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SPECIFICATIONS:
Part Number: 133388-01
Manufacturer: Bently Nevada
Series: 3500/53
Product Type: Electronic Overspeed Detection System
Input Signals: +10.0 V
Sensitivity: 100 mV/mil (4 V/mm)
Power Consumption: 7.7 Watts
Signal Conditioning Accuracy: �1% maximum
Output Impedance: 550 Ohm
Input Impedance: 20 k Ohm
Transducer Power Supply: -24 Vdc
Voltage Compliance (current output): 0 to +12 Vdc
Max switched power: dc: 120 W
Frequency Response: +25 �C
Operating Temperature: -30 �C to +65 �C
Power Supply Voltage: 125 V dc
Technology: Surface Mount
Dimensions: 241.3 mm x 24.4 mm x 99.1 mm
Repair: 3-7 Day
Availability: In Stock
Weight: 0.82 kg
Country of Origin: United States
FUNCTIONAL DESCRIPTION:
135313-01 is an Electronic Overspeed Detection System manufactured and designed by Bently Nevada as part of the 3500/53 Series used to control the machinery condition monitoring system. The system typically consists of speed sensors, a control unit, and output relays. Speed sensors, such as magnetic pickups or proximity probes, are mounted near the rotating shaft or gear teeth to continuously measure speed. These sensors generate electrical pulses proportional to the rotational speed of the machine. The pulses are then transmitted to the control unit, which processes the signals and compares them to predefined overspeed thresholds. Modern overspeed detection systems often incorporate Triple Modular Redundancy (TMR), where three independent channels measure and verify speed values to ensure high reliability and minimize false trips.
When the control unit detects that the speed has exceeded the preset limit, it sends a command to activate output relays. These relays are connected to Emergency Shutdown (ESD) systems, circuit breakers, or fuel control valves, which immediately cut power or fuel supply to the machine, bringing it to a safe stop. In advanced systems, the overspeed detection system can also communicate with Supervisory Control and Data Acquisition (SCADA) systems or Distributed Control Systems (DCS) for real-time monitoring and logging of speed data.
OVERSPEED PROTECTION MECHANISM:
The overspeed protection mechanism in the 3500/53 module is based on user-defined alarm and trip setpoints. When the system detects that the speed has exceeded the alarm setpoint, it generates an overspeed warning, notifying operators of a potential issue. If the speed continues to increase beyond the trip setpoint, the system immediately activates the trip relay output, sending a signal to the emergency shutdown (ESD) system or control system to stop the machine. The trip response time is typically less than 10 milliseconds, ensuring that the equipment is quickly protected from potential catastrophic failure due to excessive rotational speeds.
The relay outputs of the 3500/53 module provide direct interface capability with DCS, SCADA, or PLC systems, allowing seamless integration into plant-wide control and monitoring networks. The module supports both normally open (NO) and normally closed (NC) relay contacts, ensuring flexibility in different system configurations. It also includes a self-checking diagnostic system, which continuously monitors the module’s internal circuits and alerts operators in case of a fault, further improving reliability.
For communication and data integration, the 3500/53 module is compatible with Bently Nevada System 1 software and can transmit real-time speed data, alarm conditions, and trip events via Modbus TCP/IP or Ethernet. The system is typically housed within a 3500-series rack, which also includes other monitoring modules for vibration, temperature, and process variables. Additionally, the module requires a 3500/22 Transient Data Interface (TDI) for advanced diagnostics and data logging, which enables remote monitoring and analysis of historical speed trends.
WOC maintains the Largest Inventory of Replacement Parts for Bently Nevada Monitoring systems. Additionally, we offer warranty-backed unused and rebuilt boards and board repairs for damaged ones. Our team of professionals is available around the clock for your OEM needs. We at WOC are happy to help you with any automation needs you may have. Please contact our team by phone or email for pricing and availability on any components and repairs.
What is the Bently Nevada 3500/53 Overspeed Detection System?
The Bently Nevada 3500/53 Overspeed Detection System is a highly reliable and advanced monitoring solution designed to detect and prevent excessive rotational speeds in critical rotating machinery. It is part of the Bently Nevada 3500 Series Machinery Protection System and is primarily used in turbines, compressors, and generators.
Why is Triple Modular Redundancy (TMR) important in overspeed detection?
TMR enhances system reliability by using three independent speed channels, ensuring that a single sensor failure does not trigger false trips or system malfunctions. The system makes a decision based on a 2-out-of-3 voting mechanism, allowing operations to continue even if one sensor fails.
What types of speed sensors are compatible with the 3500/53?
The system supports various sensor types, including proximity probes, magnetic pickups, and Hall-effect sensors. This flexibility allows it to be integrated with different machinery setups, ensuring accurate speed measurements across a range of industrial applications.
