Bently Nevada 3500/32M Relay Module

Technical Specifications

Parameter	Details
Product Type	4-Channel Relay Output Module
Compatibility	Bently Nevada 3500 Series Monitoring System
Number of Channels	4 independent relay outputs
Contact Configuration	Form C (SPDT) per channel
Contact Rating	5 A at 250 VAC / 30 VDC (resistive)
Contact Material	Silver alloy with gold plating
Response Time	30 ms typical (from alarm condition to contact change)
Alarm Logic	User-configurable (danger, warning, alert)
Voting Options	1-out-of-1, 1-out-of-2, 2-out-of-2, 2-out-of-3
Latching Mode	Selectable (latching or non-latching)
Communication Protocol	Modbus RTU, Modbus TCP/IP
Dimensions (H x W x D)	241 mm x 38 mm x 254 mm
Weight	1.1 kg
Power Supply	24 VDC nominal (18 VDC to 32 VDC)
Power Consumption	6.0 W typical
Operating Temperature	–20 °C to +65 °C
Storage Temperature	–40 °C to +85 °C
Protection Class	IP20
Certifications	CE, CSA, ATEX, ABS

Flexible Relay Output Configuration

The 3500/32M 4-channel relay module provides a configurable interface between the 3500 monitoring system and external control circuits. This module features four independent form C relays, each configurable for a variety of alarm functions. Users can select from multiple voting options, including 1-out-of-1, 1-out-of-2, 2-out-of-2, and 2-out-of-3 logic. Such flexibility enables the module to support both simple alarm annunciation and complex safety shutdown strategies.

Robust Contact Performance

Each relay on the 3500/32M handles loads up to 5 A at 250 VAC or 30 VDC, making them suitable for driving contactors, solenoids, and annunciator panels. The gold-plated silver alloy contacts resist oxidation, ensuring reliable switching over extended service life. The module offers a response time of just 30 ms from alarm detection to contact transfer, providing timely protection for critical machinery.

Advanced Alarm Management

Operators can program the 3500/32M for latching or non-latching relay operation, depending on application requirements. Latching mode maintains the relay state even after the alarm condition clears, while non-latching resets automatically when the condition resolves. Moreover, the module includes a dedicated OK relay output that indicates overall system health, enabling remote diagnostics. Users can also configure time delays to prevent nuisance trips due to transient events.

Integration and Physical Design

Weighing 1.1 kg and occupying a half-height slot (38 mm width) in the 3500 rack, the 3500/32M saves valuable panel space. The module consumes only 6.0 W from a 24 VDC supply, minimizing thermal buildup within the enclosure. Its IP20-rated construction provides adequate protection for industrial control rooms. The module communicates seamlessly via Modbus RTU and TCP/IP, allowing integration with DCS, PLC, and SCADA systems.