Cam control basics
3.3 Hysteresis
FM 352 electronic cam controller
22 Operating Instructions, 05/2011, A5E01071724-03
3.3 Hysteresis
Definition
Mechanical imbalance at the axis may cause fluctuation of the actual position value. If the
actual position value is offset by one edge of a cam, or within an active cam with only one
effective direction, this cam's activation would be cycled on and off continuously. A
hysteresis prevents this flutter.
A hysteresis setting is dependent on the actual value, and applies globally to all cams. It is
enabled when a direction reversal is detected. A hysteresis will always take effect,
regardless of whether or not a cam is set at the current axis position.
Rules for the hysteresis range
Rules applicable to the hysteresis range:
● The hysteresis will always be set when a directional reversal is detected.
● The indication of the actual value remains constant within the hysteresis.
● The direction is not redefined within the hysteresis.
● A position-based cam is neither activated nor deactivated within the hysteresis.
● A time-based cam is not activated within the hysteresis. An active time-based cam is
deactivated on expiration of the assigned activation (not only on reaching the hysteresis
limit).
● When the value is out of the hysteresis range, the FM 352 sets:
– the actual position value
– the current direction of motion of the axis
– the current states of all cams
● The hysteresis range applies to all cams.
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