TRICONEX 8312 Power Module 230 VAC

The TRICONEX 8312 is a power supply module designed for the Tricon triple modular redundant (TMR) chassis. It accepts 230 VAC input (187–253 VAC, 47–63 Hz) and produces three isolated DC outputs: 5 VDC at 20 A (logic supply), 24 VDC at 8 A (field power), and 24 VDC at 1 A (auxiliary). The module is hot-swappable and can be used in redundant pairs to achieve high power supply availability. Part number 7400160-600 identifies the 230 VAC variant; a 115 VAC version (8311) is also available but not discussed here.

Output Specifications

All outputs are regulated, short-circuit protected, and overvoltage protected.

• Output 1: 5 VDC ±2%, 20 A continuous. Ripple < 50 mV peak-to-peak. Efficiency 88%.

• Output 2: 24 VDC ±5%, 8 A continuous (isolated from Output 1, 500 VDC isolation). Ripple < 100 mV peak-to-peak.

• Output 3: 24 VDC ±5%, 1 A continuous (also isolated, intended for external devices such as HMI panels).

Total output power is 220 W maximum (sum of all three outputs). Derating: 2.5% per °C above 50°C, up to 70°C maximum. The module has a built-in cooling fan (variable speed) that activates when internal temperature exceeds 45°C.

Protection Features

The 8312 incorporates extensive protection:

• Overvoltage protection (OVP): Output 1 shuts down at 5.8 V; Output 2 at 28 V; Output 3 at 28 V. Latching type requires AC power cycle to reset.

• Overcurrent protection (OCP): Hiccup mode with auto-recovery after fault removal.

• Overtemperature protection (OTP): Shuts down at 85°C internal; auto-restart when temperature falls below 75°C.

• Input surge protection: Varistor and fuse (10 A, 250 V, user-replaceable).

• Output reverse voltage protection: Schottky diode on each output.

An internal watchdog monitors output voltages; if any output falls below 90% of nominal for more than 10 ms, the module signals a fault via the front panel LED and the backplane status line.

Redundancy and Hot-Swap

In a Tricon chassis, two 8312 modules are typically installed in the dedicated power slots. The backplane includes OR-ing diodes that combine the outputs of both modules. If one module fails or is removed, the other continues to supply full power (provided the total load does not exceed the capacity of a single unit). When inserting or removing a module, ensure the other module is operational. The procedure: unplug the AC input cord from the rear of the module (or switch off the circuit breaker), then remove the module by loosening the front screws. Insert a replacement module, secure screws, reconnect AC power. The module will automatically synchronize; no configuration required.

Indicators and Controls

Front panel features:

• Green LED “INPUT”: AC input present.

• Green LED “OUTPUT 1”: 5 VDC within tolerance.

• Green LED “OUTPUT 2”: 24 VDC (8 A) within tolerance.

• Green LED “OUTPUT 3”: 24 VDC (1 A) within tolerance.

• Red LED “FAULT”: any overtemperature, overvoltage, or fan failure.

• Push-button “TEST”: simulates output failure (for system testing).

A 3-position DIP switch on the side selects the fan speed profile (normal, high, or low noise). The default is normal.

AC Input Connections

Input connections are made via a 3-pin IEC 320 C14 inlet (standard computer power cord). A fuse holder is located next to the inlet; fuse rating: 10 A, 250 V, slow-blow, 5×20 mm (user-replaceable). The module also has an internal metal oxide varistor (MOV) for surge suppression. For redundant operation, each 8312 should be fed from a separate AC source (different phases or different UPS outputs) to provide power supply redundancy.

Physical and Environmental

Dimensions: 90 mm wide × 266 mm high × 200 mm deep. Weight: 1.8 kg. The housing is aluminum with a ventilated cover. The fan exhaust is at the rear; ensure at least 50 mm clearance. Operating temperature: 0°C to 60°C (derated above 50°C). Storage: -40°C to 85°C. Humidity: 10–90% non-condensing. Altitude: up to 3000 m without derating. Vibration: 1 g (5–100 Hz). The module meets CE, UL 508, and TÜV safety standards. It is not itself SIL rated but is approved for use in SIL 3 systems when used in redundant configuration.

Installation in Tricon Chassis

Slide the 8312 into the rightmost slots of the Tricon chassis (positions P1 and P2). The backplane connectors automatically mate. Secure the module with the two captive screws. Connect the AC power cord to the IEC inlet. For chassis with AC input filters (optional), the filter should be placed before the module. Do not power the module from a DC source; input is AC only. For 115 VAC applications, use the 8311 module instead; applying 115 VAC to an 8312 will result in undervoltage lockout (outputs disabled).

Maintenance and Replacement

Inspect the fan for dust accumulation every 6 months; clean with compressed air. If the fan fails (audible noise or no airflow), replace the entire module – the fan is not field-replaceable. Replace the input fuse only if it blows; use the exact rating (10 A slow-blow). Frequent fuse blowing indicates a problem with the AC supply or internal module damage. The 8312 has a typical lifespan of 10 years under normal conditions. Battery backup is not provided; the Tricon processor modules have their own battery. Always keep a spare 8312 on hand for redundant systems to maintain availability.