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TRIOL AT24 line MP

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TRIOL AT24 line MP

Distinctive benefits

-20 ºC…+50 ºC

Operating temperature

IP21 \ IP54


Removable graphic terminal

Operation without control terminal


Input circuit breaker, input line choke, output dV/dt filter

Control system

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


3 different types of encoders supported

Motor parameters

Auto-tuning both with or 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

Wide range of application

Modular Variable Frequency Drive Triol AT24 line MP is designed for controlling multi-motor systems that are used on powerful industrial plants, such as conveyors, rolling mills, drilling rigs, developed in compact dimensions.

Enhanceed enclosure

Triol AT24 VFD line MP basic configuration is IP21 enclosure. It is possible to advance Triol AT24 VFD line MP to IP54 enclosure with external air filter that is designed according to unique technology for successful operation in certain environmental conditions if requested. Triol AT24 VFD line MP consists of three separate modules, where each module has its own control system: rectifier cabinet (thyristor\diode or active), inverter cabinet, brake unit cabinet


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


Output current, A 300 … 600
Output frequency, Hz 0.5…100
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 Removable graphic terminal with induction power
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 1 Dl Emergency Stop 8 Dl programmable
Discrete inputs type 24 V
Number of relay outputs 1 PTC sensor (switching at a resistance of 3 kOhm / 1.8)
Relay outputs type 4
Discrete output 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 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


Circuit breaker Built-in
Input line choke Built-in
Input EMC filter (C2) Option, built-in
Output dV/dt filter Built-in
Common mode choke Option, built-in


Enclosure IP21 (IP54 by request)
Cabinet material Steel
Cooling Forced air
Noise level, @ 1 m, dB(A) <75
Installation Floor mounting
Maintenance One-side
Cable entry Bottom

Operating conditions

Operating conditions Indoor, no caustic and volatile air, no dust
Operating temperature -20…+50 °C (-4…+122 F)
Storage temperature -40…+60 °C (-40…+140 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)
  • 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