Woodward Large Electric Sonic Valve II, Installation And Operation Manual, Page: 53 / 66

Manual 35076 LESV II
Woodward 51
Response Time Data
Under normal operating conditions with maximum gas pressure applied to the LESV II, the full stroke
response time is 1-second maximum from 100% position to fully closed. When the LESV II is offline with
no gas pressure, the full stroke response time is 750 milliseconds maximum from 100% position to fully
closed.
Limitations
When proper installation, maintenance, proof testing, and environmental limitations are observed, the
useful life of the LESV II is 48,000 hours of operation. The LESV II can be refurbished and a product life
of 20 years can be achieved.
Management of Functional Safety
The LESV is intended for use according to the requirements of a safety lifecycle management process
such as IEC61508 or IEC61511. The safety performance numbers in this chapter can be used for the
evaluation of the overall safety lifecycle.
Restrictions
The user must complete a full functional check of the LESV after initial installation, and after any
modification of the overall safety system. No modification shall be made to the LESV unless directed by
Woodward. This functional check should include as much of the safety system as possible, such as
sensors, transmitters, actuators, and trip blocks. The results of any functional check shall be recorded for
future review.
The LESV must be used within the published specification in this manual.
Competence of Personnel
All personnel involved in the installation and maintenance of the LESV must have appropriate training.
Training and guidance materials are included in this manual.
These personnel shall report to Woodward any failures detected during operation that may impact
functional safety.
Operation and Maintenance Practice
A periodic proof (functional) test of the LESV is required to verify that any dangerous faults not detected
by safety controller internal run-time diagnostics are detected. More information is in the “Proof Test”
section below. The frequency of the proof test is determined by the overall safety system design, of which
the LESV is part of the safety system. The safety numbers are given in the following sections to help the
system integrator determine the appropriate test interval.
The LESV requires no special tools for operation or maintenance of the LESV.
Installation and Site Acceptance Testing
Installation and use of the LESV must conform to the guidelines and restrictions included in this manual.
No other information is needed for installation, programming, and maintenance.
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