Bently Nevada 128275-01 High-Reliability Relay Output Module

Product Overview
The Bently Nevada 128275-01 is an 8-channel relay output module designed for critical machinery protection systems. It converts alarm and trip signals from vibration, displacement, or speed monitoring modules into physical dry contact outputs to trigger safety actions such as equipment shutdown or alarm activation. The module adheres to API 670 standards and is widely used in industries where machinery reliability is paramount, including power generation, oil and gas, and petrochemicals.

Category:
Description

Technical Specifications

  • Channels: 8 independent relay outputs
  • Relay Type: Form C (SPDT) dry contacts, supporting both NO (Normally Open) and NC (Normally Closed) configurations
  • Contact Ratings:
    • 2 A at 30 V DC (resistive load)
    • 1 A at 120 V AC
    • Maximum switching power: 60 W DC / 120 VA AC
  • Response Time: <10 ms (typical)
  • Redundancy Support: Yes, supports 2oo2 (Two-out-of-Two) voting logic for enhanced safety integrity (requires two modules)
  • Electrical Isolation: Channel-to-backplane isolation ≥500 V RMS
  • Power Supply: +24 V DC via 3500 series rack backplane
  • Operating Temperature: 0°C to +65°C
  • Certifications: CE, UL/cUL, IEC 61010-1, API 670 (5th Edition)

Key Features

  • High Reliability: Designed for decades of continuous operation in harsh industrial environments.
  • Flexible Configuration: Each channel can be independently set to “Alarm” or “Danger” mode, with programmable thresholds.
  • Dual Output Logic: Form C contacts enable self-testing loops and compatibility with diverse safety systems.
  • Redundant Operation: Supports 2oo2 voting to meet SIL 2/3 requirements when paired with another module.
  • Visual Indicators: Front-panel LEDs display channel status for quick diagnostics.
  • Hot-Swappable: Can be replaced without powering down the 3500 series rack.
  • Remote Configuration: Integrated with Bently Nevada’s System 1 software for parameter setup and monitoring.

Functional Characteristics

  • Signal Conversion: Translates internal logic signals from monitoring modules (e.g., 3500/22M, 3500/42M) into physical relay actions.
  • Alarm Management: Triggers local or remote alarms based on predefined thresholds.
  • Trip Logic: Executes equipment shutdown sequences during abnormal conditions.
  • Self-Testing: Supports periodic relay testing to detect contact degradation.
  • Event Logging: Records relay activation history for post-incident analysis.

Application Scenarios

  • Power Generation: Turbine overspeed trips, generator bearing vibration protection.
  • Oil & Gas: Compressor axial displacement interlocks, centrifugal pump dry-run protection.
  • Petrochemicals: Reactor stirrer imbalance shutdown, large fan surge protection.
  • Metallurgy & Cement: Kiln main motor vibration high interlocks, mill gearbox temperature trips.
  • Legacy System Upgrades: Replaces older 3300 or 3500/50 non-redundant relay modules to enhance safety.
  • Critical Machinery: Any rotating equipment requiring fail-safe relay outputs to DCS, PLC, or ESD systems.
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