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Variable Frequency Drive Triol AT24 line MP

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.

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
  • IP21 (optional IP54)
  • Operating temperature -20 ºC…+50 ºC (-4…+122 F)
  • Floor mounting
  • Module design
  • Interchangeable power cells
  • Film capacitors
  • Removable graphic terminal, operation without control terminal
  • Built-in input circuit breaker
  • Built-in input line choke
  • Built-in output dV/dt filter
  • 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, A300 … 600
Output frequency, Hz0.5…100
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)


TerminalRemovable graphic terminal with induction power
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 inputs1 Dl Emergency Stop 8 Dl programmable
Discrete inputs type24 V
Number of relay outputs1 PTC sensor (switching at a resistance of 3 kOhm / 1.8)
Relay outputs type4
Discrete output250 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
Insulation resistance>1 MQ


Circuit breakerBuilt-in
Input line chokeBuilt-in
Input EMC filter (C2)Option, built-in
Output dV/dt filterBuilt-in
Common mode chokeOption, built-in


EnclosureIP21 (IP54 by request)
Cabinet materialSteel
CoolingForced air
Noise level, @ 1 m, dB(A)<75
InstallationFloor mounting
Cable entryBottom

Operating conditions

Operating conditionsIndoor, 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, 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)
  • 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