Function description
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
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}
Reset: Input for reset
}
Ready: Output for operating status of the safety card
}
STO Acknowledge: Output for feedback from safety function STO
4.3.3
Safe stop 2 - SS2
The safety function "Safe Stop 2" (SS2) brakes the drive in a controlled manner and monit-
ors it for standstill.
Features of the safety function:
}
The drive’s control functions are maintained. Power is applied to the motor.
}
Power to the motor is not shut down.
}
The safety function "Safe Stop 2" corresponds to controlled braking in accordance with
IEC 60204-1, stop category 2.
The safety card monitors the following functions:
}
Braking ramp
In the Configurator, the braking ramp is specified and monitoring is activated. The brak-
ing period depends on the speed of the motor when braking is started.
The braking ramp can be monitored via a maximum position error specified in the Con-
figurator.
}
Braking ramp in normal operation
The drive starts with the configured braking ramp when safety function SS2 has been
activated. Once the time has elapsed, SOS is activated.
}
Standstill position
–
The safety function monitors whether the standstill position remains within a con-
figured tolerance window.
–
Safety function SS1 (E-STOP braking ramp) is activated if the standstill position
leaves the tolerance window.
}
Automatic SOS at standstill
A standstill threshold for activating the safety function SOS can be specified in the Con-
figurator.
Safety function SOS is activated when
–
standstill is achieved while the SOS delay time is running.
–
the SOS delay time has elapsed.
Input and output assignment in the Configurator:
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Inputs I0 ... I6
–
SS2 Activate
}
Outputs O0 … O3
–
SSA Safe Standstill Acknowledge
Prerequisites for normal operation:
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Input "SS1 Activate" and "Reset": "1" Signal (+24 VDC)
}
"Ready" output: "1" Signal (+24 VDC). The safety card is ready for operation.
}
"STO Acknowledge" output: “0” Signal
