To stop the press when the user requests an emergency stop, we use the safe stop 1 (SS1) function, which brakes the motor before turning off the power (STO function), to prevent the press from continuing its freewheeling travel.
When the press receives a stop request on the DI16 input, the motor is braked autonomously following a fast stop ramp and when the motor is stopped, the power supplied to the motor is switched off. It is then necessary to switch off the pulses using the DI17 input and switch off the contactor that supplies the motor for a safe stop of the motor.
The emergency press stop cycle is explained below. (figure 1)
Figure 1: Chronogram of the press emergency stop cycle