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T8442

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T8442
May 15, 2026

T8442

The T8442 is a Trusted TMR Speed Monitor Module designed for safety-critical rotating machinery protection (turbines, compressors, generators). It provides triple-modular redundant (TMR) speed/acceleration monitoring and quadruple redundant fault-tolerant shutdown outputs for overspeed and over-acceleration protection. It operates as a self-contained fault-tolerant control subsystem inside the Trusted T8000 SIS, supporting up to three independent machine groups (e.g., three turbine trains) in one module.

Description

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1. Introduction

The T8442 is a Trusted TMR Speed Monitor Module designed for safety-critical rotating machinery protection (turbines, compressors, generators). It provides triple-modular redundant (TMR) speed/acceleration monitoring and quadruple redundant fault-tolerant shutdown outputs for overspeed and over-acceleration protection.
It operates as a self-contained fault-tolerant control subsystem inside the Trusted T8000 SIS, supporting up to three independent machine groups (e.g., three turbine trains) in one module.

  • Function: TMR speed/acceleration monitoring + quad redundant safety shutdown outputs

  • Machines: Up to 3 rotating machine groups (turbines/compressors/generators)

  • Inputs per group: 3 × TMR speed channels (active/passive probes)

  • Outputs per group: 2 × quad redundant fault-tolerant shutdown structures

  • Safety: IEC 61508 SIL 3 (TÜV)

  • Architecture: HIFT (Hardware Implemented Fault Tolerance), 3‑2‑0 TMR

  • Isolation: 2500 VDC opto/galvanic isolation

  • SOE: 1 ms time‑stamp resolution

  • Hot‑swap: Supported (Companion Slot / SmartSlot)

2. Product Overview

The T8442 is a single‑width, 6U TMR speed monitor module for T8100 / T8400 chassis. It integrates three independent machine protection groups, each with:

  • 3 × TMR speed input channels (for 3 speed probes per machine)

  • 2 × quad redundant, volt‑free shutdown output structures

Key features:

  • 3 machine groups (supports 3 turbines/compressors)

  • TMR speed inputs (active/passive probe compatible)

  • Quad redundant fault‑tolerant safety shutdown outputs

  • Overspeed / over‑acceleration detection & trip

  • 2500 VDC opto/galvanic isolation (field ↔ system)

  • 1 ms resolution SOE logging

  • Hot‑swap & hot‑standby (companion slot)

  • Comprehensive on‑board diagnostics & self‑test (BIST)

  • Front‑panel LED status indicators (module + groups + I/O)

  • High accuracy: 0.1% FS speed measurement

3. Specifications

3.1 Mechanical

  • Form Factor: T8000 chassis single‑width module, 6U height

  • Dimensions (H × W × D): 266 mm × 31 mm × 303 mm

  • Weight: Approx. 1.2–1.3 kg

  • Mounting: T8100 / T8400 chassis slots 1–16

  • Termination: T8846 Speed Input FTA (SIFTA)

3.2 Electrical

  • System Supply: 20–32 VDC (nominal 24 VDC)

  • Power Consumption: ≤ 22 W

  • Speed Inputs (per group): 3 × TMR channels

    • Probe Types: Active (24 VDC) / Passive (magnetic pickup)

    • Frequency Range: 0–10 kHz

    • Isolation: 2500 VDC opto/galvanic

  • Shutdown Outputs (per group): 2 × quad redundant volt‑free

    • Contact Rating: 2 A @ 250 VAC (resistive)

    • Isolation: 2500 VDC galvanic

3.3 Functional

  • Redundancy: TMR (inputs), Quad redundant (outputs)

  • Voting: 1oo2D per TMR slice; quad fault‑tolerant outputs

  • Monitoring: Speed, acceleration, overspeed, over‑acceleration

  • Diagnostics:

    • Probe open/short/fault

    • TMR mismatch

    • Output contact health

    • On‑board BIST (periodic self‑test)

  • SOE Resolution: 1 ms

  • Response Time: ≤ 1 ms (trip action)

  • Filtering: Configurable noise rejection

3.4 Environmental

  • Operating Temperature: –20 °C to +60 °C

  • Storage Temperature: –40 °C to +85 °C

  • Humidity: 5–95 % RH, non‑condensing

  • Vibration: 10–57 Hz ±0.075 mm; 57–150 Hz 1.0 g

  • Shock: 15 g, ½ sine wave, 11 ms

3.5 Safety & Certification

  • Safety Standard: IEC 61508 SIL 3 (TÜV Certified)

  • Approvals: CE, UL, CSA, ATEX, IECEx

  • Fault Tolerance: TMR 3‑2‑0; quad redundant outputs

  • PFHd: < 1.0 × 10⁻⁹ / hour (SIL 3)

4. Front Panel Indicators

  • PWR (Green): ON = module power healthy

  • RUN (Green): ON = active; FLASHING = BIST/initialization

  • FAULT (Red): ON = critical fault; FLASHING = minor fault

  • COM (Green): FLASHING = backplane communication active

  • G1/G2/G3 LEDs: Machine group status + speed/ trip indication

5. Installation

  • Chassis: Insert into any vacant slot in T8100 / T8400 chassis

  • Hot‑Swap: Supported (Companion Slot / SmartSlot)

  • Front‑Panel Screws: Torque 0.8–1.0 Nm

  • Termination: Connect to T8846 SIFTA for field probes

6. Wiring

  • Speed Probes:

    • Active: 24 VDC power + signal

    • Passive: Magnetic pickup (2‑wire)

  • Shutdown Outputs: Volt‑free contacts to ESD/trip circuits

  • Wire Gauge: 16–22 AWG stranded

  • Terminal Torque: 0.5–0.6 Nm

7. Operation

  • Power‑Up: PWR ON; RUN flashes during BIST (5–10 s)

  • Normal: PWR/RUN steady green; FAULT OFF; COM flashing

  • Faults:

    • FAULT ON: TMR mismatch, probe fault, output fault

    • FAULT FLASHING: Single‑path fault, minor mismatch

  • Trip Action: Overspeed/over‑acceleration triggers quad redundant shutdown outputs (≤1 ms)

  • SOE: All speed threshold crossings & trips time‑stamped at 1 ms

8. Ordering Information

  • T8442: Standard TMR speed monitor (–20 °C to +60 °C)

  • T8442C: Conformal coated (harsh environment, extended temp)

  • T8846: Speed Input FTA (SIFTA)

  • T8100 / T8400: Trusted chassis


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