Esd Functions - Samson 3730 Series Mounting And Operating Instructions

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ESD functions

TROVIS-VIEW 3: [Diagnosis > ESD]
In TROVIS-VIEW 3, the functions of the
positioner in ESD version are listed in the
[Diagnosis] folder under Emergency Shut
Down. They include:
4
Activating/deactivating ESD mode and
starting the partial stroke test
4
Setting the parameters for partial stroke
testing
4
Defining the cancellation conditions for
partial stroke testing
Note!
Instructions on how to change parameters
and start the partial stroke test can be found
in section 2.1 "Changing ESD parameters
and starting the partial stroke test".
ESD mode
ESD mode is active if the Desired ESD mode
parameter is set to "On".
In ESD mode, the safety shut-off valve is
specifically moved to the set point of the
valve working range (parameter: Required
manual reference variable w ).
The positioner behaves similar to a solenoid
valve, which keeps the attached valve open.
The current valve position is indicated under
Manual reference variable w .
The ESD operating mode parameter sets the
conditions for starting the partial stroke test:
Test started manually (ESD Man)
ESD operating mode parameter = ESD Man
Partial stroke testing begins when triggered
by the Start step response parameter. Other-
wise, the valve remains in the position de-
fined by the Required manual reference
variable w parameter.
Changes to the parameters can only be
made in ESD Man mode.
Test started automatically according to
schedule (ESD Auto)
ESD operating mode parameter = "ESD
Auto"
Partial stroke tests are conducted at regular
intervals. The Time until the next automatic
ESD test parameter indicates when the next
test is scheduled (countdown).
ESD functions
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EB 8388-1 EN