15
4.4
Technical Data Safety
Reaction time of the security inputs (until
activation of a safety function)
< 2ms
Probability of a dangerous failure per hour (PFH)
PFH = 51.7 * 10
-9
1/h
Activation of a safety function Switching on two channel to 0V
One-channel switched safety inputs lead to turn off of
the power stage and requires a restart of the XENAX®
servo controller.
Level of safety inputs >21.0V safety input inactive
< 2.0V safety input active
Voltage levels outside of these limits are prohibited.
Hierarchy of safety functions
Hierarchy
Safety Functions
4
STO
Safe Torque Off
3
SS1
Safe Stop 1
2
SS2
Safe Stop 2
1
SLS
Safely Limited Speed
Safety functions of higher hierarchy levels overdrive
the ones below.
