I&M V_9959_AA
ASCO Redundant Control System
2oo3D Enclosure with Proximity Sensor Diagnostics
Operation & Maintenance Guide
ASCO Valves® E301722 - 10/2020 All Rights Reserved. I&M V_9959_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com Page 1 of 7
Operation & Maintenance Guide
Redundant Control System
Table of Contents
PRODUCT DESCRIPTION ................................3
GENERAL SPECIFICATIONS ..............................4
INSTALLATION ..........................................4
Section 1. - Normally Closed ..............................6
1. General Operation ...................................................6
2. Testing and Maintenance: .............................................6
Section 2 ............................................... 7
1. Functional Test Certication ...........................................7
2. Spare Parts .........................................................7
3. Packaging ..........................................................7
4. Disclaimer .........................................................7
Page 2 of 7 I&M_V_9959_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com
Documentation Conventions
This guide uses the following typographic conventions:
EXAMPLE
NOTE
Notes containing supplementary information.
This symbol precedes information about potential
equipment damage.
This symbol precedes information about potential
personnel hazards.
Description
User Experience Prerequisites
To eectively use the Pneumatic RCS, users should have some
experience with pneumatic systems.
Warnings!
READ THIS ENTIRE MANUAL AND ALL RELATED
PUBLICATIONS PERTAINING TO THE WORK TO BE
PERFORMED BEFORE INSTALLING, OPERATING OR
SERVICING THIS EQUIPMENT.
• Follow all appropriate safety codes and standards.
• Failure to follow instructions may result in personal injury
and/or property damage.
• Use extreme caution when working around power-input
cables. These cables may have potentially lethal or
dangerous voltages.
• Prior to energizing the equipment, have qualified personnel
verify all wiring and connections against vendor drawings.
PRODUCT DESCRIPTION
The RCS is a two-out-of-three (2oo3) voting, solenoid-operated
valve system designed for use as a component in safety instrumented
systems. It functions as a redundant pneumatic tripping device to
control the pilot air signal to a process valve actuator. The RCS
uses 2oo3 voting solenoids to enhance the reliability of the circuit.
The RCS consists of three electrically actuated solenoid valves
(SOV1, SOV2, SOV3) and a pneumatically operated (Manually
Controlled) bypass valve, and four proximity sensors. The
proximity sensors provide solenoid state feedback and are used
during on-line testing of the RCS unit. The bypass valve allows for
maintenance of the solenoid valves without having to shut down
the process valve. The use of the Maintenance Bypass Valve is not
required for functional testing of the RCS unit. The 2oo3 RCS is
available as a normally-closed construction.
Under normal operating conditions:
The RCS allows for periodic testing of the solenoids by cycling
one solenoid valve and then the other either manually or
automatically therefore attaining the desired safety availability.
This testing is performed online without the need for bypassing
of the safety action and without interruption of the process.
For all constructions, four proximity sensors are included to
provide indication of each solenoid-operated valve and bypass
valve position.
Incorrect wiring and/or connections can result in equipment
damage or serious system failure. If you have questions or
need more information on installing and operating ASCO
equipment, contact ASCO.
Avertissements!
LISEZ LE MANUEL COMPLET AINSI QUE LES
PUBLICATIONS RELATIVE AU TRAVAIL À
EFFECTUER AVANT D’INSTALLER, D’UTILISER OU
DE MAINTENIR CET ÉQUIPEMENT.
• Suivez toutes les procédures et normes relatives à la
sécurité appropriées.
• Le non-respect des instructions peut entrainer des blessures
corporelles et/ou des dommages matériels
• Travaillez avec une extrême précaution à proximité des câbles
de puissance. Ces câbles peuvent présenter potentiellement
des tensions mortelles ou dangereuses.
• Avant de mettre l’équipement sous tension, faites vérifier
le câblage et les connexions par du personnel qualifié par
rapport aux plans du fournisseur. Un câblage et/ou des
connexions erronée peuvent endommager l’équipement
et provoquer une grave défaillance du système. Si vous
aves des questions ou avez besoin de plus d’informations
sur l’installation et l’utilisation des équipements ASCO,
contactez ASCO.
Normally Closed Construction: the RCS supplies air to
the process valve actuator through the “Process” port when
energized.
When a trip occurs:
Normally Closed Construction: the RCS blocks the incoming
pneumatic signal and connects the “Process” port to the
“Exhaust” port. This vents the air signal from the process valve
actuator and allows the actuator return spring to move the
process to its fail-safe position.
HARDWARE
For proper operation, a pneumatic pressure of 0-150 PSI must
be supplied to the RCS [process connection] while a pressure
of 40-150 PSI must be supplied to the [pilot connection]. It is
housed in a 24” x 20” x 10” enclosure. The primary components
include:
• Hard anodized aluminum manifold body
• Three low power solenoid-operated ISO-3 valves
• A key-actuated bypass valve. (Lever, Optional)
• Four Proximity Sensors
• An electrical terminal block for wiring termination (ATEX
rated Ex e IIC)
• Associated wiring.
Page 3 of 7 I&M_V_9959_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com
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