Table of Contents
Advertisement
Function description
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
–
}
Outputs O0 ... O3
–
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
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.
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
SSR Activate
SRA Safe Range Acknowledge
INFORMATION
See the Configurator's online help for details of how to set the parameters
for the tolerance range.
33
Advertisement
Table of Contents
