Introduction
1.3 Application overview
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
13
STO and SS1 are suitable for the EMERGENCY STOP function when the following
preconditions are carefully taken into consideration:
The user must evaluate as to whether an immediate shutdown of the energy feed for STO
does not result in dangerous states (uncontrolled stopping - STOP category 0 according to
EN ISO 13850).
When using SS1, if the line supply fails, the drive can no longer be actively braked - and it
must be taken into consideration that the drive only comes to an absolute standstill at a later
point in time.
Although actuating the EMERGENCY STOP switch disconnects the energy feed to the drive,
for a permanently excited DC motor that is still rotating, a voltage is still present at the
armature terminals corresponding to the speed.
With an EMERGENCY OFF function the system is brought into a no voltage condition after
switching off in an emergency according to IEC 60204-1. The motor must then come to a
complete standstill and the field supply must have been switched off.
EMERGENCY STOP function according to EN ISO 13850:
The function of the EMERGENCY STOP equipment must be designed so that after actuating
the EMERGENCY STOP device, hazardous motion and operation of the machine are
stopped in a suitable fashion without resulting in any additional risks and dangers.
The following recommendations are described in this document:
Stop Category 0 (STO = Safe Torque OFF)
Stop Category 1 (SS1 = Safe Stop 1)
Overview of the various configurations
Switching device STO SS1 Achievable Performance
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