I&M V_9958_AA
ASCO Redundant Control System
2oo3B Enclosure without Diagnostics
2oo3BP Panel Mount without Diagnostics
Operation & Maintenance Guide
ASCO Valves® E301722 - 10/2020 All Rights Reserved. I&M V_9958_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 and Testing ..........................................6
2. Maintenance: Valve Replacement........................................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_9958_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com
Documentation Conventions
MOUNTING BRACKETS TOP (2)
PNEUMATIC MANIFOLD
MOUNTING BRACKETS BOTTOM (2)
PNEUMATIC CONNECTIONS
BREATHER/DRAIN
EXTERNAL GROUNDING/
EARTHING CONNECTION
INTERNAL GROUNDING/
EARTHING CONNECTION
FIELD WIRING TERMINAL BLOCK
ENCLOSURE NEMA 4, 4X
SIZE: 20" x 16" x 8"
SOLENOID OPERATED VALVE (S0V 1)
SOLENOID OPERATED VALVE (S0V 2)
SOLENOID OPERATED VALVE (S0V 3)
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 powerinput 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) 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
(SOVl, SOV2 & SOV3).
The RCS is available with a NEMA 4, 4x enclosure with terminal
strips (2oo3B) or as a stand alone panel mount version without
enclosure (2oo3BP).
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 automati-
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.
cally 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.
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.
For proper operation, a pneumatic pressure of 0 -150 PSI must be
supplied to the RCS INLET connection, and a pressure of 40 -150
psi supplied to the PILOT connection.
Figure 1A. RCS 2oo3B with Enclosure Components (Approx. Weight 29.5 kg., 65 lbs.)
Page 3 of 7 I&M V_9958_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com
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