HEIDENHAIN TNC 335 Technical Manual - Manual (Page 168)

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TNC 360 3 Servo Positioning of the NC Axes 4-71
3.5.3 Monitoring the analog voltage
Monitoring of the analog voltage is only possible in operation with feed forward control.
If it exceeds 10 V, the flashing error message
"Gross positioning error B"
is displayed.
3.5.4 Movement monitoring
The movement monitoring functions in operation with feed forward control as well as with lag.
During movement monitoring, the actual path traveled is compared with a nominal path calculated
by the NC at short intervals (several servo cycles). If, during this period, the actual path traveled
differs from the calculated path, the flashing error message
"Gross positioning error C"
is displayed.
In machine parameter MP1140 a voltage can be stored, below which the movement monitoring is
out of action.
If 10 [V] is entered in this machine parameter, the movement monitoring becomes
inactive. It is not possible to operate the machine safely without movement
monitoring.
MP1140 Movement monitoring
Input value: 0.03 to 10 [V]