Axis Monitoring (A3)
2.2 Motion monitoring functions
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
47
Effect
The following occurs if the maximum speed setpoint value is exceeded:
● Alarm 25060 "Speed setpoint limiting" is triggered
● The affected axis/spindle is brought to a standstill using a rapid stop (with open position
control loop) along a speed setpoint ramp.
The braking ramp duration is set in MD36610 AX_EMERGENCY_STOP_TIME (braking
ramp duration for error states).
● If the axis/spindle is involved in interpolation with other axes/spindles, these are stopped
using a rapid stop with following error reduction (default for partial position setpoint = 0).
Note
In the "Expert mode" access level (protection level 1), MD36220 CTRLOUT_LIMIT_TIME
can be used to set a delay time, after the expiration of which an alarm is output and the
axes are brought to a standstill. The default value of this time is zero.
Using speed setpoint limiting will turn the control loop into a non-linear control loop. This
generally causes contour deviations if speed setpoint limiting is continued for an axis. A
control margin must therefore be set (see the section titled "Speed setpoint output").
Causes of errors
● A measuring circuit error or drive error is present.
● Setpoints are too high (accelerations, velocities, reducing factors).
● Obstacle in work area (e.g. positioning on a working table)
● Tachogenerator compensation has not been performed correctly for an analog spindle, or
a measuring circuit error or drive error is present.
2.2.6 Actual velocity monitoring
Function
This function monitors whether the actual velocity exceeds a permissible limit entered in
MD36200 AX_VELO_LIMIT (threshold value for velocity monitoring).
Effectiveness
The actual velocity monitor is operative whenever the active measuring circuit activated via
"Position measuring system 1" interface signal (V380x 0001.5) is supplying actual values,
i.e. still operating below the limit frequency.
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