3500/33 149986-01D Bently 16-Channel Relay Module

Description

3500/33 149986-01D Bently 16-Channel Relay Module

Product Dimensions：

Product Description (Detailed Explanation)

The 3500/33 provides 16 relay outputs that are driven by alarm logic programmed in other modules within the 3500 rack (such as vibration, position, or temperature monitors).

• Logic Driven: The relays do not have their own sensors; instead, they act as the “hands” of the system, performing physical switching based on “Alert” and “Danger” statuses from across the rack.

• Voting Logic: It supports complex AND/OR voting logic (e.g., 2-out-of-3 or 1-out-of-2 logic) to ensure that a single sensor failure does not cause a false machine trip.

• Architecture: The system consists of the main 3500/33 module (installed in the front) and a corresponding Relay I/O Module (such as 149992-01, installed in the rear).

Product Parameters (Technical Specifications)

Product Advantages (Key Benefits)

• High Channel Density: Provides 16 independent relays in a single rack slot, maximizing cabinet space efficiency.

• Highly Programmable: Using the 3500 Rack Configuration Software, users can assign any combination of monitor alarms to any relay, providing total flexibility in machine protection schemes.

• Enhanced Safety: Supports “Fail-safe” (Normally Energized) or “Non-Fail-safe” (Normally De-energized) modes to match the safety philosophy of the plant.

• On-Board Diagnostics: The module continuously monitors its own health. If an internal fault is detected, the “Module OK” LED will extinguish, alerting maintenance personnel immediately.

Precautions (Important Notes)

• I/O Matching: The 3500/33 must be paired with the correct I/O module (e.g., 149992-01). Mixing different generations or types of relay I/O boards can lead to system errors.

• Arc Suppression: When switching inductive loads (like large solenoid valves or motor starters), external arc suppression (diodes for DC or RC snubbers for AC) must be installed to prevent contact pitting and EMI.

• Bypass/Inhibit: Before performing maintenance or testing alarms, ensure the “Rack Keylock” is in the PROGRAM position or that relays are software-inhibited to prevent accidental machine shutdowns (trips).

• Current Limits: Do not exceed the $5A$ rating. If you need to switch higher currents, use the 3500/33 to drive a larger interposing relay.

Product Applications (Typical Use Cases)

The 3500/33 is the primary interface between the monitoring system and the plant’s control/shutdown hardware:

• Automatic Shutdown (Trip): Instantly stopping a gas turbine or high-pressure compressor when vibration levels exceed safe “Danger” limits.

• Annunciator Interfacing: Sending signals to a central control room (DCS/SCADA) annunciator panel to trigger visual and audible alarms.

• Process Interlocking: Preventing a pump from starting if the lubrication oil temperature is too high or if shaft axial position is out of tolerance.

• System Status Signaling: Using one relay to signal the “Global Rack OK” status to a master safety PLC.

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