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TRIOL AT24 line UH

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vfd hvac, automation technology, manufacturing automation, frequency drive, vfd pump

Distinctive benefits



-40 ºC…+50 ºC

Operating temperature

Removable graphic terminal

Operation without control terminal


input fuses and DC link

Control type

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


3 different types of encoders supported

Motor parameters

auto-tuning of motor parameters with motor rotation and without it


Motor group control

Remote control terminal

Transient graphs


Quick start and the ability to exchange settings between VFDs

Control system

wide variety of expandable units for control system

About product

High-protective enclosure

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 a 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.

Wide range of implemetation

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


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


Output current, A 8.8 … 800
Output frequency, Hz 0.5…400
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 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 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


Input line chlnput fuses (characteristic gG) Up to 55 kW: not available. From 75 kW: built-in
DC-choke Up to 11 kW: option, built-in. From 15 kW: built-in
Braking IGBT-chopper Up 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 choke Option, outdoor, by request
Input passive harmonic filter Option, outdoor, by request
Braking resistors Option, outdoor, by request
Output sine filter Option, outdoor, by request
Output dV/dt filter 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 IP55
Cabinet material Steel
Cooling Forced air
Noise level, @ 1 m, dB(A) <75
Installation Wall mounting
Maintenance One-side
Cable entry Bottom


  • 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