The action of changing speed from any speed to a lower speed, irrespective of direction. Depending on drive design, the control of deceleration time may be known as "Down time", "Down rate" or similar variant. It is important to remember that some drive designs apply a single rate control to negative going speed demand changes irrespective of polarity. For example, consider a drive running forwards at half speed being asked to run backwards at half speed. The speed demand can be considered to be negative going, but the period between the drive running at half speed forwards and zero speed is termed deceleration and the period between zero speed and running at half speed backwards is termed acceleration. See also Angular deceleration, Linear deceleration.
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