BENTLY 3500/53 133388-01 Relay Module

The BENTLY 3500/53 133388-01 is a versatile relay output module within the Bently Nevada 3500 Series machinery protection system. It provides 16 independently programmable relay channels that can be configured to respond to alarm conditions detected by monitoring modules such as the 3500/40M or 3500/42M. The module acts as an interface between the monitoring system and external devices like emergency shutdown systems, warning lights, horns, or programmable logic controllers (PLCs).

Functional Description

The 3500/53 receives alarm and status information from the rack’s monitoring modules via the internal communication bus. Each relay channel can be assigned to a specific alarm (e.g., Danger, Alert, Transducer OK) from any monitor channel. The relays are field‑replaceable and rated for various voltage and current levels, allowing direct switching of industrial control circuits. The module supports both latching and non‑latching relay modes, as well as failsafe or non‑failsafe operation.

Key Features

• 16 Independent Relays: Each relay provides Form C (SPDT) contacts.

• Flexible Logic: Relays can be programmed using AND/OR combinations of multiple alarm sources.

• High Contact Ratings: Typical ratings: 5A at 250 VAC or 30 VDC resistive.

• LED Indicators: Front-panel LEDs show the status of each relay (energized/de-energized).

• Configurable Modes: Latching, non-latching, failsafe, and time‑on/time‑off delays.

• Hot-Swappable: Modules can be replaced while the rack is powered, provided wiring is disconnected first.

Technical Specifications

• Relay Type: Electromechanical, SPDT, silver alloy contacts.

• Contact Ratings: 5 A @ 250 VAC, 5 A @ 30 VDC, 0.5 A @ 125 VDC.

• Isolation: 1500 VAC between coil and contacts.

• Response Time: Typically 20 ms from alarm assertion to relay change.

• Power Consumption: 5 VDC @ 500 mA (from rack backplane).

• Operating Temperature: -30°C to +65°C.

Applications

The 3500/53 is widely used to implement machinery protection logic. For example, it can trigger a turbine trip if a vibration monitor detects a Danger level, or activate a warning light if a temperature monitor goes into Alert. It is also used for annunciation in control rooms, providing a direct hardwired signal to distributed control systems (DCS) or safety instrumented systems (SIS).

Configuration and Integration

Using the 3500 System Configuration Software, users assign each relay to specific alarm conditions. The module stores its configuration in nonvolatile memory. The 133388-01 variant is a standard version; other options may include different contact materials or special certifications. The module occupies one slot in the 3500 rack and requires a 3500/20 Rack Interface Module for communication.

In summary, the BENTLY 3500/53 133388-01 relay module offers a reliable and flexible way to integrate the 3500 monitoring system with plant control and protection systems, ensuring timely response to machinery faults.