Triol AT24 variable frequency drive
       The low-voltage drive for controlling asynchronous and brushless DC motors.

General Description


       Purpose:
       to control induction (asynchronous) or brushless DC motors with variable or constant load torque requirements; the delivered power ranges from 5.5 to 400 kW.

       Applications:

  • Elevators;
  • Pumps;
  • Fans;
  • Conveyors; and
  • Compressors.

Main Features:

Scalar or flux vector control with or without a speed sensor The Triol AT24 is a universal drive that can be used for motors with variable or constant torque load. To achieve this, the Triol AT24 offers options with scalar control algorithms that are typically used for centrifugal pumps, fans and compressors. Options with flux vector control algorithms are specially designed for elevators and conveyors; this algorithm works perfectly with or without a speed sensor.

 

Motor parameter measurement at standstill Allows measuring motor parameters while the load is connected without the need for affixing the mechanical shaft.

 

Reduces power consumption Various operating modes optimize the motor operation:
  • The “sleep” mode stops the motor if the pressure in the pipeline has reached it maximum value at the minimum preset output frequency;
  • The “current optimization” changes the output voltage to achieve the minimum full load current at the fixed output frequency.

 

DC injection braking Makes it possible to quickly brake the motor by applying DC voltage to the motor windings.

 

Rotation direction and speed control by analog input Controls the direction of the shaft’s rotation and speed in accordance with the analog input value. This function is useful in pumping applications, where precise pressure needs to be maintained using feedback from an analog pressure sensor.

 

Cascade controller up to 4 pumps One frequency drive can control up to four motors by directly rotating one motor and turning the other motors supplied from the grid on and off. The Triol AT24 can switch its output to other motors.

 

Wall and floor mounting The Triol AT24’s construction allows it to be mounted on the wall or set on the ground.

 

Evacuation mode for elevators In the case of supply voltage disturbances, the VFD is capable of driving the elevator’s motor to the nearest floor.

 

“Catch on the fly” mode This mode enables the motor to start while the shaft’s freewheeling rotation is present. The Triol AT24 starts rotating the motor in a freewheeling direction and speed, smoothly changing them to the needed rotation parameters.

 

 Monitoring motor insulation resistance The Triol AT24 constantly monitors the motor’s insulation resistance. For pumping applications, the Triol AT24 can dry the motor with DC voltage in the case that the insulation resistance is lower than the current level.


If you need to install several Triol AT24 drives with the same settings, you only need to set them on one drive and transfer the settings to other VFDs using the control panel.

Specifications


       Triol AT24 technical specification

 

Nominal power

5.5 …400 kW

Supply voltage

3 x 380 V (- 15%, + 10%), 50/60 Hz (± 2%)

Nominal output voltage

3 x 0…380 V (± 2%)

Output frequency

0…400 Hz for asynchronous motors (± 0.1%)
0…500 Hz for brushless DC motors (± 0.1%)

Overload current

120% of nominal current for 60 seconds

Efficiency

> 95%

Operating mode

Continuous

Insulation resistance

> 1 mOhm

Interface

RS 485; CAN

Data exchange protocol

Modbus RTU; CANopen; Profibus DP, DeviceNet

Operating temperature

+1 °C … + 40 °C

Protection level

IP00, IP21, IP54 according to IEC 60529

       AT24 model range

Model

Active output power,

kW

Rated output current, A

Total output power,

kVA

Dimensions,

mm

AT24-5k5

5.5

11

7.5

150x305x185

AT24-7k5

7.5

15

10

150x305x185

AT24-11k

11

22

15

150x305x235

AT24-15k

15

30

18

150x305x235

AT24-22k

22

45

28

240x420x235

AT24-30k

30

60

38

240x420x235

AT24-37k

37

75

45

235x515x330

AT24-45k

45

90

56

235x515x330

AT24-55k

55

110

72

250x670x330

AT24-75k

75

150

100

250x800x430

AT24-90k

90

180

120

250x800x430

AT24-M11

110

220

145

250x800x430

AT24-M13

130

260

175

580x950x420

AT24-M16

160

320

210

640x1190x391

AT24-M20

200

400

260

640x1190x391

AT24-M25

250

500

330

640x1190x391

AT24-M32

320

640

400

900x1100x420

AT24-M40

400

800

500

900x1100x420

 

Images

 

Triol AT24-15K. Front view

Triol AT24-15K. Connection of user's inputs and outputs

 

 
AT24

Triol AT24-16K VFD

The Triol AT24 VFDs are intended to control asynchronous or brushless DC motors with; the delivered power ranges from 5.5 to 400 kW.