Near perfection claimed for servo

The new MR-J2 Super with power ratings of 50W-7kW, is based on Mitsubishi Electric's highly successful MR-J2 servo series.

The new MR-J2 Super with power ratings of 50W-7kW, is based on Mitsubishi Electric's highly successful MR-J2 servo series.

The new Super series takes the customer information learned from users of the standard series and has put this intimate knowledge into the new Superseries, to provide the automation industry with a near perfect servo drive.

To achieve this in the new series, Mitsubishi Electric had to design and manufacture a range of new high performance CPUs.

These new CPUs enable the drive to achieve the highest possible speed of response and performance targets that had been set by the design engineers.

The use of these new special processors make it possible to more than double the gain crossover frequency of the Super servo drives series from 250 to 550Hz, permitting extremely short cycle periods resulting in outstanding speed of response.

Choice of the new materials did not stop at the processor.

Mitsubishi Electric used only semiconductor components with computer-optimised heat dissipation characteristics, enabling the servo drive to be manufactured in an extremely compact form without heat build up problems.

Reduction in positioning periods was also taken into consideration to eliminate additional delays in movement sequences, with the timing reduced from 5ms in the MR-J2 to 0.9ms in the MR-J2 Super.

The Super series are ideal for operating on axes with high inertias and frictions and for designs with low inherent mechanical rigidity.

The new servo has improved communications capabilities with additional RS-422/RS-485 port enabling a multi-drop mode of up to 32 stations.

Open networking support is also now available for all major Open Fieldbus networks including CC-Link.

One of the amplifier's permanent functions is real-time auto-tuning, which continuously monitors the control parameters and adjusts them automatically to match current conditions.

This auto-tuning function delivers genuine automatic continuous adjustment with optimum performance for virtually the entire range of servo applications, including suspended loads and high friction applications.

Vibration reduction is another of the servo amplifier's permanent online functions.

The specially developed active vibration suppression system (AVSS) automatically determines the resonance point and stops vibration escalation.

When vibration is detected the component values are calculated directly from the feedback signal and suppressed with a filter.

The vibration damping value is also calculated and adjusted automatically, eliminating the inaccuracies that are possible with conventional vibration suppression systems which use preset parameters.

The AVSS even detects shifts in the resonance point caused by load fluctuations and system warming-up phenomena, which are automatically identified and corrected by the system.

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