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TRIOL AT24 Strong Drive

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Triol AT24 SD

Distinctive benefits

-40 ºC…+50 ºC

Operating temperature

IP21 \ IP54


Removable graphic terminal

Operation without control terminal

Input circuit breaker and DC link


Control system

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


3 different types of encoders supported

Motor parameters

Auto-tuning of both with and without motor rotation

Multi-motor systems

Master-Slave drive application

Remote control terminal

Transient graphs


Quick start and the ability to exchange settings between VFDs

About product

Premium solution for powerful motors

Variable Frequency Drive Triol AT24 line SD is a premium solution for powerful motors. Floor mounting for easy installation. Triol AT24 VFD line SD is a low-width and high cabinet with module design and a wide range of built-in options. Removable power cell of high-power Triol AT24 VFD line SD allows performing repair work without dismantling the entire cabinet. A convenient and elaborate system for lifting power cells allows easy installation. Easily removable air filters allow performing periodic maintenance in minutes without stopping and disconnecting supply voltage from Triol AT24 VFD line SD. IP54 enclosure is optional.

Wide range of application

The Master-Slave drive application is available for Triol AT24 VFD line SD for operation in multi-motor systems. For powers 500..800 kW (680…1080 HP) at 380/480 V and 1000..1600 kW (1360…2175 HP) at 690 V, a parallel connection of two Triol AT24 VFD line SD is used. Triol AT24 VFD line SD is optionally equipped with a removable wireless control graphic terminal with induction supply. It is possible to control several VFDs. AT24 SD is designed to control pumps, HVAC systems, exhausters, compressors, conveyors, crushers, mixers, grinders, mills, rolling mills, drilling rigs.

Various additional units

Setting up and controlling the AT24 SD 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. Various additional units for VFD control system extend abilities of process control.


Input voltage, V 3х380 / 3х480/ 3x690 (-15 % ...+10 %)
Input frequency, Hz 50 / 60 (-5 %...+5 %)
Output current, A 176 ...1600
Output frequency, Hz 0...400
Frequency resolution, Hz 0.1
Acceleration / deceleration time, s 1 ...4000
Overcurrent characteristics 150 % of rated value for 60 sec
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 Coasting
Acceleration / deceleration types S-curve, linear (3 reference points)
Terminal Removable graphic terminal with induction power
Light alarm "Ready"; "Run";" Fault", "Control channel"
Push buttons "Start"; "Stop"; "Program", navigation keys
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 1 Dl Emergency Stop 8 Dl programmable
Discrete inputs type 24 V
Sensor input 1 PTC sensor (switching at a resistance of 3 kOhm / 1.8)
Number of relay outputs 4
Relay outputs type 250 V, 3.5 A
Number of analog inputs 2
Analog inputs Programmable 0...10 V / 0...5 mA / 4...20 mA
Number of analog outputs 1
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




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
Circuit breaker Built-in
DC-link Built-in
Input line choke Option, built-in, set instead DC-link
Braking IGBT-chopper Option, built-in
Input EMC filter (C2) Option, built-in
Output dV/dt filter

380/480 V    

Up to 400 kW: option, built-in  From 500 kW: built-in   

690 V 

Up to 800 kW: option, built-in  From 1000 kW: built-in   

Optional equipment
Input passive harmonic filter Option, outdoor, by request
Braking resistors Option, outdoor, by request
Output sine filter Option, outdoor, by request
Mechanism for lifting power cells Option, outdoor, by request
Operating conditions
Operating conditions Indoor, no caustic and volatile air, no dust
Operating temperature -40...+50 °C (-40...+122 °F)
Storage temperature -50...+60 °C (-58...+140 °F)
Relative humidity, % from 5 to 90 non condensing
Altitude, m up to 1000 m - rated power above 1000 m - with reduced power
Protection degree of Enclosure IP21 or IP54
Cabinet material Steel
Cooling Forced air
Noise level, @ 1 m, dB(A) <75
Installation Floor mounting
Maintenance One-side


  • 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)
  • PID-controller
  • 2-wire control
  • 3-wire control
  • Automatic restart
  • “Catch on the fly” mode
  • Motor group control
  • Operation by calendar
  • Energy and electricity meters
  • Encoders supported – incremental, absolute, sine/cosine
  • Accelerated passing of resonant frequencies (3 ranges)
  • Recording the last 32 reasons of failures