FSDrive-MV1000 3373 views
The compact design realized by developing thin power cells with three-level single phase output, and adopting a simple circuit configuration, a draw-out control panel and thin cooling fans, has resulted in a significant volume reduction of 30 to 60% when compared to the conventional Yaskawa product. The unit can even fit in a standard container for transportation∗.
Everything has been done to achieve a small footprint, especially for 3 kV class drives (800 kVA or less), with the transformers located in the bottom of the panel and the power cells and controller at the top.
Power cells can be replaced and maintained individually. The construction designed for single-action mounting and removal reduces the replacement time and facilitates maintenance operations.
Open Loop Vector control enables smooth acceleration from a low-speed range without using a speed detector. Operation is stable, unaffected by fluctuations in load. The high performance vector control drives synchronous motors as well as induction motors.
• Starting Characteristics
• Running Multiple Motors
The capability to run multiple induction motors in parallel with a single drive can reduce the size of the system as a whole.
FSDrive-MV1000 continues to operate for a number of cycles∗1 when a momentary power loss occurs, and re-accelerates to the reference speed immediately after the power is restored to ensure a smooth system start-up.
• Speed Search Function
• KEB Function∗2
Yaskawa's original smart harmonics technology incorporated in FSDrive-MV1000 drastically cuts input harmonics. The resulting input waveform is sinusoidal, making it possible to clear the harmonics control guideline specified by the Ministry of Economy, Trade and Industry, and by IEEE519-1992, as an individual drive. This means that no harmonics filter or active filter is necessary.
(Conducted a harmonics test in the presence of an authority from a global certification organization.)
• Measured Harmonics in Input Current
(For 3.3 kV, 630 kW, 60 Hz, full-load contract demand of 630 kW)
• Easily Applicable to Existing Motors
PWM control with multiple outputs connected in a series outputs sinusoidal wave voltage.
This has the following benefits:
• Free from oscillation surge voltage affecting the motor
• Low torque ripple, easing the load
• Noise as low as commercial power supply operation
These benefits make it possible to use the existing motors and wiring cables without adding filters or other modifications.
• Input Waveform
• Output Waveform
Line-to-Line Voltage (for 6 kV Class Drives)
Since FSDrive-MV1000 is a direct medium-voltage drive that does not need an output transformer, it can maintain a power conversion efficiency of approximately 97% over a wide speed range and secure a power supply factor of 0.95 (at rated load), avoiding energy wastage.
• Power Conversion Efficiency Ratio
The shaft power of wind and hydraulic machines such as fans, blowers, and pumps is proportional to the cube of the rotational speed.
Since drives maintain high efficiency even at low speed, a significant energy saving effect can be expected by using drives for wind and hydraulic machines and operating them at lower speeds.
• Example: Calculation Formulae for Energy Saving Effects with Fans and Blowers
• Power Consumption Characteristic Curve
A Digital Operator with an easy-to-view LCD display (the same as used on Yaskawa's 1000 series low-voltage drives) is provided on the front panel as standard, making it easy to operate and set the drive.
The engineering tool DriveWizard Plus MV enables consolidated management of the parameters for each drive and makes for easy adjustment and maintenance.
The RS-485 communication function (MEMOBUS/Modbus protocol) is installed as standard. By adding an optional communication card, the major field network protocols can be supported. Achieve centralized control of production equipment and fewer connecting cables by connecting the drive to host computer or PLC.
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