23733-03 - Accelerometer Interface Modul

SPECIFICATIONS

Part Number: 23733-03
Manufacturer: Bently Nevada
Series: 3300
Supply Voltage: -23 Vdc to -26 Vdc
Current Draw: 22 mA maximum
Operating Temperature: +32° F to +158° F (0° C to 70° C)
Availability: In Stock
Country of Origin: USA

23733-03 is an Accelerometer Interface Module manufactured by Bently Nevada. An accelerator interface module is a part of accelerometer-based transducer systems, which are frequently used to monitor the vibration of gas turbines and aero-derivative generators. The interface module is intended to be used with the 3300/95 Filter Module/Vibration Monitor from the Bently Nevada 3300 series. It can also be used with 3300 monitors that have been particularly modified, such as the 3300/15 and 3300/25. The interface module's functional block diagram is displayed below:

Fig 1: Accelerometer Interface Module Block Diagram

FUNCTIONS OF ACCELEROMETER INTERFACE MODULE BLOCK DIAGRAM

• Changes an accelerometer charge input into a voltage acceleration signal.
• The voltage signal is scaled to a 10 mV/g peak (1.02 mV/m/s2 pk).
• Buffers the acceleration signal to enable long cable length connections to instruments.
• Applying a 12th-order filter with corner frequencies defined by option BB, bandpass filters the acceleration signal.
• Transforms the filtered acceleration signal into a velocity signal with a 100 mV/in/s pk (3.94 mV/mm/s pk) sensitivity.
• Buffers the velocity signal to enable extended cable length connections to monitoring devices. Machine monitoring often involves using the velocity signal.

Through pins C and A of the three-pin locking connector, the accelerometer's differential charge output connects to the interface module, while pin B is connected to the extension cable's inner shield and the housing of the interface module. The scaling step adjusts the sensitivity to 10 mV/g pk (1.02 mV/m/s2 pk) after the charge amplifier transforms the differential charge input into a low impedance voltage signal. The charge amplifier/scaling stage combination's frequency response exhibits a general bandpass transfer characteristic. For details, see Section 6. You can specify whether you want the interface module to work with accelerometers with a charge sensitivity of 50 pC/g or 100 pC/g. This choice cannot be field programmed.

The 6th order low pass and 6th order high pass filters used in the interface module are cascaded and have a Butterworth response. Filter corner frequencies are not field configurable and are chosen at ordering. The corner frequencies are typically selected to pass the vibration component at each rotor's rotational speed while rejecting higher and lower frequency signals that could be caused by structural resonances or blade passings. The basic corner frequency options meet the specifications for the aeroderivative gas turbines from the General Electric LM 2500, LM 5000, LM 1600, and LM 6000 series. The outputs for the velocity and acceleration signals can both be balanced two-wire outputs or singleended outputs. Only the + ACCEL or + VELOCITY terminal is linked to the monitoring or measuring equipment in the single-ended design. The + VELOCITY and - VELOCITY outputs with the + ACCEL and - ACCEL outputs form a differential output in the balanced two-wire mode. The (-) terminals are linked to signals common inside the interface module using an impedance that is the same as the output impedance of its counterpart. The nominal bias for the +VELOCITY and +ACCEL outputs is -10 Vdc.

Accelerometers for aero-derivative gas turbines must be qualified by the engine manufacturer and are normally included with the engine, either by the manufacturer or the packager. These types of accelerometers are often built with a piezoelectric crystal that is isolated from the accelerometer enclosure, allowing for differential output. Accelerometers used with the 86517 interface module must have the required connector and a sensitivity of 50 pico coulombs per g or 100 pico coulombs per g. A 50 pC/g charge-coupled accelerometer (part number 45357-01) is available from Bently Nevada and can be utilized with this setup. The pole-to-pole capacitance of this accelerometer is typically 1000 picofarads.

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