Festo Контроллер крайних положений SPC11 - Manual (Page 19)

1. Summary of components
1-5
Festo P.BE-SPC11-SYS-EN en 1406e
During operation, the SPC11 controls movement of the move-
able mass into the saved end positions and intermediate
positions at the highest possible speed. Shortly before the
“learnt” end position or intermediate position is reached, the
moveable mass is braked so that it comes to a standstill.
To keep the moveable mass in the “learnt” end position, it is
pressed against the fixed stop (typically at a pressure that is
slightly less than the operating pressure).
Advantages
Compared to impact-limited drives with pulse-valve control,
this control procedure permits higher positioning speeds.
Also, the following measures, which would be required for
controlling a drive with a pulse valve, are no longer necess-
ary:
– the use of restrictors
– the use of limit switches
– the use of mechanical end position cushioning
(shock absorbers)
– the maintenance of fixed stops.
Compared with impact-limited drives with pulse-valve control,
the SPC11 permits:
– higher machine cycle times
– less vibration of the system
– lower maintenance costs.