
B-63494EN/02 3.SAFETY FUNCTIONS
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3.5 EMERGENCY STOP
The emergency stop signal is monitored in redundant mode. When the
emergency stop is input, the servo motor slows down to a stop (*) and
enters the dynamic brake stop. The spindle slows down to a stop(*) as
instructed by the PMC, and the power is shut off.
CAUTION
To enable the function to slow down and stop the
servo motor, the corresponding parameter must be
specified. If the parameter is not specified, the
motor immediately enters the dynamic brake stop
state.
The spindle motor slows down and stops as
instructed by the PMC (Ladder program). If the
PMC does not instruct this, the motor maintains the
high speed prior to the power-down and coasts. If
an illegal speed is specified because of a failure on
the PMC side while the safety function is active (the
protective door is open), the CNC enters the safe
stop state.
WARNING
In the emergency stop state, the guard unlock
signal becomes 1 (the door opens). In the
emergency stop state, the processing to open or
close the protective door depends on the Ladder
program created by the machine tool builder. For
instance, if the protective door should not be
opened in the emergency stop state, a Ladder
program of the processing must be created.
When the emergency stop is canceled, an alarm may occur, depending
on the state. For instance, if the emergency stop state is canceled with
the protective door open and if no door open request is made, the CNC
judges that an error has occurred and enters the safe stop state.
IMPORTANT
(*) Emergency Stop Button must fulfill the Standard
IEC60947-5-1.
This is mandatory.