Electric wire rope hoists - ABUS - #19

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19 Moving on up. crane systems Electronic motor control systems The AZS electronic smooth starting unit from ABUS, which is equally well-suited for crane and trolley travel, minimizes jolting during acceleration. The patented ABUS SU smooth switching relay is triggered each time the unit is switched from high to low speed, ensuring a significant reduction in the braking torque caused by operation of the motor as a generator and minimizing load swing. The smooth starting unit and the smooth switching relay work harmoniously in combination, making for extremely convenient operation. ABULiner frequency converter The ABULiner, a microprocessorcontrolled frequency converter unit, allows infinitely variable speed control. When fitted to a cross travel drive, the ramps set ensure smooth acceleration and deceleration. The ramp is adapted to the load to prevent large loads from swinging. Electric emergency lowering system for hoist motors The emergency lowering system ensures that the load can be lowered safely even in the event of a power supply failure. If the mains power supply is interrupted, the operator can initiate controlled lowering by pressing the “lowering” button on the pendant control. The lowering operation can be stopped at any point. During emergency lowering, power for the motor brake is supplied by a battery. To prevent uncontrolled lowering, one winding of the pole change motor is operated as a generator. Electronic synchronization control system The electronic synchronization control system compensates for differences in the speeds of several hoists operated together as a result of different loads. The patented unit controls two or more hoists in synchronized operation with a minimum of effort, without switching off the faster-running motor in main lifting speed. The electronic synchronization control If an ABULiner is fitted to a hoist motor, the motor can be operated at up to twice the rated maximum lifting speed, depending on the actual load (this function is optional). This feature permits significant time savings, especially on systems with large hook paths. The acceleration ramp and the braking ramp can be set separately. For applications requiring extremely low lifting speeds, such as toolmaking and mould production, the ABULiner can be installed in such a way as to operate only on the precision lifting speed. With this version, infinitely variable speed control is only possible if the precision lifting speed is selected. system can be fitted inexpensively to standard hoists driven by pole change motors. No mechanical modifications or additional electronic components are needed. Differences in the levels of the lifting height are easily compensated by individual operation of the hoists before the system is switched to synchronized-speed operation. Time-consuming adjustment of the length of the individual load lifting tackles is therefore no longer necessary. Further options on request