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Help CenterBentley Nevada 3500/53 Overspeed Detection Module
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Bentley Nevada 3500/53 overspeed detection module
I. Core Functions
The 3500/53 is a dedicated overspeed detection module in the Bently Nevada 3500 series mechanical monitoring and
protection system. It achieves overspeed protection for equipment by collecting rotational speed signals and is widely
used in rotating machinery such as steam turbines, compressors, and generators. Its core functions include:
Real-time overspeed monitoring: Continuously collect rotational speed pulse signals and compare them with the
preset threshold. When the alarm value is exceeded, a protection action is triggered.
Voting system integration: Supports 2-in-2 or 3-in-2 redundant configuration (3-in-2 voting system is recommended),
enhances reliability through multi-channel cross-validation, and avoids single-point failure misoperation.
Rapid response mechanism: When the rotational speed exceeds the set value, the alarm delay time is less than 30ms
(when the frequency is greater than 300Hz), ensuring the safe shutdown of the equipment.
Ii. Technical Principles and Signal Processing
Input signal type
Support pulse signals for approaching eddy current sensors (such as Bentley 3300 8mm/16mm series), magnetoelectric
sensors or tachometer switches.
Signal range: +10.0V to -24.0V (automatic limiting beyond the range), input impedance 20kΩ, compatible with
industrial standard sensors.
Processing logic
Threshold setting: The Alarm and Danger thresholds can be set through the 3500 framework configuration software,
which are usually adjustable within the 0-100% full scale range (for example, when the full scale is 10,000 RPM, the
threshold can be set to 110%, that is, 11,000 RPM).
Signal filtering: Built-in digital filtering algorithm to suppress false pulses caused by mechanical vibration or
electromagnetic interference, ensuring the accuracy of rotational speed calculation.
Voting mechanism (3 choose 2 system) : Three independent modules simultaneously collect signals. When any two
modules detect overspeed, they output a stop signal to reduce the false alarm rate.
Iii. Hardware Characteristics and System Integration
Module hardware parameters
Power consumption: Typical value 8.0W, compatible with 3500 frame power supply systems.
Status indication: The front panel LED light shows the operating status (OK), communication status (TX/RX), and
alarm/hazard output, facilitating on-site fault diagnosis.
Output interface: Each channel provides relay output (alarm and hazard), which can be directly connected to the
equipment shutdown circuit. At the same time, it supports 4-20mA analog output to the DCS system.
System composition example (3-choice 2 voting System)
Hardware configuration: 3500 framework + power module + Framework interface module (FIM) + three 3500/53
modules + independent sensor circuit.
Redundancy advantage: When any module or sensor fails, the system still maintains the protection function through
the remaining channels, meeting the SIL safety integrity level requirements.
Iv. Application Scenarios
Turbine overspeed protection
In the steam turbine of a thermal power plant, the 3500/53 module calculates the rotational speed in real time by
collecting the gear disk tooth signal of the main shaft (such as 60 pulses per revolution). When the turbine speed
exceeds the rated value by 110%, the module drives the emergency shutdown solenoid valve to cut off the steam
intake and prevent the rotor from breaking due to overspeed.
Compressor anti-surge protection
When centrifugal compressors in the petrochemical industry are in operation, if the rotational speed gets out of
control,it may cause surging. The 3500/53 is linked with the vibration and displacement monitoring module. When the
rotational speed is abnormal and the vibration exceeds the standard, it triggers the interlocking shutdown to protect
the compressor impeller and bearings.
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