EB 8359-2 EN 29
Operating the positioner
Operating direction increasing/increasing
(direct <<)
feeler pin on top of apper plate
Operating direction increasing/decreasing
(reverse <>)
apper plate on top of feeler pin
Range spring
Feeler pin
Cover plate
Nozzle block
Marking Flapper plate
Fig.10: Position of nozzle block, cover plate removed
0%
4 20mA
Reference variable
Input signal
Open
Travel
Closed
0%
412 20mA
Dead band
Valve 2 Valve 1
Open
Travel
Closed
Fig.11: Normal operation Fig.12: Split-range operation, two valves operating in
opposing directions
To Next Page
Loading...
