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Bently Nevada 3500/53｜Overspeed Detection I/O Module｜
Overspeed Protection
Provides real-time rotational speed monitoring. Measured speed is continuously compared against user-defined thresholds, triggering alarms and protection actions when limits are exceeded to prevent equipment damage.
Redundant Voting Logic
Supports 2oo2 and 2oo3 (recommended) voting configurations using multiple modules, significantly reducing the risk of false trips and improving overall system reliability.
Multi-Sensor Compatibility
Compatible with eddy current proximity probes and magnetic pickup (magneto-electric) sensors, meeting diverse speed measurement requirements for different types of rotating machinery.
Programmable Alarms and Protection Outputs
Supports multi-level alarm setpoints. Dedicated relay outputs provide fast and reliable protection response for shutdown or interlock systems.
Fault Diagnosis and Status Indication
Integrated LED indicators display module operation, communication status, and bypass state, enabling quick identification of hardware or sensor faults.
Communication and System Integration
Supports Modbus communication, compatible with Ethernet TCP/IP, and enables data upload to SCADA systems and System 1 software for centralized monitoring and analysis.
Measurement Range and Frequency Response
Speed range: 1 to 99,999 rpm
Maximum input frequency: 20 kHz
Minimum detectable frequency:
Eddy current sensor: 0.0167 Hz (1 rpm)
Magnetic pickup sensor: 3.3 Hz
Measurement Accuracy
＜ 100 rpm: ±0.1 rpm
100 to 10,000 rpm: ±1 rpm
10,000 to 99,999 rpm: ±0.01% FS
Ensures high accuracy and reliable overspeed decision-making across the full operating range.
Input Signal Characteristics
Signal range: +10 V to −24 V
Input impedance: 20 kΩ
Compatible with 3300 XL and 7200 series sensors
Shielded cabling with single-ended grounding for enhanced noise immunity
Output Interfaces
Analog output: 4–20 mA per channel
Buffered sensor outputs
Two independent alarm relay outputs per module for direct protection action
Fully compatible with PLC and DCS systems
Power Supply
Powered from the 3500 frame backplane, operating at 18–30 VDC. Typical power consumption is 8 W. Redundant power supply architecture enhances system availability and reliability.
Bently Nevada 3500/53｜Overspeed Detection I/O Module｜
By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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