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Variable Frequency Drive Triol AT24 line LE

Variable Frequency Drive AT24 line LE is designed to control a synchronous and asynchronous, gear and gearless elevator winches. Triol AT24 VFD line LE is specially designed to ensure safe and reliable operation of elevator equipment and has advanced functionality for modern elevators. Programmable inputs and outputs allow configuring Triol AT24 VFD line LE to operate with any type of Variable Frequency Drive.

Triol AT24 VFD line LE is able to work with three types of encoders (incremental, absolute, sine/cosine) without the use of additional units. Unique Triol algorithms of sensor and sensorless vector control, algorithms of specialized lift functionality, slip compensation, anti-rollback algorithm are implemented in Triol AT24 VFD line LE.

Automatic measurement of motor parameters makes the setting process of Triol AT24 VFD line LE easy and precise. The function of measuring parameters without the need for motor rotation becomes indispensable when the elevator car is already mounted.

Operation with UPS ensures reliable power supply and elevator operation.

Setting up and controlling Triol AT24 VFD line LE 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
  • vector sensor (close-loop) and sensorless (open-loop) control
  • 3 different types of encoders supported
  • any kinds of winches
  • slip compensation algorithm
  • anti-rollback algorithm
  • programmable discrete inputs
  • working from UPS
  • auto-tuning of motor parameters with motor rotation and without it
  • 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, A11 … 74
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 graphic
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-chopperBuilt-in
Wi-Fi unitOption, built-in

Optional equipment

Remote control P24EOption, outdoor
Braking resistorsOption, outdoor
Input line chokeOption, outdoor
Input EMC filter (C2)Option, outdoor
Output dV/dt filterOption, outdoor


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
  • Motor speed and torque control
  • Auto-tuning of motor parameters (with rotation and without)
  • 3-wire control
  • Start-up torque compensation (analog input)
  • Anti-rollback algorithm
  • STO function
  • Slip compensation
  • Control of input contactor
  • Control of winch brake
  • 15 preset speeds for motion settings (for digital inputs)
  • Automatic restart
  • Encoders supported – incremental, absolute, sine/cosine
  • Accelerated passing of resonant frequencies (3 ranges)
  • Recording the last 32 reasons of failures