Bently Nevada 3500/32M 125720-01 Relay Module

Detailed Technical Specifications

Functional Overview and Alarm Management

This module provides four independent relay outputs for the 3500 Series monitoring system. It translates alarm signals from the monitoring software into physical contact closures. The 3500/32M 125720-01 then drives external devices like alarms, solenoids, or trip circuits. Each relay operates independently, allowing flexible configuration for different machine protection strategies. Moreover, you can assign each channel to a specific measurement variable. This flexibility enables customized alert responses for vibration, temperature, or position thresholds. The module directly interfaces with the 3500 rack backplane for seamless data exchange.

Relay Architecture and Contact Configuration

Each relay within the Bently Nevada 3500/32M 125720-01 offers Form C contacts with normally-open and normally-closed terminals. This configuration supports both fail-safe and non-fail-safe wiring schemes. The silver alloy contacts with gold plating ensure reliable switching over thousands of cycles. Furthermore, the module includes built-in snubber circuits for contact protection. These circuits suppress inductive kickback from relay coils and external loads. Consequently, the module delivers extended service life in demanding industrial environments. The front panel LED indicators show the real-time status of each relay channel.

Physical Design and Interface Connectivity

The module occupies a single slot in the 3500 chassis, saving valuable panel space. Its 25 mm width accommodates high-density installations with multiple modules. The 241 mm height aligns uniformly with adjacent modules for a professional appearance. Additionally, the 200 mm depth provides adequate clearance for rear wiring and cable ducts. The 20-pin ARINC connector on the front panel offers a secure, locking interface. This connector simplifies field wiring and maintenance procedures. The rear backplane connector handles power delivery and communication with the main processor. The integrated 100 µF capacitance ensures stable operation during momentary power interruptions.

Operational Environment and Compliance Standards

The module operates reliably in temperatures from 0°C to +65°C. Storage temperatures range from -40°C to +85°C for flexibility. The unit also meets CE and UL requirements for global industrial applications. Install the module in a dry, dust-free control cabinet for optimal performance. The module performs automatic self-diagnostics on power-up to verify relay integrity. Regular functional testing every 12 months ensures continued reliability. This maintenance schedule aligns with typical plant turnaround cycles.