
  • Remote control terminal with transient graphs

Distinctive benefits of Variable Frequency Drive Triol AT24 line UС:

  • Investment savings
  • Cost saving
  • vector sensor (closed-loop) and sensorless (open-loop) control
  • 3 different types of encoders supported
  • auto-tuning of motor parameters with motor rotation and without it
  • motor group control
  • remote control terminal with transient graphs
  • settings via smartphone
  • service software


Input voltage, V3х380 / 3х480/ 3×690 (-15 % …+10 %)
Input frequency, Hz50 / 60 (-5 %…+5 %)


Output current, A6.4 … 110
Output frequency, Hz0.5…400
Frequency resolution, Hz0.1
Acceleration / deceleration time, s1 …4000
Overcurrent characteristics150 % of rated value for 60 sec
Efficiency, %>97

Motor control

Control methodsV/f (volts-per-hertz) (5 reference point) sensorless vector control (open-loop) sensor vector control (close-loop)
PWM frequency, kHz2…10
Speed range1:100 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
BrakingBy frequency



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


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

Control signals

Customer supply10 V DC, up to 30 mA 24 V DC, up to 150 mA
Number of discrete inputs8
Discrete inputsProgrammable
Discrete inputs type24 V
Number of relay outputs4
Relay outputs type250 V, 1 A
Discrete output2 open collector
Number of analog inputs2
Analog inputsProgrammable 0…10 V / 0…5 mA / 4…20 mA
Number of analog outputs2
Analog outputsProgrammable 0…10 V / 0…5 mA / 4…20 mA


Physical Interface2 wire RS-485 for Modbus
Communication protocolsModbus RTU
Frame transmission115200 bps by default 1200 -250000 bps
Data format8 bits, 1 stop bit, no parity
Number of addresses1…255 for Modbus


Supply protectionsPhase loss, phase sequence fault
Motor protectionsOvercurrent



Phase loss

Current unbalance

Encoder open circuit

Brake resistor open circuit

VFD protectionsOverload, Overheating, DC-link undervoltage, DC-link overvoltage, Power switch failure
InsulationGalvanic isolation between power and user circuits
Insulation resistance>1 MQ


Braking IGBT-chopperUp to 15 kw: built-in From 18 kW: option, built-in
Wi-Fi adapterOption, built-in

Optional equipment

Input line chokeOption, outdoor, by request
Input passive harmonic filterOption, outdoor, by request
Braking resistorsOption, outdoor, by request
Output sine filterOption, outdoor, by request
Output dV/dt filterOption, outdoor, by request


Protection degree of EnclosureIP21
Cabinet materialUp to 7.5 kw: plastic From 11 kW: steel
CoolingForced air
Noise level, @ 1 m, dB(A)<75
InstallationWall mounting
Cable entryBottom

Operating conditions

Operating conditionsIndoor, 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, mup 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 (with rotation and without)
  • PID-controller
  • 2-wire control
  • 3-wire control
  • Automatic restart
  • “Catch on the fly” mode
  • Motor group control
  • Operation by calendar
  • Encoders supported – incremental, absolute, sine/cosine
  • Accelerated passing of resonant frequencies (3 ranges)
  • Recording the last 32 reasons of failures