I&M V_9957_AA
ASCO Redundant Control System
2oo2D Enclosure with Proximity Sensor Diagnostics
Operation & Maintenance Guide
ASCO Valves® E301722 - 10/2020 All Rights Reserved. I&M V_9957_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com Page 1 of 10
Operation & Maintenance Guide
Redundant Control System
Table of Contents
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� - Normally Open � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
1. General Operation and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2. Testing and Maintenance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Section 3� - Double Acting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
1. General Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2. Testing and Maintenance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Section 4� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
1. Functional Test Certication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2. Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Page 2 of 10 I&M_V_9957_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-two (2oo2) or one-out-of-one hot standby
(1oo1 HS) 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 2oo2 or 1oo1 HS voting solenoids to enhance the
reliability of the circuit. The RCS consists of two electrically actuated
solenoid valves (SOV1, SOV2) and a pneumatically operated (Manually
Controlled) bypass valve, and three 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 type of operation (2oo2 NC, 2oo2 NO, 2oo2 DA,
1oo1HS NC, 1oo1HS NO) must be specified by the customer at the time
of order.
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, three proximity sensors are included to provide
indication of each solenoid-operated valve and bypass valve position.
Normally Closed Construction: The RCS supplies air to the process
valve actuator through the “Process” port when energized.
Normally Open Construction: the RCS blocks the incoming
pneumatic signal and connects the “Process” port to the “Exhaust”
port when energized.
Double Acting Construction: the incoming pneumatic control
signal passes through the RCS to one side (C2) of the process valve
actuator while the other side (C1) of the process valve actuator is
vented through the RCS when energized. The 1oo1 HS mode cannot
be used with the double acting construction�
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.
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.
Normally Open Construction: the RCS supplies air to the process
valve actuator through the “Process” port. This allows the actuator to
move the process to its fail-safe position.
Double Acting Construction: (C2) of the process valve actuator is
vented through the RCS while the pneumatic control signal is applied
to (C1) of the process valve actuator. This causes the process valve
actuator to move from its normal operating position 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 20” x 16” x 8”
enclosure. The primary components include:
• Hard anodized aluminum manifold body
• Two low power solenoid-operated ISO-3 valves
• A key-actuated bypass valve. (Lever Optional)
• Three proximity sensors/switches
• An electrical terminal block for wiring termination (ATEX
rated Ex e IIC)
• Associated wiring.
Page 3 of 10 I&M_V_9957_AA
©
ASCO, L.P. 160 Park Avenue, Florham Park, New Jersey 07932 www.emerson.com
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