Eddy-Current Or Proximitor Sensors For Keyphasor - GE Mark VIeS System Manual

8.5.2.5 Eddy-current or Proximitor Sensors for Keyphasor

The TVBA provides channels 12 and 13 to connect an Eddy-current or Proximitor sensor used for a Keyphasor function. The
Bently Nevada Proximitor 3300 family or Metrix Model 5533 are -24 V powered devices with the output signal proportional
to the gap between the rotating shaft and the head of the probe. Velocity information is extracted from the AC content riding
on top of the DC gap signal. The shield is tied to chassis at the control end and left open on the sensor end to prevent
circulating ground currents.
JPxA jumper is in the 'P,A' position providing a +28 V weak pull-up for sensor failure detection and the JPxC jumper is in the
'PCOM' position to provide a return for the -24 V power supply sourced from the -28 V WNPS daughter-boards for the
TVBAH#A and TVBAS#A terminal boards only, and a low-side for the signal output of the sensor. JPxB is set in the 'PVA'
position.
YVIB Vibration Monitor Modules GEH-6855_Vol_II System Guide 279
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