HEIDENHAIN CNC Pilot 4290 - Manual (Page 66)

3 Manual Control and Automatic mode 54
3.7 Load Monit
or
ing
3.7.1 Reference Machining
The reference machining cycle (registration of nominal
values) determines the reference values for the
maximal permissible torque and work of each
monitoring zone.
CNC PILOT executes a reference machining cycle if:
■ The parameters for monitoring have not been
entered.
■ You press ”Yes” in the ”Reference machining”
dialog box (after having selected the program).
Selection: ”Display – Load monitoring – Load
monitoring display” (Automatic mode).
”Taking nominal values” submenu
■ ”Curves” menu item
Assign the input fields ”curves 1...4” to the drives.
The value in ”Display grid” influences the accuracy
and velocity of the graphical display. A small value
increases the accuracy of the display (values: 4, 9,
19, 39 seconds per image).
■ ”Mode” menu group
■ Line graphics: Display torque values over the
time axis
Continued
3.7 Load Monitoring
The load monitoring function of the CNC PILOT
compares the current torque, or the values for work,
with the values from a ”reference run.”
If ”torque limit 1” or the ”work limit” is exceeded, the
CNC PILOT marks the tool as ”worn out.” If ”torque
limit 2” is exceeded, the CNC PILOT assumes tool
breakage and stops machining (feed stop). Violations
of limit values are reported as error messages.
The load monitoring identifies worn tool in the ”tool
diagnosis bits.” If you are using the tool life
management function, the CNC PILOT will manage
the replacement of tools (see ”
4.2.4 Tool
Programming”). You can also evaluate the ”tool
diagnosis bits” in the NC program.
The load monitoring function defines the monitoring
zones and the drives to be monitored (G995) in the
NC program. The torque limits of a monitoring zone
depend on the maximum torque determined by the
reference machining cycle.
The CNC PILOT checks the values for torque and work in each
interpolator cycle and displays the values in a time reference grid of
20 ms. The limit values are calculated from the reference values and
the limit factor (control parameter 8). You can later change the limit
values in ”Edit load parameters.”
■ Make sure that the conditions for reference machining
comply with those for production (feed-rate/speed override,
tool quality, etc.).
■ Up to four components are monitored per monitoring
zone.
■ Using ”G996 Type of load monitoring,” you can control
the hiding the rapid traverses paths and the monitoring of
torque and/or work.
■ The graphic and numeric displays are relative to the rated
torque values.