Inverter drives can control drives in cranes – in applications such as shipyards, harbours, production and assembly halls and warehouses – very effectively. This applies to lifting and lowering loads, as well as moving the trolley and bridge. For both financial and safety reasons, this solution presents special requirements for the drive technology. In addition to actually moving loads, drive technology is also used to release the brakes, optimise cycle times based on the loads being moved or synchronise multiple movements.
For these applications, YASKAWA offers a special drive package, designed to meet the specific requirements of crane operation and based on the tried and tested A1000 series inverter drives. Devices are available for drives with an output of up to 300 kW. They can operate all standard induction motors, with or without a speed sensor.
A particular advantage of YASKAWA’s A1000 inverter drives for crane applications is the versatile yet simple parameter setting process for short commissioning times. The auto-tuning function optimises engine control for the connected motor in less than a minute. The remaining functions can be quickly and effectively adapted to the individual requirements of each crane. One of the features enables you to adjust the response of the drive or the brakes during and after error messages to control the display of error messages, waiting periods until they are acknowledged or waiting periods until the drive is activated. Similarly, the connection to primary crane controls can be adjusted using numerous parameters. There are digital and analogue inputs, outputs and network interfaces available for data communication, including CANopen, Profibus and Ethernet.
The outstanding features include application-specific functions for safe and economical crane operation. For example, the brake controls can optimise the timing of the brakes opening and closing. while also monitoring the speed, torque and motor current of the lift drive. This reliably prevents the brakes from opening in case of an overload or an interrupted motor circuit – for example, due to faulty cables or magnetic contactors. Slipping brakes are also detected and reported. There are numerous special functions available for economical and highly dynamic crane operation with short cycle times. For example, the drive automatically optimises the crane’s lifting and lowering speeds using the Ultra Lift function, taking into account the measured torque, as well as motor and inverter output. The highest possible lifting and lowering speeds are selected, thus minimising cycle times and ensuring extremely cost-effective crane operation.
Naturally, YASKAWA offers additional components for crane applications, such as brake choppers, regenerative resistors, inductors and EMC filters. The drive specialists at YASKAWA support crane manufacturers and operators with everything from the configuration of components and commissioning of systems to the integration of specific functions.