AKD™ Installation Manual - TG Drives

AKD Installation | 8 Electrical Installation8.13.2 Motor Holding Brake (X2)A 24 V holding brake in the motor can be controlled directly by the drive.The brake only works with sufficient 24 V voltage level (see page 36 or see page37). Check voltage drop, measure the voltage at brake input and check brakefunction (brake and no brake). This function does not ensure personnel safety.The brake function must be enabled through the motor brake. The diagram below shows the timing and functionalrelationships between the Enable signal, speed setpoint, speed, and braking force. All values can beadjusted with parameters; values in the diagram are default values.During the internal ENABLE delay time of 40 ms (CS.DEC), the speed setpoint of the drive is internally drivendown an adjustable ramp to 0 V. The output for the brake is switched on when the speed has reached 5 rpm(CS.VTHRESH), at the latest after 5 s (CS.TO). The rise (t brH) and fall (t brL) times of the holding brake that isbuilt into the motor are different for the various types of motor (see motor manual). Operation of the brake in amanner that provides personnel safety requires an additional “make” contact in the brake circuit and a suppressordevice, such as a varistor, for the brake circuit. The recommended circuit is shown below:96 Kollmorgen | December 2009