Control Techniques Digitax ST

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Menu 12

Digitax ST Advanced User Guide 165

Issue Number: 1 www.controltechniques.com

The post-brake release time is used to allow for the brake release time. From the time that the drive is enabled and then during this period the speed

reference is held constant at zero, so that there is no sudden increase in motor speed when the brake actually releases.

The brake apply delay is used to allow for the brake application time. During this period the Hold zero speed parameter (Pr 6.08) is one, and so the

drive is enabled with zero speed reference. This ensures that the motor remains stationary while the brake is being applied.

If this parameter is zero then ramp hold only is applied when the drive is not active and until the end of the post-brake release delay to ensure that the

speed reference remains at zero until the brake has released. If this parameter is set to one the position controller (see menu 13) is also enabled

(Pr 13.10 = 1) and the local position reference source is selected (Pr 13.04 = 4(LocAL)) during the period when ramp hold is active. Provided the

default, non-absolute mode, is selected the position controller can help to limit the movement of the motor when the brake is released. When Pr 12.49

is changed from one to zero Pr 13.04 and Pr 13.10 are automatically set to zero.

12.47

Post-brake release delay