With safe stop 1 (SS1), the defined motor braking is part of the safety function. When the motor is at standstill, the STO function is triggered. There are various options for implementing these requirements; the key factor is the dovetailing of safety technology and drive technology. This safety function corresponds to a category 1 stop (controlled stop) in accordance with IEC 60204-1.
Monitoring of controlled braking
In many applications, drives cannot simply be shut down because they would then run down slowly, which could cause a hazard. Also, an uncontrolled run down of this type often takes considerably longer than controlled axis braking. The safe stop 1 function (SS1) monitors controlled braking of the axis directly within the servo amplifier. Once the set braking ramp has run its course, the drive is shut down safely. The reaction times are reduced compared with external monitoring solutions; as a result, in many cases the safety distances to the danger points can also be reduced. This provides a number of benefits, such as improved ergonomics for the plant operator, space savings due to the reduced distance between the guards and the danger points and, last but not least, cost savings.
More information on safe motion monitoring can be found on our application page:
