Diagnostics; Partial Stroke Test Diagnostics - Baker Hughes Masoneilan SVI II ESD Quick Start Manual

Sil3 emergency shutdown device & pst controller

Table of Contents

Diagnostics

The SVI II ESD provides two types of diagnostic information; the continuous diagnostics that re-

quire no user configuration for which no valve movement occurs and Partial Stroke Testing (PST)

diagnostics that you can configure and run at any time. You can also manually run a proof test

(see page 19).

The SVI II ESD is capable of partially stroking the valve to detect failures in the final control ele-

ment assembly. The PST is configured using the pushbutton display or through ValVue ESD. Upon

detection of a failure or deviation from the user configurable conditions the annunciation chan-

nel SW 1 sets its state to low.

The PST can be configured to start automatically or can be initiated through setting the current

input to 16.4 mA. +/- 0.1mA, local control panel pushbutton, or initiated locally by an operator.

When configured to run automatically or when initiated through a safety rated logic solver, ad-

ditional diagnostic credit can be taken for the PST.

In addition to the safety rated I/O, HART

formation on the SVI II ESD status. Additional diagnostic functions include:

With ASD or A/DSD modes, the device is capable of capturing and storing the

shutdown event when the safety function is engaged and / or when the

valve is positioned using the control signal (4-20 mA or 0-24 VDC).

The SVI II ESD can provide general information of the device's sensor health

(Temperature, Actuator Pressure, Air supply, Current, etc.).

Capable of annunciating faults resulting from a PST.

Discrete output (SW1) is de-energized for any fault related to the I/P, relay, or

valve/actuation assembly, resulting from a PST or during normal operation.

For most fault conditions, the ESD device attempts to remain in the

energized state until an ESD command is given (unless specified otherwise

during setup).

communications are available to provide additional in-

Masoneilan SVI II ESD Quick Start Guide =| 69

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Masoneilan svi ii esd sil3