Answer Drives GT3000 - GT3000 Overview and Installation Flowchart; 1.2 Notes about Control Modes

IMGT30017EN 1
Chapter 1A GT3000 - OVERVIEW AND INSTALLATION FLOWCHART
1A.1 Overview
GT3000 drives have been designed for a wide range of applications and allow for the constant adjustment of motor speed. The GT3000 drives
are extremely compact, reliable, cost-effective, efficient and easy to use, and available for a wide range of three-phase motors. The state of the
art digital control allows extensive programming options.
The GT300 LARGE is developed for A.C. or D.C. power supply
GT3000 drives are suitable for single or multi-motor applications with asynchronous motors. Examples include the following:
• Pumps – centrifugal, positive displacement, proportional Fans – forced and induced draft, centrifugal, axial, evaporators
• Mixers, agitators Conveyors, conveyor belts, and packaging machines
• Winders – films, paper, wire Centrifuges
• Extruders – melt pumps, pelletizers Compressors
• Machinery for paper, steel, and textile industries Lifts, elevators, cranes and hoists.
They are available with 6 pulse (K), or 12 pulse (P), or 18 pulse (R) harmonic distortion, or AFE control.
Harmonic Comparison of a Typical 160 KW PWM 6, 12 and 18 pulse VFD vs. the GT3000 with Active front end operating from a 220KVA
5,75% impedance source.
Total Harmonic
Distortion
6-PULSE Harmonic
Waveform
12-PULSE Harmonic
Waveform
18-PULSE Harmonic
Waveform
ACTIVE FRONT END
(CURRENT) 30,1% 6,5% 2,5% 1%
(VOLTAGE) 8,1% 5,2% 2,9% 2,2%
1A.2 Notes about control modes
SCALAR CONTROL (V/F) SENSORLESS CONTROL (without encoder) VECTOR CONTROL (FOC) (with encoder)
Voltage frequency regulation with
constant or variable ratio variable
Independent torque and flow control
(= DC motor)
Independent torque and flow control
(= DC motor)
Voltage boost Good static and dynamic performance Excellent static and dynamic performance
Open-loop operation Closed-loop operation (simulated) Closed-loop operation
Limited speed regulation range: 1:15 Speed regulation range: 1:50 Speed regulation range: 1:1.000
Speed resolution: 1:1.000 Speed resolution: 1:5.000
Slip compensation Typical static speed accuracy: 0.2 x fslip
(speed control range 5 - 100%: < 0.2 %)
(speed control range below 5%: ≈ 1 %)
Static speed accuracy: 0.01 %
Output current control Torque control Torque control also at zero speed
Torque control response: < 5 ms Torque control response: 5 ms
Typical applications
Fans, centrifugal pumps, conveyor
belts, conveyors, roller conveyors
Extruder, presses, positive-displacement pumps Hoisting and lifting equipment, shearing machines,
coordinated devices