Function description
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
33
4.3.6
Safe speed range - SSR
The safety function "safe speed range" (SSR) monitors the drive's current speed to ensure
it stays within a maximum and minimum permitted limit value.
Input and output assignment in the Configurator:
}
Inputs I0 ... I6
–
SSR Activate
}
Outputs O0 … O3
–
SRA Safe Range Acknowledge
Prerequisites for normal operation:
}
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
}
Input "SSR Activate": "1" Signal (+24 VDC)
Safety function is activated
}
By a 1/0 pulse edge at the input "SSR Activate".
Reaction:
}
SSR delay time starts
}
Once the SSR delay time has elapsed, the speed is monitored.
}
Output "SRA Safe Range Acknowledge": "1" signal
}
If the limit value is exceeded, safety function SS1 is activated.
A tolerance range may also be set for the limit values used to monitor the speed. This toler-
ance range modifies the set limit values. As a result, one-off or periodic overshoots that ex-
ceed the limit values can be tolerated.
The following values can be set for the tolerance range:
}
Tolerance amount, which takes into account the size of the overshoots.
}
Tolerance time, which takes into account the length of the overshoots
}
Tolerence period that takes into account the variation period
INFORMATION
See the Configurator's online help for details of how to set the parameters
for the tolerance range.
Activate the tolerance range:
}
The tolerance range becomes active the first time the speed limit value is exceeded
(see flowchart).
Reaction:
}
If the tolerance range is exceeded, the safety function SS1 (E-STOP braking ramp) is
activated.
The following diagrams illustrate the sequences, with and without the tolerance range activ-
ated.
