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3300 25

3300/25 - Dual Accelerometer Monitor

3300/25 - Dual Accelerometer Monitor 3300/25 - Dual Accelerometer Monitor

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SPECIFICATIONS

Part No.: 3300/25
Manufacturer: Bently Nevada
Product Type: Dual Accelerometer Monitor
Availability: In Stock
Temperature of operation: 0 to +65 degrees Celsius
Storage Temperature: -40 to +85 degrees Celsius
Weight: 1 Kg
Relative Humidity: To 95%, noncondensing.
Series: 3300 Series
Country of Manufacture: United States (USA)

Functional Description

3300/25 is a Dual Accelerometer Monitor developed by Bently Nevada. It is a part of 3300 Bently Nevada Series. The Dual Accelerometer Monitor measures absolute machine housing or structural vibration relative to free space (seismic) and offers two independent channels of on-line machine vibration monitoring with zero-topeak signal conditioning and display capabilities. This Monitor has over 10,000 different high-pass and low-pass filter combinations. By using plug-in jumpers, these filter combinations can be easily changed in the field.

3300/25 Features

  • The System presents a range of features designed to offer comprehensive and precise machinery monitoring, particularly for equipment featuring fluid film bearings. This system addresses the unique requirements of such machinery and employs advanced technologies for accurate vibration analysis and protection.
  • For machinery equipped with fluid film bearings, the 3300/25 Monitoring System prioritizes the measurement of shaft relative vibration as the primary parameter. This measurement is facilitated through the use of a probe and Proximitor, which together provide a reliable and sensitive means of assessing the machinery's operational condition. By focusing on shaft relative vibration, the system can detect deviations from normal behavior and enable timely intervention to prevent potential issues.
  • In cases where specific machinery with fluid film bearings produces vibrations that are either inadequately detected by shaft relative displacement or sufficiently transferred to the bearing housing, the system introduces the option of utilizing accelerometer measurements as a supplementary approach. This flexibility ensures that even in complex scenarios, the system can adapt to the machinery's vibration characteristics and provide accurate insights into its performance.
  • When considering housing measurements for overall machine protection, the practicality and relevance of such measurements are emphasized. While housing measurements can offer valuable information, their usefulness should be evaluated on a case-by-case basis. The majority of mechanical faults, such as imbalance or misalignment, originate in the rotor and result in increased rotor vibration. For housing measurements to be effective in overall machine protection, they must faithfully transmit a significant portion of rotor vibration to the bearing housing or machine casing. This transmission ensures that the measurement accurately reflects the machine's condition.
  • However, the proper physical installation of the transducer is of utmost importance. Careful installation practices are crucial to maintaining the integrity of the measurement process. Incorrect installation can lead to reduced transducer amplitude and frequency response, as well as the generation of signals that do not accurately represent actual machine vibration. By highlighting the importance of proper installation, the system underscores the significance of accurate data collection and analysis.

Input

  • The input configuration of the Monitoring System is engineered to seamlessly integrate with a variety of acceleration transducer signals, delivering precise and dependable monitoring capabilities. This adaptable input system caters to the unique requirements of machinery analysis and provides accurate insights into operational conditions.
  • The system readily accepts one or two acceleration transducer signals, which can originate from multiple sources, including Bently Nevada's standard Acceleration Interface Module 23733-03, the High Frequency Interface Module 24145-02, or the 330400 Accelerometer Transducer. This flexibility enables the system to accommodate a diverse range of machinery setups, making it compatible with various transducer models and configurations.
  • One of the key attributes of the acceleration transducer signals is their sensitivity, which is set at 100 mV/g (10 mV per m/s�). This level of sensitivity enables the system to capture even the slightest vibrations generated by the machinery. By being attuned to minute changes in acceleration, the system can effectively detect early indicators of mechanical abnormalities and deviations from normal operation. This capability is instrumental in preventing major malfunctions and optimizing maintenance strategies.
  • The power consumption aspect of the input system is designed with efficiency in mind. The system exhibits a nominal power consumption of 3 watts, excluding the power consumed by the accelerometers themselves. This energy-efficient design contributes to the overall effectiveness of the monitoring system while minimizing its impact on power resources. This efficiency is especially important in industrial settings where energy conservation and operational cost management are priorities.

LED indicators

  • OK: One constant ON green LED per channel indicates that the monitor, transducers, and field wiring are in good working order. Constant OFF indicates a NOT OK condition or that the channel has been bypassed (red Bypass LED will be ON). OK If Timed OK/Channel Defeat is programmed, an LED flashing at 1 Hz indicates that the channel was NOT OK but is now OK. OK An LED flashing at 5 Hz indicates that an error code (or codes) has been stored in memory.
  • Alarm: Alarm status is indicated by two red LEDs per channel (individually for Alert and Danger). First Out is indicated by a flashing alarm LED (independent for Alert and Danger).
  • Bypass: The status of the Danger Bypass and Rack/Channel Bypass functions is indicated by two red LEDs (individually per channel). When the monitor is in Trip Multiply mode, the LEDs flash.

Product Attributes

  • It is distinguished by a set of product attributes that emphasize its versatility, precision, and adaptability to a wide array of machinery monitoring scenarios.
  • One of the notable product attributes is its provision of absolute machine housing dimensions. This feature underscores the system's commitment to accommodating a variety of machinery types and sizes. By offering absolute machine housing dimensions, the system caters to diverse industrial applications, ensuring that it can be seamlessly integrated into different equipment configurations. This flexibility streamlines the installation process and eliminates the need for extensive modifications, enhancing the overall efficiency of implementing the monitoring system.
  • The system further stands out with its provision of two independent channels. This dual-channel capability allows the system to simultaneously monitor two distinct aspects of the machinery's vibration behavior. This comprehensive approach to monitoring enables operators to gain a more holistic view of machinery health by capturing data from multiple points or components. Such a multi-channel setup is particularly beneficial for identifying complex vibration patterns and potential issues that might be missed with a single-channel configuration.
  • An impressive feature of the Monitoring System is its ability to offer over 10,000 high-pass and low-pass filter combinations. Filters play a crucial role in signal processing, allowing operators to focus on specific frequency ranges of interest while reducing noise and interference. With such a vast array of filter combinations, the system provides unparalleled customization options. This level of flexibility empowers operators to fine-tune the system's sensitivity and responsiveness according to the machinery's unique vibration characteristics. By tailoring the filter settings, operators can effectively isolate and analyze specific vibration frequencies, enhancing the accuracy of their diagnostics and maintenance decisions.

OK Relay

  • The System OK Relay is affixed to the Power Input Module. To activate the OK Relay, it is imperative that every channel within the rack is either in an "OK" state or bypassed.

Alarm Functionality

  • Pressing either the ALERT or DANGER switches on the monitor front panel initiates the display of corresponding Alert (first level alarm) or Danger (second level alarm) setpoints on the front panel meter.
  • The ALERT and DANGER LEDs illuminate when the signal level surpasses preset thresholds for the selected time delay. Subsequently, the relevant Alert and Danger relay contacts are activated. The activation conditions for Danger relay contacts are determined by AND and OR voting logic options.

First Out Alarms

  • Separate First Out circuits are dedicated to Alert and Danger alarms. A monitor equipped with the First Out option will flash a channel alarm LED if that channel is the first to enter the alarm state since the last rack power-up or reset. Acknowledging the First Out is done by pressing the RESET switch on the System Monitor, which transitions the flashing LED to a steady state.

Danger Bypass

  • During maintenance, the Danger Bypass switch on the monitor circuit board can be employed to inhibit the Danger relay drive, accompanied by the activation of the BYPASS LEDs. This function does not affect other front panel functions and can be enabled by installing a jumper on the monitor circuit board.

Configurable Alarm Relays

  • Monitor alarms can be programmed to operate in either latching or nonlatching mode. In the nonlatching mode, alarms reset automatically when the alarm condition no longer exists.
  • Conversely, the latching mode necessitates manual reset through the front panel RESET switch on the System Monitor or external Reset contacts, and it will not reset if the alarm condition persists.

Buffered Output

  • The monitor provides buffered signals from transducers via channel A and B coaxial cable connectors on the front panel and through terminals on the Signal Input Relay Module. These connectors facilitate connections to external equipment.
  • The buffered output signal is presented in the same units as the LCD display for the respective channel. For instance, if a channel displays velocity units, the corresponding buffered output will be in velocity units. It is also possible to configure the buffered output to transmit filtered or unfiltered signals, except for channels displaying velocity with filters before the integrator/gain stage.

Recorder Output

  • For each channel, the monitor offers a recorder output. This output is proportional to the measured acceleration or vibration signal across the full-scale range of the monitor. Users can select the output range to be 0 to -10 Vdc, +1 to +5 Vdc, or +4 to +20 mA.

Optimizing Monitor System Performance with High-Pass and Low-Pass Filter Combinations

  • Selecting appropriate filter combinations for high-pass and low-pass filters is crucial in achieving optimal performance within monitor systems. However, it's essential to note that not all filter combinations are compatible. Therefore, a combination of solid engineering judgment and comprehensive understanding of machine dynamics and transducer characteristics is necessary to make informed filter selections.
  • When dealing with accelerometer applications, employing a low-pass filter is often recommended to counteract the impact of the transducer's mounted resonance. The utilization of a low-pass filter serves the purpose of filtering out high-frequency signals beyond a specified cutoff frequency, thereby minimizing the influence of resonance and preventing potential inaccuracies in the data obtained from the transducer.
  • In certain scenarios, the presence of undesirable low-frequency noise can pose challenges. In such cases, incorporating a high-pass filter might be necessary. This high-pass filter effectively attenuates signals below a set frequency threshold, helping to mitigate the effects of unwanted low-frequency noise that could otherwise interfere with the accuracy of the measurements. This becomes particularly advantageous in integrated acceleration (or velocity) channels, where a high-pass filter aids in reducing the impact of high gain at low frequencies, often stemming from electronic integration processes.
  • Moreover, the integration of a high-pass filter serves to counteract potential issues arising from amplified signals at lower frequencies, which can be a consequence of electronic integration procedures. By implementing a high-pass filter, the adverse effects caused by this amplified low-frequency signal gain can be minimized or eliminated, leading to more accurate and reliable measurements, especially in situations where integrated acceleration or velocity channels are utilized.
  • The selection of appropriate filter options�specifically, employing low-pass filters to address transducer resonance effects and utilizing high-pass filters to combat unwanted low-frequency noise and mitigate high gain at low frequencies caused by electronic integration�requires a comprehensive understanding of the machine's dynamics and transducer characteristics. This strategic combination of filter types contributes significantly to ensuring precise and reliable data acquisition and interpretation within monitor systems.

World of Controls has the most comprehensive collection of Bently Nevada products. Please contact WOC as soon as possible if you require any extra information.

Frequently Asked Questions

What is 3300/25?
It is a Dual Accelerometer Monitor developed by Bently Nevada

How many channels of on-line machine vibration monitoring does Monitor provide?
It provides two independent channels of on-line machine vibration monitoring.

What is the primary measurement that should be used for virtually all machinery with fluid film bearings?
The primary measurement that should be used for virtually all machinery with fluid film bearings is shaft relative vibration, using a probe and Proximitor.

What can accelerometer measurements be used for in particular machinery with fluid film bearings?
Accelerometer measurements can be used to supplement shaft relative measurements in particular machinery with fluid film bearings, where vibrations are not adequately detected by shaft relative displacement and these vibrations are transmitted sufficiently to the bearing housing.

What do the green LEDs indicate on the module?
Each channel on the monitor has a constant ON green LED that signals the good working condition of the monitor, transducers, and field wiring. If the green LED is OFF, it suggests a NOT OK condition or the channel might have been bypassed (indicated by the red Bypass LED).

What does an LED flashing at 5 Hz mean?
An LED flashing at 5 Hz indicates that one or more error codes have been stored in the memory of the monitor. This flashing serves as a diagnostic alert, highlighting the need for attention to address the specific error(s).

How are alarm statuses indicated on the Monitor?
For each channel, the alarm status is indicated by two red LEDs. These LEDs represent the Alert and Danger levels. Additionally, a flashing alarm LED indicates the First Out condition, which signifies the first channel to experience an alarm event.