Axis Monitoring (A3)
2.2 Motion monitoring functions
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
45
Effect
When the monitoring function responds, it has the following effects:
● Alarm 25040 "Standstill monitoring" is triggered
● The affected axis/spindle is brought to a standstill with rapid stop (with open position
control loop) along a speed setpoint ramp. The braking ramp time is set in
MD36610 AX_EMERGENCY_STOP_TIME (duration of the braking ramp for error states).
● If the axis/spindle is involved in interpolation with other axes/spindles, these are stopped
by rapid stop with following error reduction (default for position partial setpoint = 0).
Cause of error / remedy
● Position control gain too high (control loop oscillation) --> change machine data for
control gain MD32200 POSCTRL_GAIN (servo gain factor)
● Standstill window too small --> change machine data
MD36030 STANDSTILL_POS_TOL (standstill tolerance)
● Axis is mechanically "pushed" out of position --> eliminate cause
2.2.4 Clamping monitoring
Function
If the axis must be clamped once it has been positioned, the clamping monitoring function
can be activated via IS "Clamping in progress" (V380x 0002.3).
This may be necessary as the axis can be forced further from the setpoint than the standstill
tolerance permits during the clamping process. The amount by which the axis may leave the
command position is specified in MD36050 CLAMP_POS_TOL (clamping tolerance for
interface signal "Clamping active").
Effectiveness
Clamping monitoring is activated by the interface signal "Clamping active". It replaces
standstill monitoring during clamping.
Clamping monitoring is active on axes and position-controlled spindles.
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