Answer / raj anu raj

the valve will go to its fail safe position ie.. either
open or close

Answer / varathan

when communication failure occurs, Valve positioner have
three different action depend on application.
1. Fail to close
2. Fail to open
3. Fail to Standstill.(remain in the previous position)
Note: In automatic closed loop system, during failure
condition; controller must be forced back to manual mode
for safe operation

Answer / vijay singh

if profibus fails in operation.Valve positioner have
different action depend on application.
1.if valve is fail to open then valve will be in fully open
position
2.if valve is fail to close then valve will be in fully
close position.

Answer / ecxlsync

in an event of profibus failure or an absence of command signal, some valves will remain its current position, some will return to its safe position (fail safe).
There are valves designed to fully close (Fail to Close) or Fully Open (Fail to Open) in an event of failure.

Answer / jignesh parekh

during fail of profibus a valve be remain as it is. because
there is no command to travel a control valve move close or
open.

How to measure the vibration..?

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loop chech tools list

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2 Answers