IS210DDPTH1A

IS210DDPTH1A is a Dynamic Pressure Transducer Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE distributed Gas Turbine Control Systems. The DDPT is a compact acoustic terminal board for DIN-rail mounting. The board accepts two pressure transducers for monitoring pressure waves in gas turbine combustion chambers, using either Vibro-meter or Bently-Nevada transducers. It connects to the I/O board with two cables and is designed to meet Class 1, Division 2 environmental requirements for hazardous gases.

INSTALLATION:

The DDPT board slides into a plastic holder, which mounts on the DIN rail. The pressure transducers are wired to the permanently mounted Euro-Block type terminal block, which has 42 terminals. Typically #18 AWG shielded twisted triplet wiring is used. There are ten screws for the SCOM (ground) connection. DDPT works with the VAMA I/O board. Cable connections from DDPT to the VAMA are made from JR1 to the J3 connector on the lower portion of the VME rack, and from JR5 to the J5 connector on the front panel of the VAMA. These are latching-type connectors to secure the cables.

OPERATION:

The I/O board supplies either positive 24 V dc or negative 24 V dc to the DDPT to power the pressure sensing equipment. The third-party vendor equipment supported are the Vibro-meter Galvanic Separation Unit Types GSI 1_ _, the Bently-Nevada 86517 with modifications 142533 or 159840 charge amplifier, or the Bently-Nevada dynamic pressure charge amplifier 350500. The Vibro-meter GSI 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 mA/psi.

The GSI unit provides an output ac signal (approx. ± 2 V peak) that represents the dynamic pressure (gain expressed in milli-volts/psi ) riding on top of a dc bias voltage of approximately +7 V dc. The GSI unit requires a +24 V dc power supply. Normally, the power supply return for the GSI will be grounded externally and the PCOM on the terminal board is not used. Only use PCOM 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 output is comprised of an 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.