HEIDENHAIN TNC 335 Technical Manual - Manual (Page 167)

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TNC 360 3 Servo Positioning of the NC Axes 8/95
3.5.2 Position monitoring for operation with feed forward control
In operation with feed forward control the ranges for continuous position monitoring are determined
by MP1410 and MP1420 lag monitoring. The monitoring is active as soon as the axes are under the
control of the position control loop.
If the limits of MP1410 are exceeded, the error message
"Positioning error"
will appear, which can be canceled with the "CE" key. If the limit of parameter MP1420 is exceeded,
the flashing error message
"Gross positioning error A"
appears. This error can only be canceled by switching off the control.
If clamped axes cause the error message "Positioning error", a residual voltage can remain at the
nominal value output, since the machine axes can no longer be traversed. MP1150 can be used to
program a time after which the residual voltage becomes zero. After this period a nominal/actual
value transfer is carried out. If the error message is canceled by "CE" before the time has elapsed,
the nominal/actual value transfer is carried out and the residual voltage is switched off. This machine
parameter functions in operation with lag as well as with feed forward control.
MP1410 Position monitoring in operation with feed forward control (cancelable)
Input value: 0.001 to 30 [mm]
MP1420 Position monitoring in operation with feed forward control (EMERGENCY
STOP)
Input value: 0.001 to 30 [mm]
MP1150 Delay time before switching off the residual voltage on error message
"Positioning error"
Input value: 0 to 65.535 [s]