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TRIOL AT24 line LE

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electrical automation, low voltage system, elevator drive, ac tech drives

Distinctive benefits

Control system

Vector sensor (close-loop) and sensorless (open-loop)


3 different types of encoders supported

Special algorithms

Slip compensation and anti-rollback algorithms

Motor parameters

Auto-tuning both with and without motor rotation

Remote control terminal

Transient graphs

About product

Safe and reliable operation

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.

Unique algorithms

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 algorithms are implemented in Triol AT24 VFD line LE.

Automatic measurements

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 a 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


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


Output current, A 11 … 74
Output frequency, Hz 0.5…400
Frequency resolution, Hz 0.1
Acceleration / deceleration time, s 1 …4000
Overcurrent characteristics 150 % 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 graphic
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 8
Discrete inputs programmable
Discrete inputs type 24 V
Number of relay outputs 4
Relay outputs type 250 V, 1 A
Discrete output 2 open collector
Number of analog inputs 2
Analog inputs programmable 0…10 V / 0…5 mA / 4…20 mA
Number of analog outputs 2
Analog outputs Programmable 0…10 V / 0…5 mA / 4…20 mA


Physical Interface 2 wire RS-485 for Modbus
Communication protocols Modbus RTU
Frame transmission 115200 bps by default 1200 -250000 bps
Data format 8 bits, 1 stop bit, no parity
Number of addresses 1…255 for Modbus
Access Slave


Supply protections Phase loss, phase sequence fault
Motor protections Overcurrent



Phase loss

Current unbalance

Encoder open circuit

Brake resistor open circuit

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 Built-in
Wi-Fi unit Option, built-in

Optional equipment

Remote control P24E Option, outdoor
Braking resistors Option, outdoor
Input line choke Option, outdoor
Input EMC filter (C2) Option, outdoor
Output dV/dt filter Option, outdoor


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
  • 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