Product Description

The 3500/32 (125720-01) is a four-channel relay module designed for the Bently Nevada 3500 Series Machinery Protection System. This module provides a reliable physical interface for alarm and machinery shutdown logic. It is typically utilized to translate software-configured alarm states from various monitoring modules (such as vibration, thrust, or temperature monitors) into discrete dry contact outputs for external control systems or emergency shutdown devices (ESD).

Each of the four relay channels on the 125720-01 can be independently programmed via the 3500 Rack Configuration Software. This flexibility allows engineers to implement complex "AND" or "OR" voting logic, ensuring that machinery trips only occur under genuine fault conditions. The module's design emphasizes fail-safe operation and robust isolation, maintaining signal integrity even in electromagnetically noisy industrial environments.

Technical Specifications

• Module Type: 4-Channel Relay I/O Module (Half-height)

• Part Number: 125720-01

• Compatible Series: Bently Nevada 3500

• Number of Channels: 4 Independent Relays

• Relay Type: Single-Pole, Double-Throw (SPDT) / Form C

• Contact Ratings (Resistive):

• 5A @ 24V DC / 120V AC

• Max Voltage: 125V DC / 250V AC

• Operating Temperature: -30 °C to +65 °C (-22 °F to +150 °F)

• Storage Temperature: -40 °C to +85 °C (-40 °F to +185 °F)

• Humidity: 95% non-condensing

• Dimensions (H x W x D): 241 mm x 24.4 mm x 99.1 mm

• Weight: 0.4 kg (0.88 lbs)

• Mounting: Installs in the rear I/O slots of the 3500 rack

Functional Capabilities

• Independent Configuration: Each relay can be assigned to different alarm levels (Alert/Danger) from any monitor module in the rack.

• Voting Logic: Supports complex system-wide voting, such as 2-out-of-4 or 1-out-of-2 logic, across multiple racks if necessary.

• Normally Energized/De-energized: User-selectable relay states to accommodate fail-safe or non-fail-safe protection philosophies.

• Trip Multiply Integration: Relays can be set to ignore alarms during machine startup phases when Trip Multiply is active.