Bently Nevada 3701/55 Emergency Shutdown Device (ESD)

FAQ

Q1: What is Bently Nevada 3701/55?
A: The 3701/55 is the ADAPT Emergency Shutdown Device (ESD), a safety PLC with integrated overspeed detection for protecting critical rotating machinery.

Q2: What is the main function of the 3701/55?
A: Its primary function is to detect dangerous operating conditions, particularly overspeed conditions, and execute the programmed shutdown logic to protect the machine.

Q3: What type of architecture does the 3701/55 use?
A: It uses a triple-modular-redundant (TMR) architecture with three CPU modules, providing high availability and fault tolerance for safety-critical applications.

Q4: How many inputs and outputs does the system support?
A: The system supports 6 speed inputs, 32 discrete inputs and 12 analog inputs, together with 12 independent trip relay outputs and two internally powered 4–20 mA recorder outputs.

Q5: How fast can the 3701/55 respond to a trip condition?
A: The nominal logic processing time is approximately 2 ms, while the relay state-change time is approximately 8 ms. This fast response is particularly important for overspeed protection.

Q6: What communication protocol does the 3701/55 use?
A: The system uses Ethernet with TCP/IP, and integration with plant controls, HMI or other automation systems can be performed through Modbus TCP. It provides six physical Ethernet interfaces.

Q7: What are the dimensions and weight of the 3701/55?
A: The published overall dimensions for the 3701/55 ESD are approximately 293 × 254 mm (11.5 × 10 in.). A practical shipping reference is approximately 5–8 kg, although the actual weight depends on the installed configuration.

Q8: Where is the 3701/55 commonly used?
A: It is designed for critical rotating equipment such as steam turbines, gas turbines, hydro turbines, expanders and other process machinery where independent overspeed protection and emergency shutdown are required.

3701/55 Bently Nevada

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