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New-generation VSDs support output frequencies to 599Hz
Fuji Electric has launched a VSD (variable-speed drive) with a maximum output frequency of up to 599Hz, supporting applications that need high-speed rotation and minimal speed and torque variations. The Frenic-Mega G2 drives have autotuning functions that allow them to be used with almost any type of induction or synchronous motor, using sensor-based or sensorless vector control.
The G2 drives are the same size as Fuji’s earlier G1 models, allowing direct replacement. Parameters can be read from a G1 and transferred directly to the G2 series in about 30 seconds. The new drives offer up to 4,500 programmable parameters, but most users are expected to rely on preconfigured functions for common applications. Other specifications for the new drives include:
• dynamic torque vector control, with 200% starting torque at 0.3Hz;
• the “highest torque responsiveness to sudden load changes in its class”, minimising variations in rotational speed and suppressing vibrations;
• built-in braking resistors;
• precision positioning control with eight positioning data points for pulse string inputs;
• an orientation function that allows machinery to be held in position via servo-locking after a stoppage;
• a PID autotuning function for quicker start-ups, and simpler adjustment of proportional and integral gains;
• a load limiter that improves reliability by stopping when it detects excessive torque;
• customisable logic functions with up to 260 steps, that avoid the need for a PLC;
• the ability to use up to three comms cards for different protocols;
• a built-in RS-485 terminal, as well as RJ-45, simplifying multi-drop connections;
• a choice of multi-function keypads with LED or LCD displays and enhanced diagnostic functions, with optional memory card slots and Bluetooth support;
• the ability to monitor the drive via a PC or the keypad, reducing the need for maintenance and downtime;
• the ability to store alarm histories including waveform data from before the alarms;
• a ten-year design life, with warranties of three or five years;
• IP55 protection for the drives’ rear cooling system, enhancing cooling outside of control panels, cutting costs and saving space; and
• support for European safety standards.
The new drives are available 200V versions up to 110kW and 400V versions up to 710kW.
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