The ASCO Redundant Control System (RCS) is the only pilot valve system that has no single point of failure that could result in an unwanted closure of the process valve. The Redundant Control System is fit for use in SIL 3 applications and greatly reduces spurious trip rates. RCS achieves a higher level of process safety and reliability by using a redundant, fault tolerant architecture, high diagnostic coverage, and automated testing. A keyed bypass allows on-line maintenance of the RCS without process interruption. The RCS is available in a variety of constructions that provide valve diagnostics through automated, online testing.
ASCO's Redundant Control System Provides:
- Process reliability and valve diagnostics, for safety instrumented applications up to SIL 3
- The industry's best choice for process valve diagnostics and actuation
- Complete functional safety with enhanced reliability
Features
Redundant Control System Features:
- High Reliability Architecture – Redundant solenoid configuration (2oo2 / 1oo1HS)
- Eliminates single point of failure
- Functional Safety compliant – SIL 3 capable
- Automated diagnostic capability
- Online solenoid testing
- Partial stroke testing
- Maintenance bypass for online servicing
- Three pressure switches for feedback
- Integrated PLC option available
- Hazardous area & ATEX compliant designs
Specifications
Redundant Control System Specifications:
| System Type | Redundant pneumatic pilot valve control system |
| Voting Logic | 2oo2 / 1oo1HS / 2oo3 |
| Operational Modes | Energize to Trip / De‑energize to Trip |
| Constructions | Normally Closed / Normally Open / Double Acting |
| Solenoids | Dual or Triple redundant |
| Feedback | Pressure switches / GO Switches |
| Enclosure | Fiberglass / 304 SS / 316 SS |
| Voltage | 12–240 V (AC/DC options) |
| Safety Integrity | SIL 3 capable |
| Diagnostics | Automated SOV & PST testing |
Applications
Redundant Control System Applications:
- Emergency Shutdown Systems
- Burner Management Systems
- HIPPS
- Flaring Systems
- Isolation Valves
- Refineries
- Oil & Gas Production
- Power Plants
- Chemical Processing
- Process Valve Actuation
Q & A
Redundant Control System Q & A:
In 2oo2 architecture, both solenoids must change state for the valve to trip. This reduces false trips and improves availability.
One solenoid operates as primary while the second remains energized as backup, ready to take over if the primary fails.
Three solenoids are used, and any two must actuate to trip the valve. This increases fault tolerance and safety availability.
2oo3 Basic has no diagnostics or maintenance bypass. 2oo3D includes GO Switch diagnostics, bypass, and online testing.
Diagnostics include pressure switch feedback, GO Switch monitoring, solenoid testing, and partial stroke testing.
Downloads
Download ASCO Redundant Control System Brochure
Talk to one of our experts today at (855) 737-4714, or fill out our online form to learn more.