Operation Manual

HEIDENHAIN CNC PILOT 640 119
3.10 Load monitoring (option)
3.10 Load monitoring (option)
During a machining operation with active load monitoring, the control
compares the current utilization of the drives specified by G995 with
the respective limit values. To calculate the limit values for a
monitoring zone defined with G995, the control uses reference values
determined during reference machining as well as predefined factors
specified in the machine parameters.
If the utilization limit 1 or the total utilization limit is exceeded, the
control issues a warning and sets the corresponding diagnostic bits in
the tool editor to identify the active tool as worn-out.
If the utilization limit 2 is exceeded, the control issues an error
message, stops the machining operation and sets the corresponding
diagnostic bits in the tool editor to identify the active tool as broken.
The control must be specially prepared by the machine
tool builder for the use of the Load Monitoring option.
The following steps are required before you can use the
load monitoring feature in the Program Run submode:
 Define the respective machine parameters in the
System section (siehe „List of user parameters”, Seite
545)
 In the smart.Turn operating mode, define the type of load
monitoring with G996 and the monitoring zone with G995
in your program (see smart.Turn and DIN Programming
User's Manual)
When tool life monitoring is active, the control will
automatically insert a predefined sister tool during the next
tool call in order to replace the tool that has been identified
as worn-out or broken by the diagnostic bits of the tool
editor. As an alternative to the automatic evaluation of the
diagnostic bits by the tool life monitoring function, you can
also evaluate the diagnostic bits in your program.
Keep in mind that load monitoring is not possible for
hanging axes without counterweight!
Note that load monitoring only works to a limited extent if
the load changes are small. Therefore, monitor the drives
that are subjected to significant loads, such as the main
spindle.