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Short-circuiting of the drive windings limits the acceleration and speed of the cabin in the event of manual emergency release. An electronic solution for this helpful function is unique on the market! In combination with the STO function, the ZAdyn4Bplus is the only frequency inverter on the market that allows elevator machines with rated currents > 80 A to allow completely contactorless operation!
Elimination of the motor contactors and short-circuit contactors, which are very costly due to the high currents, ensures significantly lower material and manufacturing costs for the elevator control.
