Turntable control SmartTurn
Structure and function
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4.2.5 Overrun monitor
If the 0-position is overrun during a rotation the warning "Overrun
forward" or "Overrun backward" is output.
The warning is signaled to the PLC.
In reverse mode the fault is deleted by activation of "Reverse on"
"Forward on" and leaving the overrun.
In continuous mode the fault is deleted with a subsequent
"Forward on" activation. In continuous mode there is no "Overrun
back" warning.
In special mode the fault is deleted through the "Forward on" or
"Backward on" activation.
NOTE!
Additional fault correction instructions are provided
in the section -> Sequence fault – Overrun
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4.2.6 System monitoring
All important system components are monitored.
If an uncertain state that compromises safe operation of the
turntable is detected, then the "System fault" output is set and the
two outputs A1 and A2 are switched off immediately. Each
activation is ignored by the PLC, the turntable movements are
blocked.
System faults can be:
Missing sensor data (sensor, sensor cable, or position encoder
is defective).
Invalid sensor data (deviation of the position data after
switching on 24 V).
Impermissible mode change.
Short circuit on the outputs.
End of lock angle reserve is reached.
Internal device fault.
Additional instructions on fault rectification are provided in the
section -> System fault.
NOTE!
Additional instructions on fault rectification are
provided in the section -> System fault.
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