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Variable Frequency Drive Triol AT24 line UH

Variable Frequency Drive Triol AT24 line UH is a universal solution for harsh operating conditions.

Triol AT24 VFD line UH designed in a high-protective enclosure with separate airflow cooling channel.

Operation temperatures ranges from -40 ºC to +50 ºC (-40…+122 F) and allows using Triol AT24 VFD line UH for outdoor installation.

Triol AT24 VFD line UH is optionally equipped with a removable wireless control graphic terminal with induction supply. It is possible to control several VFDs.

Triol AT24 VFD line UH is designed to control pumps, HVAC systems, exhausters, compressors, conveyors, crushers, mixers, grinders, mills. Various additional units for VFD control system extend abilities of process control.

Setting up and controlling the AT24 UH 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

Distinctive benefits of Variable Frequency Drive Triol AT24 line UH:

  • Investment savings
  • Cost saving


  • IP55
  • operating temperature -40 ºC…+50 ºC (-40…+122 F)
  • film capacitors
  • removable graphic terminal, operation without control terminal
  • built-in input fuses
  • built-in DC link
  • 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
  • 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, A8.8 … 800
Output frequency, Hz0.5…400
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 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
Insulation resistance> 1 MQ


Input line chlnput fuses (characteristic gG)Up to 55 kW: not available. From 75 kW: built-in
DC-chokeUp to 11 kW: option, built-in. From 15 kW: built-in
Braking IGBT-chopperUp to 11 kW: built-in. From 15 kW: option, built-in
Input EMC-filter (C2)Option, built-in
Coated PCB (3C3)Option
Quick fuses (characteristic aR)Option, built-in

Optional equipment

Input line chokeOption, outdoor, by request
Input passive harmonic filterOption, outdoor, by request
Braking resistorsOption, outdoor, by request
Output sine filterOption, outdoor, by request
Output dV/dt filterOption, 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 EnclosureIP55
Cabinet materialSteel
CoolingForced air
Noise level, @ 1 m, dB(A)<75
InstallationWall mounting
Cable entryBottom
  • 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