HEIDENHAIN TNC 306 Technical Manual - Manual (Page 147)

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TNC 406/TNC 306 3 Servo positioning of the NC-axes 4-47
3.5.2 Monitoring the analog voltage difference
Monitoring of the maximum voltage difference between two control loop cycles.
As soon as the difference is greater than the value which is stored in MP1141, the flashing error
message
"Gross positioning error F"
is displayed.
MP1141 Maximum voltage difference between two control loop cycles
Entry value: 0.03 to 10 [v]
3.5.3 Movement monitoring
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.
Machine parameter MP1140 can store a voltage below which movement monitoring is inactive.
If 10 [V] is entered in this machine parameter, movement monitoring becomes
inactive. It is not possible to operate the machine safely without movement
monitoring.
MP1140 Movement monitoring
Entry value 0.03 to 10 [V]