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5.11 Pushback monitoring
Pushback PB
The monitoring function checks the movement of the drive as a function of the specified effective dir-
ection of the torque. The torque setpoint value may at most trigger an aligned movement. A reverse
movement is only permissible below the parameterised velocity threshold value. If the torque setpoint
value = 0, movements in both directions are only permitted below the parameterised threshold value.
Timing
Status signal PB
Initial state = 0
The signal is set under the following conditions:
Torque setpoint
≄
0:
– The actual speed value exceeds the threshold value for longer than the damp-
ing time
– AND the drive moves in the opposite direction to the torque.
Torque setpoint = 0:
– The actual speed value exceeds the threshold value for longer than the damp-
ing time.
0
à
1
The signal is reset under the following conditions:
–
The setting logic is inverted.
1
à
0
Tab. 327 Status signals - Pushback monitoring
Parameters and diagnostic messages
ID Px. Parameters Description
Specifies the monitoring window for pushback monitoring.
Threshold value for monitoring the actual speed (direction of
movement) in relation to the effective direction of the torque
(setpoint value).
Access read/write
Update effective immediately
4663 Monitoring window
pushback
Unit user defined
Specifies the damping time for pushback monitoring. Minimum
duration that the threshold value can be exceeded before a mes-
sage is generated. The damping time is restarted if the actual
velocity is below the threshold value or if the prefix for the spe-
cified setpoint value (torque) changes during the evaluation of
the damping time. 4664 Damping time push-
back
Access read/write
Motion monitoring
335 Festo — CMMT-ST-SW — 2019-02