
B–63122EN/01
29. SAFETY FUNCTIONS
NC FUNCTION
201
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. This function is also useful
when overtravel of the machine from the stroke end in, for example, ATC
reference points, must be kept to a minimum.
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.
29.4
EXTERNAL
DECELERATION
29.5
ABNORMAL LOAD
DETECTION