The overspeed detection I/O module is designed for high-reliability rotational speed protection. It receives speed sensor signals, performs real-time overspeed detection, and triggers alarms or emergency shutdowns when preset thresholds are exceeded.
The module supports redundant voting logic, including 2oo2 and 2oo3 (recommended) configurations, significantly improving system safety and fault tolerance.

Sensor Compatibility
Fully compatible with a wide range of speed and displacement sensors, including:

3300 series eddy current sensors

High-temperature eddy current sensors

RAM eddy current sensors

Magneto-electric (magnetic pickup) sensors

Electrical Characteristics

Input signal range: +10.0 V to −24.0 V
(Signals outside this range are internally limited by the module)

Power supply: 24 VDC (±10%)

Sensor power output: −24 VDC, 40 mA

Environmental Specifications

Operating temperature: −30 °C to +65 °C

Relative humidity: 5% to 95% (non-condensing)

Physical Characteristics

Weight: approximately 0.45 kg

Country of origin: United States

Application Scenarios
This module is widely used in overspeed safety protection systems for rotating machinery such as:

Steam turbines

Compressors

Generators

It is commonly deployed in industries including power generation, petrochemical, and chemical processing. When combined with other 3500 series modules, it forms a highly reliable mechanical protection system, effectively preventing equipment damage and safety incidents caused by overspeed conditions.

Bently Nevada 3500/53 133396-01｜Overspeed Detection I/O Module｜