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Delta: Medium Voltage Drive (MVD2000 Series)
Drives can save an average of 40% of the electricity a motor uses as well as reduce related CO2 emissions. Since industry accounts for one-third of the world's electricity consumption and electric motors consume 65% of industrial electricity in regions such as the EU [1], the potential global energy savings from a wider use of drives would be substantial. For an industrial enterprise drives can reduce energy costs, minimize wear on motors and other equipment, and reduce maintenance costs. A reliable, high-performance drive such as Delta's MVD1000/MVD2000/MVD3000 medium voltage drive can provide an enterprise with greater energy-savings as well as increased productivity.
[1] "Energy Efficient Motor Driven Systems," European Copper Institute, Fraunholfer-ISI, KU Leuven and University of Coimbra (April 2004)
MVD2000 Series The MVD2000 is a medium voltage variable speed drive series for speed and torque control based on advanced frequency-conversion multilevel inverter technologies and advanced vector control algorithms. The MVD2000 is a modular and configurable cost-effective solution that provides efficient and reliable operation across many industrial applications. Simple installation requirements, easy operation and maintenance make the MVD2000 the drive of choice across industrial segments that require energy savings or speed control for constant torque loads over the operating speed range.
MVD2000 delivers high performance control accuracy using vector control. The ability to independently control motor flux and speed yields fast dynamic response to load fluctuations and high torque at low speeds, including during motor start-up.
Both encoder and sensor-less vector control approaches are available for selection. The speed sensors can be installed depending on actual application conditions. For cases without the speed sensors, the system can still provide fast dynamic responses and high output torque when the motor is running at low speed.
Features:
Advanced Technologies
Advanced vector control algorithms with and without speed sensors to enhance motor control performance.
Advanced auto tuning of motor parameters to improve the stability of the vector control.
DC current braking injection.
Power loss ride through, and synchronous transfer for single or several motors.
Coordination and control of master slave variable frequency inverters to meet load sharing application requirements.
Use of phase-shift multi-pulse input transformer to decrease the input grid current harmonics and meet the IEEE 519-1992 requirements.
Use of cascaded multilevel inverter technologies to deliver nearly sinusoidal output voltage waveforms, meeting motor drive requirements for long-distance cables.
Enhanced Process & Quality Control
Capability to produce large output torque at low speeds and during motor startup, increasing speed response and control accuracy within motor torque limits.
Integrated PID controller for precise control on flow, pressure or other process variable.
Control operation under temporary input power loss and capability to restart automatically after grid fault and recovery.
Advanced protection functions such as motor stall and output fault to ground.
Friendly customer interface for easy system integration with customerâs process.
Control and Monitoring Functions
Speed command (rpm)
Operating speed (rpm)
Input/output power, current, voltage
Accumulated running time
MVD status
System bypass switches and user breaker status
Programmable analog I/Os
Alarms and faults
Event recording
Lower Cost of Ownership
System efficiency is higher than 98%, which decreases system operating costs (excluding phase shift transformer).
Optimized blower and water pump operations to ensure energy saving and shorten the investment recovery period.
Integration of input transformer allows three-cable-in-three-cable out reduced installation engineering effort.
Smooth speed control decreases mechanical stress, eliminates pipe-hammer effect and reduces maintenance costs.
Multilevel output voltage and controlled starting currents reduce motor stress.
Synchronous transfer switchgear cabinet for soft starter applications for single or multiple motors.
Protection Functions
Over-current protection
Over-load protection
Transformer high-temperature alarm & over-temperature protection
MVD over-temperature protection
Under-voltage & over-voltage protection
Motor over-load protection (external protection relay connection)
Cooling fan abnormal alarm
Cabinet door open protection
Cabinet pressure alarm
Output short-circuit protection
Input/output phase loss protection
Communication failure protection
Output grounding protection
Motor stall alarm/protection
Motor reverse rotation alarm/ protection
Over-speed and under-speed alarm/protection