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SPECIFICATIONS:
Part Number: IS200VAMAH1A
Manufacturer: General Electric
Series: Mark VI
Product Type: Acoustic Monitoring Board
Number of Channels: 24
Technology: Surface Mount
Number of Transducers: 2
Buffered signal outputs: 2
Common Mode Voltage Range: ±5 V
Dimensions: 11.00 x 9.00 x 3.00
No.of Ribbon Cable Connectors: Two, 20-pin
No.of VMEbus Connectors Two, 96-pin
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421M
FUNCTIONAL DESCRIPTION:
IS200VAMAH1A is an Acoustic Monitoring Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Turbine Control Systems. The Acoustic Monitoring (VAMA) board monitors acoustic or pressure waves in the turbine combustion chamber. Inputs are wired to the DIN-rail-mounted DDPT terminal board. DDPT supports the simplex mode only and connects to VAMA through the J3 connector on the VME rack where VAMA is located. The VAMA/DDPT meets the environment rating for hazardous gases of Class I, Division 2, and provides suppression at all points of signal entry or exit. Each cable has a unique ID chip. The VAMA provides two-point calibration, based on a reference offset and gain signal. Gas turbine combustion chambers can experience pressure oscillations that cause noise in the audible hearing range. The H1A version of the VAMA offers signal conditioning and software that allows the turbine control to monitor the pressure/acoustic waves by reading the conditioned signals from a dynamic pressure transducer. The VAMA provides two channels to read the pressure/acoustic wave signals from third-party equipment from Vibro-Meter® or Bently-Nevada*. VAMA provides two dedicated signal conditioning paths to remove the DC component of the signal, modify the gain, and provide an eighth-order or better low-pass filter for anti-aliasing.
OPERATION:
The Vibro-Meter setup conditions a pico-coulomb output from a dynamic pressure transducer (Vibro-Meter CP216 or CP231) through a charge amplifier (Vibro-Meter IPC 704) with a current output representing approximately 125 μA/psi. The GSI unit outputs an ac signal (approx. ±2 V peak) that represents the dynamic pressure (gain expressed in mV/psi ) riding on top of a dc bias voltage of approximately +7 V dc. The Vibro-Meter GSI unit requires a +24 V dc power supply. Normally, the power supply return for the GSI is grounded externally and the PCOM on the terminal board is not used. PCOM should only be used when the external return ground is not used. The Bently-Nevada 86517 interface module converts the dynamic pressure transducer charge signal from pico-coulombs to milli-volts, which represents the pressure in psi. The interface module outputs ac signal (approx. ±1.2 V peak) riding on top of a negative DC bias voltage of approximately -10 V dc. The Bently-Nevada unit requires a -24 V dc power supply.
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What type of output does the dynamic pressure transducer produce?
The dynamic pressure transducer (Vibro-Meter CP216 or CP231) produces a pico-coulomb output, which is further conditioned for monitoring purposes.
What is the purpose of the charge amplifier (Vibro-Meter IPC 704)?
The charge amplifier serves to condition the pico-coulomb output from the dynamic pressure transducer, converting it into a current output representing approximately 125 micro A per psi (pounds per square inch).
What type of signal does the Vibro-Meter GSI unit output, and how is it represented?
The Vibro-Meter GSI unit outputs an AC signal representing the dynamic pressure, with an approximate peak voltage of 2 V. This signal rides on top of a DC bias voltage of approximately 7 V.
