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SE-Power FS STO-manual vers. 1.6 en.12.08.2015
37
The safety function “Safe Stop 1” (SS1, type C) can be requested via various devices
can be, for example, an emergency stop switch, a safety
door switch or a light barrier. The safety request is made in 2-channels via switch S1 and to
the safety switching device. The safety switching device switches off the servo drive enable.
If the servo drive enable switched off, the movement is automatically delayed and, if the
brake is configured, brake activation is expected before the control circuit is switched off.
After a time set in the safety switching device, the 2-channel output stage is switched off via
STO-A/B. Once the output stage has been switched off, it is output by the floating contact
C1-C2.
Notes with regard to a typical circuit:
The safety switching device used must switch off the servo drive enable (X1-9, DIN5)
without a delay and the inputs STO-A and STO-B (X40-1, -3) with a delay.
The required delay is application-dependent and must be defined specific to the
application concerned. The delay must be designed so that the drive is decelerated to
zero, even at maximum speed, via the quick stop ramp in the SE-Power FS , before
STO-A/B are switched off.
The electrical installation is executed in accordance with the requirements of EN 60204-
1. For example, the safety switching device and the servo drive are located in the same
control cabinet, so that faults can be excluded for a cross-circuit or earth fault between
the cables (acceptance test on the control cabinet for faultless wiring).
The typical circuit exhibits a 2-channel structure, which is suitable for categories 3 and 4
with additional measures.
Which additional measures are required depends on the range of applications and the
safety concept of the machine.