Bently Nevada 3500/32M 149986-02 4-Channel Relay Module

Description

The 3500/32M with spare part number 149986-02 is a full-height module that delivers four highly configurable relay outputs for auto-trip execution and interlocking machinery protection. This 3500/32M 149986-02 module populates any designated slot located to the right of the Transient Data Interface (TDI) module inside a standard 3500 rack. Each relay output operates independently and can be programmed with sophisticated Alarm Drive Logic, integrating complex AND/OR voting logic combinations that evaluate Alert, Danger, Not-OK, and individual Proprietary Logic (PPL) variables sourced from any channel or group of channels across the protection chassis via the configuration utility.

Features

• Four fully independent single-pole double-throw (SPDT) relay channels.
• Custom voting configurations utilizing comprehensive onboard Alarm Drive Logic functions.
• Factory-installed 250 Vrms arc suppressors on each channel as a standard build feature.
• Hardware-switch-selectable operations allowing independent Normally De-energized or Normally Energized assignments.
• Front panel status tracking via distinct OK, TX/RX, and individual CH ALARM LEDs.
• Sealed contact assemblies featuring epoxy protection barriers.

Applications

• Emergency machinery shutdown loop initiation for industrial rotating equipment.
• Functional safety (SIL) machine trip systems.
• Critical multi-channel voting interlock setups for high-speed gas or steam turbines.
• Hazardous zone status annunciator signaling.

Technical Specifications

Installation Guidelines

• Rack Slot Selection: Slide the full-height front module into any available user slot located to the right of the Transient Data Interface (TDI) module inside the 3500 chassis.
• Rear Connection Assembly: Align and seat the matching 4-channel relay I/O module in the corresponding full-height rear slot directly behind the main control board.
• Hardware Operating Setup: Adjust the onboard physical switches to define the baseline state as Normally De-energized (ND) or Normally Energized (NE) for each individual channel before field wiring is tied in.
• Module Retention: Secure the front-panel panel fasteners fully to ground the module housing properly to the chassis structure.
• Logic Integration: Establish connection parameters, input tracking channels, and custom AND/OR structures using the 3500 Rack Configuration Software prior to going live.

Safety Precautions

• Voltage Restriction Compliance: When used in systems ordered with hazardous area approvals (Division 2/Zone 2 certified), the relay voltages must be strictly restricted to a maximum of 30 Vdc or 30 Vac. The module layout does not support standard increased physical spacing rules required for higher operating voltages under these certifications.
• Functional Safety (SIL) Limit: If integrated as a component within an active functional safety (SIL) loop, higher voltages are strictly prohibited. The functional safety certificate mandates adherence to the limited voltage levels.
• Electrical Shock Hazard: Isolate all external field wiring and circuits prior to working on terminal strips. This module can expose conductors to potential contact, introducing severe electrical burn or shock hazards under high-voltage configurations.