Bently Nevada 3500/53 133388-01 | Overspeed Detection Module

Description

The Bently Nevada 3500/53 133388-01 is an electronic overspeed detection module in the 3500 series mechanical monitoring system. It is suitable for scenarios where high-precision rotational speed monitoring and overspeed protection of rotating equipment are required, such as large turbines, compressors, pumps and other equipment in industries like petrochemical, power, and metallurgy. By monitoring the equipment's rotational speed in real-time, when the speed exceeds the set threshold, it will promptly send out an alarm signal and take corresponding protective measures to ensure the safe and stable operation of the equipment and prevent equipment damage and safety accidents caused by overspeed.

Features: High Reliability: It provides a highly reliable and fast-responsive redundant tachometer system for the mechanical monitoring system, specifically designed for the overspeed protection system, and complies with the requirements for overspeed protection in American Petroleum Institute (API) standards 670 and 612. Combinability: The module can be combined to form a 2-out-of-2 or 2-out-of-3 (recommended) voting system, enhancing the accuracy and reliability of overspeed detection. Requires Redundant Power Supply: The overspeed detection system needs to use a 3500 rack equipped with a redundant power supply to ensure normal operation even when the power supply fails, further improving the stability and reliability of the system.

Main Functions: Rotational Speed Detection and Locking: It has the function of rotational speed detection, which can accurately monitor the operating speed of the equipment and can achieve peak rotational speed locking, helping to analyze the speed changes of the equipment under different working conditions. Combined Alarm Function: It can be set for 2-channel or 3-channel combined alarm. Through various channel combination methods, it can flexibly monitor and alarm for overspeed situations, improving the accuracy and reliability of the alarm and reducing the possibility of false alarms and missed alarms. Overspeed and Low-speed Detection: It can not only detect the overspeed status but also monitor the low-speed situation. Corresponding thresholds can be set. When the equipment's rotational speed is lower than or higher than the set value, it will promptly send out an alarm signal to ensure that the equipment operates within the normal rotational speed range. Online Testing Function: It supports online internal testing. The function of the module can be checked and verified without shutting down the machine, which is convenient for maintenance personnel to promptly understand the working status of the module, ensure its reliable performance, and reduce equipment maintenance time and costs. Technical Parameters: Input Impedance: 20kΩ. Power Consumption: The typical value is 8.0 watts. Output Impedance: 550Ω. Relay Type: Single Pole Double Throw (SPDT) relay. Dimensions: 9.50 inches × 0.96 inches × 9.52 inches. Weight: 0.82 kilograms.

Common Faults and Solutions: 1. Inaccurate Rotational Speed Measurement Fault Phenomenon: The displayed rotational speed of the equipment does not match the actual speed, which may lead to false overspeed alarms or failure to detect the real overspeed situation in a timely manner. Possible Causes: Sensor failure (such as probe damage, broken connection cable or poor contact), inaccurate sensor installation position, incorrect module input parameter settings, etc. Solutions: First, check the appearance of the sensor to see if there are signs of damage. If so, replace the sensor; check the connection cable to ensure it is firmly connected and replace the cable if necessary; recalibrate the installation position of the sensor to make it meet the equipment requirements; check the input parameter settings of the module, such as sensor type, range, etc., to ensure the settings are correct. 2. Relay Fault Fault Phenomenon: When the set overspeed value is reached, the relay does not act, and it is unable to send out an alarm signal or trigger a protective action; or the relay malfunctions frequently. Possible Causes: Damage to the relay itself, failure of the relay drive circuit, internal logic errors of the module, etc. Solutions: Use tools such as a multimeter to check the working status of the relay. If the relay is damaged, replace it with a new one; check the relay drive circuit to see if there are any damaged components or loose soldering points, and repair or replace the damaged components; reset the module or reload the correct configuration program to solve possible internal logic errors.

3. Communication Abnormality Fault Phenomenon: The module cannot communicate normally with the host computer or other devices, resulting in the inability to transmit rotational speed data or receive control commands. Possible Causes: Damage to the communication interface, communication cable failure, incorrect communication parameter settings (such as baud rate, data format, etc.). Solutions: Check the communication interface to see if there is any physical damage. If so, repair or replace it; check the connection of the communication cable to ensure it is correctly connected and there is no damage, and replace the cable if necessary; verify the communication parameter settings to ensure they are consistent with those of the connected device. 4. Abnormal Module Indicator Lights Fault Phenomenon: The indicator lights on the module display abnormally, such as not lighting up, staying on constantly, or flashing abnormally, and cannot accurately reflect the working status of the module. Possible Causes: Internal power supply failure of the module, hardware failure (such as damage to components on the circuit board), software failure, etc. Solutions: Check the power input of the module to ensure the voltage is normal and stable; if a hardware failure is suspected, conduct a visual inspection of the circuit board to see if there are any signs of components being burned out or short-circuited. If necessary, contact professional maintenance personnel for inspection and repair; for software failures, try to upgrade the software of the module or restore the default settings. 5. Failure of the Combined Alarm Function Fault Phenomenon: When a 2-channel or 3-channel combined alarm is set, the module does not send out an alarm signal as expected when the alarm conditions are met. Possible Causes: Incorrect combined alarm settings, failures of related channels, internal logic errors of the module, etc. Solutions: Recheck the setting parameters of the combined alarm to ensure the settings are correct; check the working status of the related channels, such as whether the sensor input is normal and whether the channel connection is good; conduct a fault diagnosis on the module to check for any internal logic problems, and update the software or repair the hardware if necessary.

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