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A crane-control refurbishment project at Clydeport’s Hunterston terminal relies on Parker SSD AC890 series system drives to deliver pinpoint control in the unloading of coal from vessels.

The crane can lift up to 36 tonnes of coal in a single grab, allowing loads to be deposited reliably and accurately into the dockside hopper, even in harsh weather conditions.

The solution needed to be able to integrate seamlessly with the existing Ward Leonard field-control system, and provide regenerative braking with an active front end (AFE) tied to the dock power supply.

The tender was won by Stockport-based system integrator T and M Machine Tools, with owner Tom Yates developing a control system built around Parker SSD AC890 series drives with AFE technology for regenerative braking.

Each of the crane’s legs has four 37kW motors.

The control solution developed by Yates divides these into eight paired sets, each under the control of an AC890 drive.

The control panel itself was built for Yates by the systems department at Parker SSD’s Littlehampton facility, which also provided full engineering support for the wider upgrade project.

Yates worked closely with Parker SSD to develop the AFE regenerative braking system, with the full regenerative operation giving the crane drivers pinpoint joystick control of the traverse movement of the crane.

Parker Hannifin – Electromechanical and Drives

Parker Hannifin is the world’s leading diversified manufacturer of motion and control technologies and systems, providing precision-engineered solutions for a wide variety of mobile, industrial and aerospace markets. With a comprehensive portfolio of electromechanical actuators, servo motors, servo drives, operator displays, communications devices and variable speed AC and DC drives, the Electromechanical and Drives Division are uniquely placed to meet all of your motion control and drives requirements.

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