Overview
Manuals
Principle
Key Applications
Features:
- Overspeed Detection I/O Module
- 3500/53 Electronic Overspeed Detection System
- Provides a highly reliable, fast response, redundant tachometer system
Bently Nevada Electronic Overspeed Detection System for the 3500 Series. The mechanical detection system provides a highly reliable, fast-response redundant tachometer system designed specifically for use as part of an overspeed protection system. This system complies with American Petroleum Institute (API) Standards 670 and 612 regarding overspeed protection requirements.
The primary function of this module is to continuously monitor the shaft speed and compare it to a user-defined setpoint. If overspeed is detected, the module triggers its integrated physical relays, initiating an emergency stop (trip). To prevent false trips and ensure maximum safety, the module is typically configured with a 2003 (3-to-2) voting logic and installed in a 3500 rack, ensuring that a single sensor failure does not lead to a plant-wide shutdown while still providing critical protection compliant with SIL 2 or SIL 3 safety standards.
The 133396-01 Bently Nevada Overspeed Detection I/O Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 133396-01 Overspeed Detection I/O Module Manuals(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
The module converts these input pulses into precise digital speed values in real time and performs internal logic calculations at extremely high speeds, ensuring a response time typically below 50 milliseconds. When the calculated speed exceeds a preset trip limit, the module disconnects power to its internal relays, which are directly connected to the machine's emergency trip circuit, immediately cutting off the fuel or steam supply.
Overspeed Protection: Its primary function is continuous monitoring of the speed of large machinery such as steam turbines, gas turbines, and centrifugal compressors.
Safety System Compliance: Designed to meet the stringent overspeed protection requirements of API 670 and 612 standards.
Redundant Voting System: Multiple modules can be coupled to form a highly reliable 2/2 or 2/3 voting configuration. This prevents false tripping while ensuring the machine can stop in the event of a genuine overspeed incident.
Emergency Stop (ESD) Interface: Features an integrated SPDT relay output for direct connection to external alarm circuits or emergency stop systems.
Data Logging: Provides a +4 to +20 mA logging output proportional to the measured speed for external monitoring or historical data logging.
