W4: Grinding-specific tool offset and tool monitoring
17.4 Grinding-specific tool monitoring
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
827
When does monitoring take place?
The monitoring function for the grinding wheel radius remains active when an online tool
offset is selected:
● When the monitoring function is activated
● when the current radius (online tool offset, wear parameter) or the current width
($TC_TPG5) is altered
Monitor reactions
If the current grinding wheel radius becomes smaller than the value stored in parameter
$TC_TPG3 or the current grinding wheel width ($TC_TPG5) drops below the value defined
in $TC_TPG4, the axis/spindle-specific bit DBX83.3 is set to "1" in DB31, ... at the PLC
interface.
This bit is otherwise set to "0".
DB31, ... DBX83.3 = 1 ⇒ Geometry monitoring has responded
DB31, ... DBX83.3 = 0 ⇒ Geometry monitoring has not responded
Note
No error reaction is initiated internally in the control system.
17.4.3 Speed monitoring
Function
The speed monitor checks the grinding wheel peripheral speed (parameter $TC_TPG7) as
well as the maximum spindle speed (parameter $TC_TPG6).
The unit of measurement is:
● Grinding wheel peripheral speed m
*
s
-1
● Spindle speed rev/min
Monitoring is cyclic. The value is always limited to the first limit value reached.
When does monitoring take place?
The speed setpoint is monitored against the speed limitation cyclically, allowing for the
spindle override.
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