Description
The Triconex 8311N is a high-performance, chassis-mounted power supply module designed for use in Tricon Triple Modular Redundant (TMR) safety-instrumented systems. It provides reliable, filtered power to the Tricon backplane and I/O modules, ensuring continuous operation for critical safety functions.
Product Parameters (Datasheet)
- Model Number: 8311N
- Manufacturer: Schneider Electric (Triconex)
- Input Voltage: 24V DC nominal (Range: 22V to 31V DC)
- Output Power: 175 Watts
- Output Voltages: Provides +5.1V, +15V, -15V, and +24V to the backplane
- Efficiency: Typically 80% to 85%
- Cooling: Natural convection (requires proper rack ventilation)
- Status Indicators: Pass, Fault, and Alarm LEDs
- Isolation: 500V DC (Input to Output and Input to Chassis)
TRICONEX 8311N
TRICONEX 8311N
TRICONEX 8311N
Country of Origin
This safety-critical power module is manufactured by Schneider Electric (Triconex) in the United States, adhering to the strict quality and reliability standards required for SIL3 (Safety Integrity Level 3) applications.
Application Fields
The 8311N is a foundational component for safety and critical control systems:
- Emergency Shutdown (ESD): Providing power for the logic that shuts down oil and gas rigs in the event of a leak or fire.
- Burner Management Systems (BMS): Powering the controls for safe startup and operation of industrial boilers.
- Fire & Gas (F&G) Systems: Ensuring continuous power for gas detectors and fire suppression logic.
- Nuclear Power: Serving as the power source for safety-related control loops in nuclear facilities.
Product Usage Instructions
- Chassis Slotting: The 8311N must be installed in a dedicated power supply slot (typically on the left side) of a Tricon chassis. Ensure the module is fully seated and the thumbscrews are tightened.
- Redundancy Setup: For true TMR reliability, two 8311N modules should be installed in a single chassis. Each module is capable of powering the entire chassis, allowing for “Hot-Swapping” and redundant power feeds.
- Input Wiring: Connect the dual 24V DC power feeds to the rear of the chassis. Ensure that the feeds come from independent, high-reliability industrial power sources.
- Monitoring: Monitor the “Pass” LED (Green). If the “Fault” LED (Red) illuminates, the module has detected an internal failure and should be replaced immediately while the redundant module maintains system power.
- Grounding: Ensure the Tricon chassis is connected to a low-impedance safety ground to protect the 8311N from surges and electrical noise.
Product Technical Description
The 8311N functions as a sophisticated DC-DC converter. Technically, it is designed for maximum “fault tolerance.” Even if an internal component fails, the module is designed to fail in a way that does not damage the sensitive microprocessor-based I/O modules on the backplane. The “N” designation indicates it is a non-conformal coated version (standard industrial), though it still features the high-density capacitors and military-grade components characteristic of the Triconex line. It features an “Alarm” contact that can be wired to a remote annunciator to alert operators if one half of the redundant power system fails.
Q&A (Common Questions)
Q: Can I mix an 8311N with an 8310 (115V AC) module in the same chassis? A: No, you must use identical power supply models (both 8311N or both 8312) to ensure balanced load sharing and proper redundancy behavior.
Q: Is the 8311N hot-swappable? A: Yes. As long as a second functional power supply is present in the chassis, the 8311N can be removed and replaced while the system is under full control.
Q: What is the difference between the 8311 and the 8311N? A: Functionally they are the same; the “N” typically refers to specific manufacturing iterations or compliance certifications (such as Nuclear or updated RoHS standards) depending on the revision year.
Q: Does it power the field sensors? A: The 8311N powers the internal circuitry of the Tricon rack. While it provides 24V to the backplane, field instruments (like valves or transmitters) usually require a separate, external field power supply.
Similar Model Recommendations
- Triconex 8310 (115V AC Input variant)
- Triconex 8312 (230V AC Input variant)
- Triconex 8110 (High-density Main Chassis)
- Triconex 8111 (Expansion Chassis)
- Triconex 3008 (Main Processor Module)
For more information on the Triconex 8311N and other TMR safety system components, please contact our technical sales team.
