Samson 3730-3 ESD, Mounting And Operating Instructions

2

ESD functions

TROVIS-VIEW 3:

[Diagnosis > Emergency

Shut Down]

In TROVIS-VIEW 3, the functions of the
positioner in ESD mode 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

Target mode pa-

rameter in the [Positioner] folder under Op-
erating mode is set to “Emergency Shut
Down“ and

Desired ESD mode parameter in

the [Diagnosis] folder under Emergency Shut
Down 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 to a
set position, e.g. open. The valve does not
perform any control tasks anymore.

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.

8

EB 8388-1 EN

ESD functions