Axis Monitoring (A3)
2.3 Encoder monitoring functions
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
49
Effect
When the limit frequency of an encoder is exceeded the following occurs:
● The "Encoder limit frequency exceeded 1" interface signal (V390x 0000.2) is set.
● Spindle continues to run with closed-loop speed control.
If the spindle speed is reduced to a value that causes the encoder frequency to drop
below the setting in MD 36302 ENC_FREQ_LIMIT_LOW (% value of MD36300), the
spindle is automatically re-synchronized with the reference system of the encoder.
● If the limit frequency is exceeded while the measuring system of a position controlled
axis/spindle is active, alarm 21610 "Frequency is exceeded" is signaled.
● 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 is assigned to an interpolatory grouping with other axes, then these are also
braked by rapid stop with following error reduction (default for partial position setpoint =
0).
Remedy
After the axes have stopped, the position control is automatically resumed.
Note
The axis affected must be re-referenced.
2.3.2 Zero mark monitoring
Function
The zero mark monitoring checks whether pulses were lost between two zero mark passes
of the position actual value encoder. Enter the number of identified zero mark errors at which
the monitoring function should respond in MD36310 ENC_ZERO_MONITORING (zero mark
monitoring).
Effectiveness
The monitoring function is activated with MD36310 ENC_ZERO_MONITORING.
The zero mark error count starts with "0" each time the encoder is switched on.
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