Triol AT 08 variable frequency drive (voltage 660 V)
The all-purpose variable frequency drive intended for driving mining machines or other electric motors with supplied voltage 660 V.
Purpose:
The Triol AT08 variable frequency drive is intended for controlling machines and mechanisms based on three-phase asynchronous electric motors with the following parameters:
- Supply voltage – 660V;
- Power range – from 110 to 630 kW.
Features implemented in the Triol AT08:
- Optimized algorithms of high-frequency PWM-control;
- Laws of frequency regulation of the asynchronous electric motor; and
- Scalar control.
The Triol AT08 variable frequency drives are able to operate in both manual and automatic modes.
The Triol AT08 variable frequency drive is an efficient solution with respect to technological tasks for the automatic controlling efficiency of machines and mechanisms. This drive saves energy, resources and prolongs the operable lifetime of your equipment.
The Triol AT08 frequency converter is commonly used with:
- Compressors;
- Electrical mine hoists;
- Conveyors and transporters;
- Mine pumps and fans;
- Open-mine excavators; and
- Rock-drilling machines.
The specifications of the Triol AT08 variable frequency drives are represented in the following table:
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Power range:
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from 110 to 630 kW
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Main supply:
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3x660 V, +10%, –15%, 50 (60) Hz ± 2%
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Output voltage:
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3x(0…660 V) ± 2%
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Output frequency:
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0…50(100) Hz ± 0.05%
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Overload current:
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120% of rated current during 60 s
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Efficiency (without motor):
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0.97 or more
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Power factor (of electric mains)
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0.95 or more
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Insulation resistance between circuits not connected galvanically.
Insulation resistance between circuits and chassis.
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10 MOhm or more
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Electric strength of insulation:
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4000 V, 50 Hz during1 min
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Environmental conditions:
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Operational temperature:
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+1 …+40 °C
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Air humidity (without condensation)
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up to 90%
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Index of protection
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IP21 or IP54 (optionally)
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The device has several inputs and outputs in order to receive controlling and reference signals and also to control external devices. The inputs and outputs are listed below:
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Quantized inputs
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Quantity – 6
Type of signal – "dry contact "
Load resistance – 2 kOhm
Current – from 10 to 20 mA
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Analog inputs
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Quantity – 2 (up to 6 on customers request)
Voltage – from 0 to 10 V
Current – from 0 (4) to 20 mA
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Programmable relay outputs
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Quantity – 2 (up to six on customers request)
Type of signal – "dry contact "
Voltage – 250 V
Current – 0.3 A
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Analog outputs
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Quantity – 2
Voltage – from 0 to 10 V
Current – from 0 (4) to 20 mA
At the client’s request, a sub-unit of analog inputs is delivered
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Channels of serial communication via the RS485 interface
(Data exchange is supported through the RS485 interface, in correspondence to the “Modbus” protocol)
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Quantity – 1
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The different types of the Triol AT08 variable frequency drives are outlined in the table below:
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Type of Triol AT08 variable frequency drive
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M20
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M25
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M32
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M40
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M63
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Rated power, kVA
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260
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340
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420
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525
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835
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Rated power of electric motor, kW
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200
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250
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320
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400
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630
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Rated load current Ir, A
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230
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300
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370
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460
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730
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Dimensional sizes, mm
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800х1500х450
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1200х2000х850
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Modes of operation
The Triol AT08 variable frequency drives are able to operate in both the manual and automatic modes.
the drive processes the output frequency value, which has been set via the control console or automated control system. The rotation frequency of electric motor is thereby controlled.
The frequency is regulated in a closed loop system. The control is implemented in two ways: - By using an embedded PID control. This approach is based on signals from feedback sensors (speed sensor, sensor of process-dependent parameter, etc.);
- By using a mathematical model of the controlled process (without sensors).
Variants of parameter settings and controlling drive’s operation in manual mode are described below:
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Local control
is implemented by:
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Remote control
is implemented by:
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Embedded control console
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Remote control console
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External automated control system or PC via channels of serial communications
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Discrete (quantized) or analog signals from external automated control station
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The control console of the Triol AT08 is equipped with a graphic LCD, light indication and comfortable keyboard.
Functional features are as follows:
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Main
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Additional
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Controlling asynchronous motor operation in every mode:
Start by preset algorithm;
Long-term operation in a preset range of rotation and loading frequencies;
Reversal motion;
Dynamic breaking with energy dissipation through brake resistors; and
Shutdown.
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Remote receipt and processing of control signals, setting parameters and modes (including via serial communication channels from controlling machines and high level systems)
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Controlling process variables by means of PID control
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Signaling, displaying and remote transmission of information about parameters and operation modes
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Protection of frequency converter, asynchronous motor and mechanisms at emergency conditions
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Calculation of hours worked
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Registration of refuses, off-nominal and emergency modes
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Triol AT08-M63. Front view
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