Description
Detailed parameter table
| Parameter name | Parameter value |
| Product model | 3500/20 125744-02 |
| Manufacturer | Bently Nevada |
| Product category | Machinery Protection System Rack Assembly |
| Slot configuration | 10 module slots (accommodates 1-slot and 2-slot modules) |
| Backplane type | High-speed data and power distribution bus |
| Power input | Redundant power supply connections (from 3500/22M modules) |
| Cooling method | Convection cooling with optimized airflow design |
| Material construction | Powder-coated aluminum frame with steel mounting brackets |
| Dimensions | 686 mm (H) × 356 mm (W) × 254 mm (D) (27.0″ × 14.0″ × 10.0″) |
| Weight | 7.3 kg (16.1 lbs) without modules |
| Operating temperature | 0°C to +60°C (32°F to +140°F) |
| Mounting options | Panel mount, rack mount, or wall mount |
| Compatibility | All 3500 series modules, 136711-01 cables, 140734-01 gateways |
| Certification | UL, CE, RoHS compliant, IEC 61010-1 approved |
BENTLY 3500/20 125744-02
Product introduction
The 3500/20 125744-02 from Bently Nevada is the foundational rack assembly that forms the physical and electrical backbone of 3500 Machinery Protection Systems. This 10-slot rack provides the structural framework and high-speed backplane connectivity required to integrate all system components into a unified protection solution. Bently Nevada’s 3500/20 125744-02 serves as the central hub where monitoring modules, communication gateways like the 140734-01, power supplies, and interface devices connect, enabling seamless data exchange and power distribution throughout the protection system.
Bently Nevada’s 3500/20 125744-02 addresses the critical need for a robust, scalable platform in machinery protection applications. Its engineered backplane ensures reliable communication between connected modules, while its flexible slot configuration accommodates various system layouts—from simple single-machine monitoring to complex multi-point protection systems. By providing a standardized mounting and connectivity solution, the 3500/20 125744-02 simplifies system integration, expansion, and maintenance, serving as the essential foundation for reliable machinery health monitoring across industries.
Core advantages and technical highlights
Integrated system architecture: The 3500/20 125744-02 features a high-performance backplane that distributes both power and data between connected modules at speeds necessary for real-time protection. This integrated architecture eliminates the need for external wiring between modules, reducing installation complexity while ensuring synchronized operation between components like 140734-01 communication gateways and monitoring modules.
Redundant power distribution: Designed with dual power input connections, the 3500/20 125744-02 supports redundant 3500/22M power supplies. This redundancy ensures uninterrupted operation even if one power source fails, with automatic failover that maintains power to all connected modules—critical for safety-critical protection systems where downtime could lead to machinery damage.
Flexible scalability: With 10 slots accommodating both 1-slot and 2-slot modules, the 3500/20 125744-02 provides exceptional flexibility for system expansion. Users can start with basic protection configurations and easily add modules as monitoring requirements grow, without needing to replace the entire rack assembly. This scalability makes it ideal for both initial installations and future system upgrades.
Robust industrial design: Constructed with a powder-coated aluminum frame and reinforced mounting brackets, the 3500/20 125744-02 withstands the mechanical stress and environmental conditions of industrial environments. Its optimized convection cooling design maintains proper operating temperatures without fans, reducing maintenance requirements and eliminating potential points of failure in critical applications.
Typical application scenarios
In power generation turbine protection systems, the 3500/20 125744-02 serves as the central platform integrating all monitoring components. It houses vibration monitors connected to sensors via 136711-01 cables, 140734-01 communication gateways, power supplies, and display modules in a single, organized assembly. Installed in turbine control cabinets, the rack provides a compact, integrated solution that simplifies wiring and maintenance while ensuring reliable communication between protection system components.
Oil and gas processing facilities utilize the 3500/20 125744-02 in compressor train protection systems, where its redundant power capability ensures continuous operation in remote locations. The rack integrates temperature monitors, vibration modules, and communication gateways, providing a centralized platform for monitoring multiple compressor stages. Its robust construction withstands the vibration and temperature fluctuations common in compressor stations, ensuring system reliability in harsh conditions.
Manufacturing plants deploy the 3500/20 125744-02 to centralize protection systems for production line machinery. The rack accommodates mixed configurations of monitoring modules, relay outputs, and communication devices, providing a standardized platform that simplifies integration with plant-wide automation systems. Its flexible mounting options allow installation in control rooms or near machinery, with the backplane ensuring reliable data transmission between modules regardless of location.
BENTLY 3500/20 125744-02
Related model recommendations
136711-01: Vibration sensor cable connecting field devices to modules within the 3500/20 125744-02.
140734-01: Communication gateway that installs in 3500/20 125744-02 slots for data distribution.
3500/22M: Power supply module that connects to 3500/20 125744-02 for redundant power distribution.
3500/42M: Vibration monitor module designed for installation in 3500/20 125744-02 slots.
3500/60 163179-01: Display module that occupies 2 slots in the 3500/20 125744-02 rack.
3500/15: Relay output module that mounts in 3500/20 125744-02 for protection actuation.
125744-01: 8-slot variant of the 3500/20 rack for smaller system configurations.
Installation, commissioning and maintenance instructions
Installation preparation: Before installing the 3500/20 125744-02, verify the mounting location provides adequate space, ventilation, and environmental protection. Ensure the surface can support the rack’s weight (including modules). Gather required tools including mounting hardware, torque wrench, and level. Inspect the rack for shipping damage, particularly checking the backplane connectors and mounting brackets. Plan module layout in advance to optimize heat distribution and cable routing for connected sensors like those using 136711-01 cables.
Maintenance suggestions: Include the 3500/20 125744-02 in quarterly system inspections, checking for loose connections, corrosion, or debris accumulation. Verify all module retaining screws are properly torqued. Inspect backplane connectors for contamination during module replacements and clean with approved electronic contact cleaner if needed. Ensure ventilation paths remain unobstructed to maintain proper cooling. During major maintenance, verify power distribution integrity across all slots using a multimeter. Tighten mounting hardware annually to prevent vibration-induced loosening in industrial environments.
Service and guarantee commitment
Bently Nevada provides the 3500/20 125744-02 with a 36-month warranty covering manufacturing defects and structural integrity issues under normal operating conditions. Our technical support team offers expert guidance on rack layout optimization, installation procedures, and integration with modules like the 140734-01 and cables such as the 136711-01.
We offer application engineering assistance to help design optimal system configurations based on specific monitoring requirements. Beyond the warranty period, our service agreements include inspection services, technical support, and replacement parts to ensure long-term reliability. Bently Nevada’s commitment to quality ensures the 3500/20 125744-02 provides a durable, reliable platform for machinery protection systems throughout its operational lifecycle, backed by our global service network.
