Structure and function
20 Dok-ID:EXPERT-0003-EN-2011
Pos: 4. 8 /Smart Tur n/4.2.1 aa Opti mieru ng 0- Stel lung @ 1\mod_1219134976670_38.doc @ 6980
4.2.3 0-position optimization
With "Forward on" or "Backward on" the turntable controller checks
the activated direction and the momentary position. If the result is
OK, the output "Forward start" or "Backward start" is enabled.
The turntable will then start to rotate.
When the switch-off angle is reached, the output "Forward start" or
"Backward start" is switched off and the turntable is stopped
immediately.
With each rotation the turntable controller calculates the switch-off
angle for the next rotation so that the turntable comes to a stop in
the optimal 0-position.
When first switched on, a default value is used that is specific to
the lock movement. Thereafter deviation from the optimal 0-
position is determined and the switch-off angle is determined for
the next rotation.
The 0-position is present when the position deviation does not
exceed +/- 8 degrees based on the optimal 0-position.
If the turntable is in this position, the "0-position" signal is output to
the PLC.
Calculation and optimization occur separately for forward and
backward. Thus time-intensive settings at start-up are not
necessary.
The turntable controller is self-adjusting and self-optimizing.
If, when switching on the operating voltage, a deviation to the last
saved position is detected, then this results in a system fault.
All d ata i s s ave d fai l s afe.
NOTE!
See section -> System fault - note invalid sensor
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