IM-IND-536985-RevAA-sec1
Installation & Maintenance Instructions
Advanced Redundant Control System (ARCS) Direct Acting Platform
User Experience Prerequisites
To eectively use the Pneumatic ARCS, 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. ese cables may have potentially lethal or dangerous
voltages.
• Prior to energizing the equipment, have qualied personnel
verify all wiring and connections against vendor drawings.
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.
PRODUCT DESCRIPTION
The Advanced Redundant Control System as ARCS is 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 ARCS uses 1oo2, 2oo2 or 2oo3 voting solenoids
to enhance the reliability of the circuit. The ARCS consists of
two or four electrically actuated solenoid valves (V1, V2, V3 &
V4) and a pneumatically operated (Manually Controlled) bypass
valve or isolation valve, and visual Indicators, Pressure switches.
The pressure switches provide solenoid state feedback and
are used during on-line testing of the ARCS unit. The bypass
valve or isolation valve allows for maintenance of the solenoid
valves without having to shut down the process valve. The use
of the Maintenance Bypass/Isolation valve is not required for
functional testing of the ARCS unit.
SERIES
141
Under normal operating conditions:
The ARCS allows for periodic testing of the solenoids by cycling
one solenoid valve automatically therefore attaining the desired
safety availability. This testing is performed online without the
need for bypassing/Isolating of the safety action and without
interruption of the process.
The ARCS supplies air to the process valve actuator through
the “Process” port when energized.
When a trip occurs:
The ARCS 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.
SPECIFICATIONS:
Manifold Architecture: Normally Closed
System Voltage: 12 VDC, 24 VDC, 48VDC, 120 VDC,
120/60-110/60 VAC or 230/50-240/50 VAC.
Operational Mode: De-Energized to trip.
Optional Features: Visual Indicators/Pressure gauge,
Pressure switches.
Dierential pressure: 0/1 - 10 bar [1 bar = 100kPa]
Maximum viscosity: 65 cSt (mm2/s)
Response time: 75 - 100 ms
Fluid: Dry & Non Lubricated Air
NOTE: Filtered (5 micron) instrument air recommended
Temperature Range (TS): -20°C to +60°C
Seal Materials: FPM
Pneumatic Valve:
3/2 solenoid operated valve.
Bypass Valve:
5/2 manually operated valve
Isolation Valve:
3/2 manually operated valve
Visual indicators:
Red – Air not available
Green – Air available
ASCO Valves
No. 57, Kundrathur Main Rd., Gerugambakkam, Chennai -6000128, India www.asco.com Page 1 of 4
®
E290699 - 01/2019 All Rights Reserved. IM-IND-536985-RevAA-sec1
Page 1 of 9
Pressure Switches:
SPDT switches, Steel, galvanised.
Switching function-Selectable: Normally open, normally
closed, change-over contact
Pneumatic Connections:
Inlet & Process:
¼” or ½” NPTF
Exhaust Port:
¼” NPTF
Approvals:
Exida
Certied SIL 3 capable
Lifting:
1. Don’t use valve body or enclosure to lift the system.
2. Don’t use Pressure switches or indicators to lift the system
WARNING: Explosion Hazard! Do not remove or
replace any component while circuit is live unless the
area is known to be non hazardous.
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Page 2 of 4 IM-IND-536985-RevAA-sec1
No. 57, Kundrathur Main Rd., Gerugambakkam, Chennai -6000128, India www.asco.com
ASCO components are intended to be used only within
the technical characteristics as specied on the nameplate.
Changes to the equipment are only allowed after consulting
the manufacturer or it’s representative. The solenoid valves
of Advanced Redundant Control System with ATEX/IEE Ex
certication is intended for installation in potentially explosive
atmospheres, ATEX category 2G, gas Group IIC. The surface
temperature classication depends on the voltage, wattage
and ambient temperature which are stated on the nameplate.
The ARCS should be mounted as closely to the process valve
as possible. In order to insure proper operation of the process
valve, tubing runs should be as straight and short as possible
Wiring Guidelines
The following general guidelines apply to all wiring discussed
in this document.
WARNING: Circuit power must be removed from
the device prior to disconnecting the wiring on either
the eld or internal side of the terminal strip.
• Wire size: stranded 16 and 18 AWG.
Bypass valve in
Normal mode.
Pressure
Gauge(3x)
Adaptor
(3x)
• The terminal clamps are designed for one wire only; DO
NOT attempt to terminate multiple wires into one terminal.
• Use care when running signal wiring near to or crossing
conduit or wiring that supplies power to motors, solenoids,
lighting, horns, bells, etc.
• AC power wiring should be run in a separate conduit from
DC power. All power wiring to and from the ARCS should
be in grounded conduit.
• The ARCS should be connected to a high quality instrument
grade ground with #14 AWG or heavier wire.
Electrical Connection (Customer Responsibility):
• In all cases follow local and national electrical codes and
conrm compliance with Zone 1 ATEX requirements.
• It is recommended that standard industry practices are
followed to prevent condensation from entering the
enclosure and, in some cases of Class I, Div. 2 or ATEX
Zone 1 conditions, to prevent hazardous gasses and vapors
from migrating through the conduit to the control room or
open ignition source.
REDUNDANT FUNCTIONS
• 1oo2 Manifold Assembly, without Online Maintenance &
without Diagnostic
• 1oo2 Manifold Assembly, with Common By-pass & without
Diagnostic
• 2oo2 Manifold Assembly, without Online Maintenance &
Diagnostic
• 2oo2 Manifold Assembly, without Online Maintenance,
with Diagnostic
• 2oo2 Manifold Assembly, with Common By-pass with
Diagnostic
• 2oo2 Manifold Assembly, with Individual Isolation with
Diagnostic
• 2oo3 Manifold Assembly, without Online Maintenance,
without Diagnostic
• 2oo3 Manifold Assembly, without Online Maintenance,
with Diagnostic
• 2oo3 Manifold Assembly, with Individual Isolation & with
Diagnostic
1oo2 REDUNDANT VALVE SYSTEM
1oo2 is for safe exhausting. It is enough to close one of the two
solenoid valves to exhaust the outlet. Each valve V1 & V2 are
channel 1&2.
1oo2 Manifold Assembly, without Online Maintenance &
without Diagnostic
1oo2 redundant valve system has two solenoid valves which are
connected in series (Normally closed valve). Valve 1 outlet is
connected to valve 2 inlet. Both valves are energized then outlet
will supply air to actuator. Any one valve gets fail/de-energized
system goes to vent position. Refer Fig-1 circuit and logic table.
CAUTION: De-energizing one or two valves will
initiate a shutdown.
Valve
Assembly (2x)
Manifold
Assembly
Mounting
Bracket
Fig: 1A
Exhaust
Silencer(2x)
1oo2 Manifold Assembly, with Common By-pass & without
Diagnostic: Bypass Mode
The manually operated maintenance bypass valve is used to
isolate and depressurize the solenoid valves. This function allows
to do maintenance of solenoid valve system without disturbing
the outlet air supply. Refer Fig-2 circuit and logic table.
Fig: 2
Valve
Assembly(2x)
Bypass valve
Exhaust
Silencer (2x),
Bypass valve
Manifold
Assembly
Lockout
Mounting
Bracket
Eyeball
Indicator (3x)
Exhaust Silencer(2x),
main
Fig: 2A shows 1oo2 Manifold ass embly with common bypass, with
visual indicator option
Fig: 2A
In “Normal” mode Bypass valve indicator will show red. When
switching to “Bypass” mode Bypass valve indicator will show
green.
Fig: 1
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No. 57, Kundrathur Main Rd., Gerugambakkam, Chennai -6000128, India www.asco.com
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