Component Snapshot At-a-Glance

• Model: 8310N2
• Alt. P/N: Base standard 8310; 8310N = light coating; 8310N2 = full heavy-duty conformal coated offshore variant
• Product Series: Triconex Tricon Triple Modular Redundant (TMR) SIS Safety Instrumented System
• Hardware Type: Chassis left-slot rack-mount universal AC/DC input power conversion module
• Key Feature: Full PCB conformal coating for salt fog/chemical vapor, 175W continuous 6.5VDC output, parallel 1oo2 redundant load sharing, hardwired SPDT fault alarm contacts
• Primary Field Use: Converts plant 120V-class mains to regulated 6.5VDC TriBus backplane power for all Tricon MP, analog/digital I/O and communication modules in SIL3 ESD/F&G safety racks.

Hard-Numbers: Technical Specifications

• Protocol Support: No user data protocol; TriBus backplane power distribution + internal fault diagnostic reporting to main processors
• Port Count: Rear terminal block for AC/DC mains input, SPDT fault alarm relay contacts; backplane edge connector for 6.5VDC power distribution
• Input Voltage Range: 85–140VAC (47–63Hz) OR 95–180VDC dual universal input
• Operating Temperature: 0°C to +60°C operational; -40°C to +85°C storage
• Isolation Rating: 1500VAC galvanic isolation between mains input and low-voltage TMR backplane circuits
• Power Draw Input: Max 2.8A @120VAC; max 2.1A @125VDC
• DC Output Rating: 6.5VDC ±1% tight regulation, 27A continuous, total 175W rated output
• Hold-Up Time: Minimum 20ms output hold during brief input power loss
• Protection Circuits: Overvoltage, overcurrent, short-circuit, thermal shutdown, EMI input surge filtering, time-delay input fuse
• Front Panel Diagnostics: PASS, FAULT, ALARM, TEMP status LEDs
• Alarm Relay Contact Rating: 1A @120VAC dry SPDT fault contacts for DCS fault interlock
• Internal Thermal Trip Threshold: 83°C triggers overtemperature warning derate
• Hot-Swap Capable: Yes, internal hold-up capacitors maintain stable backplane voltage during live module replacement
• Certifications: IEC 61508 SIL3, ATEX Zone 2, UL, CE, ISA-84, offshore marine conformal coating rating
• Dimensions (H×W×D): 369mm × 156mm × 88mm
• Weight: 3.67kg

The Real-World Problem It Solves

Uncoated base 8310 and lightly coated 8310N PCBs corrode rapidly in offshore FPSO, coastal refinery salt fog and chemical vapor environments. Single power supply layouts create full SIS shutdown single-point failure risk violating SIL3 compliance. Separate external alarm relays add extra field wiring to notify DCS of power supply faults.Where you’ll typically find it:

• Refinery reactor, distillation unit ESD emergency shutdown safety racks
• Offshore drilling rig & FPSO fire/gas (F&G) high-integrity safety control cabinets
• Fossil power plant boiler, turbine burner management SIL3 safety instrumented systems

This heavy-duty fully coated redundant power supply runs in parallel paired configurations, cleans noisy plant mains transients, and provides hardwired fault signaling without auxiliary external relays.

Hardware Architecture & Under-the-Hood Logic

Passive AC-DC power conversion board without signal processing CPU; dedicated parallel load-sharing circuitry enables two 8310N2 modules to evenly split full rack load in 1oo2 redundancy.

1. Universal AC/DC input feeds multi-stage EMI filter and surge suppression circuits to suppress plant mains spikes.
2. PFC rectifier converts wide-range mains voltage to stable high-voltage internal DC bus.
3. Isolated DC-DC converter generates tightly regulated 6.5VDC to feed the TriBus rack backplane.
4. Independent current-limiting and thermal protection logic cuts output to protect all TMR modules during overload or overheat.
5. Onboard fault monitoring logic drives front panel status LEDs and rear hardwired SPDT fault alarm relay contacts.
6. Built-in hot-swap hold-up capacitors sustain backplane voltage minimum 20ms during live module removal and insertion.
7. Parallel load-sharing circuits balance power draw evenly between dual redundant 8310N2 power supplies.
8. Full conformal coating fully encapsulates all PCB traces, ICs and passive components to block salt dust, moisture and corrosive chemical vapor.

Field Service Pitfalls: What Rookies Get Wrong

Deploying single 8310N2 without second redundant power supply for SIL3 safety loopsInstallers only fit one power module to save rack slots. Single supply setup creates unmitigated single point of failure, invalidating safety certification for the entire SIS rack.

• Field Rule: All safety instrumented racks require two matched 8310N2 modules installed in parallel redundant configuration.

Under-torquing rear mains terminal lugs creating thermal hotspotsLoose AC/DC wiring terminals generate high resistance heat buildup. Internal temperature climbs above 83°C, triggering persistent overtemperature fault alarms and automatic power derating.

• Quick Fix: Use 14–16AWG stranded copper wire; torque rear terminal screws to 0.9Nm; retorque all power terminals after seasonal plant thermal cycling.

Blocking chassis left-side ventilation with dense power cable bundlesRouting heavy mains wiring looms directly against the 8310N2 side cooling vents restricts natural passive airflow. Sustained high ambient temperature reduces maximum output wattage and accelerates conformal coating degradation.

• Field Rule: Maintain minimum 30mm clear airflow space on left and right sides of power slot; strictly separate mains power wiring and low-voltage signal wiring trays.

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.