Product Core Brief
- Model: T8231
- Brand: ICS Triplex (Rockwell Automation)
- Series: Trusted TMR Safety Control Series ⚠️ EOL — limited new surplus stock remaining
- Core Function: Deliver regulated 24–28 VDC backplane power to TMR CPU, communication and I/O modules with full overload and overvoltage protection
- Product Type: Rack-mount hot-swappable TMR power pack supply module
- Key Specs: 750 W continuous rated output | Dual redundant AC input | N+1 parallel redundancy capable | Condition: New Original Surplus
Product Introduction
The ICS Triplex is the primary rack power pack for Trusted SIS chassis, supplying stabilized DC power to critical safety hardware including the T8110B CPU and T8451 digital output modules. It supports parallel N+1 stacking to eliminate single-point power loss for high-availability ESD systems.This unit outperforms smaller T8232 power supplies via its 750 W total capacity and extended -40 °C cold-start rating. OEM environmental testing validates stable full-load operation across the full -40 °C to +70 °C ambient window.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Continuous Output Power | 750 W maximum full load |
| Nominal DC Output Range | 24 VDC to 28 VDC regulated backplane supply |
| AC Input Configuration | Dual redundant universal 85–264 VAC single-phase input |
| Parallel Redundancy Mode | N+1 hot-parallel sharing for fault-tolerant power pools |
| Output Ripple Noise | <240 mV peak-to-peak at full rated load |
| Overload Protection | Latching cutoff at 105–125% continuous load, auto-reset after fault clear |
| Overvoltage Threshold | 115–135% nominal DC output latch shutdown |
| Hot-Swap Support | Full live rack replacement without chassis power shutdown |
| Operating Ambient Temp | -40 °C to +70 °C; storage -40 °C to +85 °C |
| Safety & Hazard Certifications | IEC 61508 SIL 3, TÜV AK6, UL/cUL, CE, ATEX Ex nA IIC T4 Zone 2 |
| Cooling System | Dual internal axial cooling fans with runtime diagnostic monitoring |
| Physical Dimensions | 305 mm H × 60 mm W × 260 mm D; net weight 1.24 kg |
| Enclosure Rating | IP20, cabinet-only rack mounting |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross serial numbers against Rockwell OEM batch manifests to reject counterfeit aftermarket copies. Visually inspect dual fan assemblies for blade damage, AC terminal block cracking, and front panel status LED lens scratches.
- Live Functional Test: Insert module into a Trusted chassis test rack with dual 120 VAC Fluke 115 AC supplies, pair with a T8110B CPU and fully loaded T8451 I/O bank. Run a 24-hour soak cycle at 750 W simulated resistive load, log output ripple and fan speed hourly.
- Electrical Parameter Test: Use a 500 V Megger to measure insulation resistance between AC input terminals and chassis ground; pass threshold is >10 MΩ. Trigger overload cutoff to verify latching fault behavior and auto-reset recovery.
- Component Verification: This power pack contains no user-configurable firmware. Record fan runtime factory preset thresholds and photograph AC input jumper selection positions for site wiring reference records.
- Final QC & Packaging: Place full power pack assembly inside a static-dissipative poly bag. Affix dated QC Pass sticker listing measured output ripple and total full-load soak test runtime before palletized storage.
Replacement Pitfall Guide
❗ Redundancy Parallel Mismatch Risk: Mixing 750 W units with smaller T8232 400 W power packs in the same N+1 pool creates uneven load sharing. The smaller unit hits overload cutoff under normal chassis draw.❗ AC Input Single Feed Misconfiguration Risk: The requires two independent AC power feeds for full redundancy. Running only one input rail drops power capacity by 50% and disables cross-feed fault tolerance.❗ Backplane Load Headroom Miscalculation Risk: A fully populated Trusted chassis with T8110B CPU + eight T8451 I/O modules draws 680 W steady-state. Size N+1 power pools with 20% overhead; single units lack reserve for transient valve surge loads.❗ Cooling Airflow Obstruction Risk: Front and rear fan vents require minimum 50 mm unobstructed clearance. Blocked airflow pushes internal temp past +70 °C and triggers thermal shutdown interlocks.❗ ESD Damage Risk: Exposed backplane edge contacts remain unprotected during hot-swap removal. Use a grounded anti-static mat in low-humidity cabinet spaces; static discharge damages internal PWM control circuits and generates uncommanded voltage sag faults.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- T8110B (Trusted TMR Safety CPU) → : Native Compatible — Direct backplane power feed, no voltage adapter hardware required
- T8451 (40-Ch Digital Output I/O Module) → : Native Compatible — Matched 24–28 VDC field/backplane operating range
- T8232 (400 W Small Power Pack) → : Needs Adaptation — Parallel load balancing parameters must be re-tuned in chassis setup software
Benchmarks
- Full 750 W load output ripple: 186 mV peak-to-peak (240 VAC dual input, 25 °C ambient)
- Parallel N+1 load sharing deviation: <3% power split between two matched units at full chassis draw
- Continuous power efficiency: 91.4% average under mixed CPU + I/O steady-state load
