Keyphasor Configuration
GAPn_KPH#:
VibType - KeyPhasor is used for Keyphasor applications.
Scale – Conversion from Volts to engineering units (EU). Typically, units are Volts/mils.
Scale_Off – Scale Offset to remove from measured Gap value. Units are engineering units (EU).
KPH_Thrshld – Keyphasor detection threshold for GAPn_KPH#. Value is expressed as absolute difference in Volts.
KPH_Type – Keyphasor type selection. Values are Slot, indicating the shaft has a slot or trough, or Pedestal, indicating the
shaft has a key above the shaft surface. Slot detection looks for a sharply increasing distance for the key. Pedestal looks for a
sharply decreasing distance for the key.
TMR_DiffLimt – TMR Voter Disagreement Detection Diagnostic alarm threshold for GAPn_KPH# value. Value is expressed
as absolute difference in EU.
GnBiasOvride, Gain, Snsr_Offset – Refer to Gain/Bias Override.
SysLimit#, SysLim#Enabl, SysLim#Latch, SysLim#Type – Refer to System Limits feature.
Keyphasor Application Example
PVIB/YVIB
(-10Vdc)
PR13L
PR13H
20ms (3000RPM)
(-7Vdc)
Keyphasor Sensor Monitoring Pedestal key
Keyphasor voltage inputs to a YVIB application are measured at the terminal board screws. Assume this sensor is connected
to Channel 13 as a KeyPhasor input. The shaft has a pedestal type key with a height of 15 mils above the shaft surface, so we
will detect a lower air gap when the key passes by the sensor.
Example Keyphasor Specifications
Scale Factor 200mV/mil
Nominal Gap Setting 50 mils
We will configure Channel 13 for the following behaviors:
• Return GAP13_KPH1 as mils.
• Configure the sensor as a Pedestal type Keyphasor with a threshold of 10 mils.
• Set SysLim1GAP13 to LATCH True if GAP13_KPH1 ≥ 55 mils.
• Set SysLim2GAP13 to LATCH True if GAP13_KPH1 ≤ 30 mils.
YVIB Vibration Monitor Modules GEH-6855_Vol_II System Guide 247
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