B–63682EN/01
29. SAFETY FUNCTIONS
NC FUNCTION
229
Feed rate can be decelerated by an external deceleration signal from the
machine side. A feed rate after deceleration can be set by parameter.
External deceleration is prepared every axis and every direction.
When the tool is to be moved in the reverse direction, futile time may not
be wasted since no external deceleration is applied.
By setting the corresponding parameter, whether to make this signal
effective only for rapid traverse mode or for all feed modes can be
specified for each axis and for each direction.
This function allows the maximum of valid strokes and keeps shock to the
machine to a minimum, to stops at stroke end.
When a cutting tool collides with the machine body or is damaged during
cutting, the load torque applied to the servo motors is larger than during
normal feeding or cutting. The abnormal load detection function
calculates the load torque and transfers the value from the CNC to the
PMC. If the load torque is larger than the value set in a parameter, the
function stop the motor or reverses the motor rotation to retract the tool
by the distance set in a parameter. In this way, damage to the machine is
prevented.
The CNC stores disturbance load torque data detected by servo control
software or spindle control software in internal memory.
1 Referencing stored torque data with the PMC via a window
2 Calculating the average, maximum and distribution of stored torque
data (statistical calculation) and reading these values through a
window
3 Plotting a graph of stored torque data on the torque monitor screen
4 Setting the detection level of the abnormal load detection alarm on the
torque monitor screen. (The abnormal load detection function is a
separate option.)
5 Saving stored torque data as sample data so that it can be compared
with later data
6 Saving stored torque data in a memory card
CAUTION
This function is a monitor function providing detailed
disturbance load torque data. This function allows
monitoring of more detailed information about the
disturbance load for each axis. When this monitor function
is used to develop and supply a protection function for a
machine or tool, a thorough confirmation must be made
using the actual machine to ensure that an appropriate
operation can be obtained before the function is supplied.
29.4
EXTERNAL
DECELERATION
29.5
ABNORMAL LOAD
DETECTION
29.6
FINE TORQUE
SENSING