The Bently Nevada 3500/54M is a dual-channel electronic overspeed detection module for the 3500 Machinery Protection System. It is designed for accurate speed monitoring and overspeed protection of critical rotating machinery.
The module complies with API 670 requirements and is suitable for key equipment such as steam turbines, gas turbines, and compressors. By rapidly detecting overspeed conditions and initiating safety interlocks, the 3500/54M helps ensure safe and reliable unit operation.

Core Positioning and Key Characteristics

Dual-Channel Speed Monitoring
Each 3500/54M module supports two independent speed input channels, compatible with 3300 XL eddy current sensors or magneto-electric speed sensors. The module accurately measures shaft speed and supports analysis of speed variation and fluctuation.

Measurement and Protection Capability

Speed measurement range: 0.1 to 100,000 rpm

Supports multi-level overspeed setpoints (e.g. 105%, 110% of rated speed)

Configurable alarm and shutdown thresholds with time delay

Includes sensor failure detection, continuous self-diagnostics, and fault alarms to ensure high monitoring reliability

Outputs and Communication
Provides dry-contact relay outputs for alarm and shutdown functions (two independent output sets). Supports Modbus, PROFIBUS, and 4–20 mA analog outputs, allowing direct connection to ESD, DCS, and PLC systems. Remote configuration, monitoring, and diagnostics are supported via the 3500/40 HMI or System 1 software.

Safety and Environmental Specifications
Designed to meet SIL 2 safety requirements. Operating temperature range is –40 °C to +70 °C, making the module suitable for hazardous and non-hazardous areas and compliant with harsh industrial environment conditions.

Bently Nevada 3500/54M｜Overspeed Detection Module｜