Function description
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
27
Timing diagram:
Braking ramp
s, v
t
t1
Reset
1
0
1
0
SOS delay time
Tolerance window
Braking ramp
Limit value
Standstill detection
v (t)
s (t)
Tolerance window
Standstill position
1
0
1
0
1
0
SS1 Activate
Ready
STO Acknowledge
SSA Safe Standstill
Acknowledge
SOS
t2
1
0
SS2 Activate
Fig.: Safety function SS2
}
t
1
: Activation of safety function SS2
}
t
2
: Activation of safety function SOS
}
SS1 Activate: Input for safety function SS1
}
Reset: Input for reset
}
SS2 Activate: Input for safety function SS2
}
Ready: Output for operating status of safety card and second output for feedback from
safety function STO
}
STO Acknowledge: Output for feedback from safety function STO
}
SSA Safe Standstill Acknowledge: Output for feedback from limit value monitoring
4.3.4
Safe operating stop - SOS
The safety function "safe operating stop" (SOS) monitors the standstill position that has
been reached. An error will activate safety function SS1 (E-STOP braking ramp).
Features of the safety function:
}
The drive’s control functions are maintained in the standstill position.
}
Power to the motor is not shut down.
