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Variable Frequency Drive Triol AT24 line SD

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. 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.

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.

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.

  • IP21 (optional IP54)
  • Operating temperature -40 ºC…+50 ºC (-40…+122 F)
  • Floor mounting
  • Module design
  • Film capacitors
  • Removable graphic terminal, operation without control terminal
  • Built-in input circuit breaker
  • Built-in DC link
  • Parallel connection for high power
  • Vector sensor (close-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
  • Master-Slave drive application for multi-motor systems
  • Remote control terminal with transient graphs
  • Settings via smartphone
  • Service software
  • Macros for quick start and the ability to exchange settings between VFDs
  • Wide variety of expandable units for control system


Input voltage, V3х380 / 3х480/ 3×690 (-15 % …+10 %)
Input frequency, Hz50 / 60 (-5 %…+5 %)
Output current, A176 …1600
Output frequency, Hz0…400
Frequency resolution, Hz0.1
Acceleration / deceleration time, s1 …4000
Overcurrent characteristics150 % of rated value for 60 sec
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 Coasting
Acceleration / deceleration typesS-curve, linear (3 reference points)
TerminalRemovable graphic terminal with induction power
Light alarm“Ready”; “Run”;” Fault”, “Control channel”
Push buttons“Start”; “Stop”; “Program”, navigation keys
Control signals
Customer supply10 V DC, up to 30 mA 24 V DC, up to 150 mA
Number of discrete inputs8
Discrete inputs1 Dl Emergency Stop 8 Dl programmable
Discrete inputs type24 V
Sensor input1 PTC sensor (switching at a resistance of 3 kOhm / 1.8)
Number of relay outputs4
Relay outputs type250 V, 3.5 A
Number of analog inputs2
Analog inputsProgrammable 0…10 V / 0…5 mA / 4…20 mA
Number of analog outputs1
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
Circuit breakerBuilt-in
Input line chokeOption, built-in, set instead DC-link
Braking IGBT-chopperOption, built-in
Input EMC filter (C2)Option, built-in
Output dV/dt filter380/480 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 filterOption, outdoor, by request
Braking resistorsOption, outdoor, by request
Output sine filterOption, outdoor, by request
Mechanism for lifting power cellsOption, outdoor, by request
Operating conditions
Operating conditionsIndoor, 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, mup to 1000 m – rated power above 1000 m – with reduced power
Protection degree of EnclosureIP21 or IP54
Cabinet materialSteel
CoolingForced air
Noise level, @ 1 m, dB(A)<75
InstallationFloor mounting
  • 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