123Brake engage timeParameter DescriptionThis parameter determines how long the drive will maintain fullcurrent and control of the motor after the direction inputs, X2A.14and X2A.15 have been turned off. After the adjusted time, motorcurrent will continue to flow, however the analog input will beclamped and the speed control gains will be reduced. This timeshould be adjusted longer than the actual required time for thebrake to mechanically drop.Note: when using digital speed selection the selected speedinput must be turned off before or at the same time as thedirection input is turned off. When using analog or serial speedcontrol, the command speed should be brought to zero beforeturning off the direction signal.Unit: secondsValue range: 0.00 … 3.00 SecondsDefault setting: 0.50 SecondsCurrent hold timeOnce the time in LF.78 has expired, current will continue flowingto the motor, but the drive will ramp the motor torque down to zeroover the time adjusted in LF.79. This provides a smooth transitionof the load to the brake and a quiet de-energization of the motor.This time should be adjusted such that the drive shuts off thecurrent before the controller drops the drive enable (X2A.16) andopens the motor contactor. If the drive enable is dropped beforethe current is shut off, it is possible the drive will respond withbase block protection “BBL” with can prevent further operation for1 to 3 seconds depending on the drive size. Therefore the timesshould be adjusted to prevent this. Additionally during this timethe speed control is turned off to prevent the motor from drivingagainst the brake.The total time between the drop of the direction signals(X2A.14 & X2A.15) and the turn off of motor current is LF.78+ LF.79. The time delay for dropping the enable (X2A.16) andthe opening of the motor contact should be greater than thesum of LF.78 and LF.79.Unit: secondsValue range: 0.1 … 0.5 SecondsDefault setting: 0.3 Secondsii
