Adjustable Frequency Drives for Crane Controls

Magnetek Inc., Menomonee Falls, Wis., has introduced its new Impulse Series 4 adjustable frequency drives, which can be used as an open-loop vector or V/F crane control for traverse motions or mechanical load brake hoists. The Series 4 drives incorporate innovative new safety and control features including Load Check II, which continuously detects hoist overload conditions throughout the frequency range, halting upward motion and only allowing the load to be lowered, said Dan Beilfuss, director of sales.

The new Adaptive Ultra-Lift feature, for which the company has a patent pending, allows for hoist operation above base speed with a light load or empty hook. It continuously monitors motor torque and adjusts motor speed to operate at peak performance, improving plant safety and maximizing throughput. Safe Torque Off is another new feature that provides a redundant hardware safety circuit that guarantees motor and brake power are removed when an emergency stop switch or safety controller opens the drive input, eliminating the need for external disconnects.

"We are excited to provide our customers with the advanced technology of the Series 4 line of crane controls and want to remind them that every Impulse drive is backed by Magnetek’s unsurpassed three-year warranty," said Beilfuss.