LMVibnA, LMVibnB, LMVibnC – Magnitude of 1X harmonic relative to specified frequency (RPM) in Engineering Units
(EU). This function is available for Inputs 1-3 only.
1X LM Tracking Filters measure the peak velocity component at a specified frequency in RPM. The YVIB module receives
the frequency through the variables LM_RPM_A (for LMVib1A, LMVib2A, and LMVib3A), LM_RPM_B (for LMVib1B,
LMVib2B, and LMVib3B), and LM_RPM_C (for LMVib1C, LMVib2C, and LMVib3C). The calculation is the same for all 9
inputs, with only the input channel or shaft speed source changing. Values are converted from Volts to EU.
SysLim1GAPn, SysLim2GAPn – System Limit status for GAPn_VIBn value as True/False.
SysLim1VIBn, SysLim2VIBn – System Limit status for VIBn value as True/False.
SysLim1ACCn, SysLim2ACCn – System Limit status for LMVibnA/B/C value as True/False.
ACC1, ACC2, and ACC3 correspond to LMVib1A, LMVib1B, and LMVib1C.
ACC4, ACC5, and ACC6 correspond to LMVib2A, LMVib2B, and LMVib2C.
ACC7, ACC8, and ACC9 correspond to LMVib3A, LMVib3B, and LMVib3C.
CDM Configuration
GAPn_VIBn:
VibType – CDM_BN_ChgAmp, CDM_PCB_ChgAmp are used for CDM applications.
Note CDM_PCB_ChgAmp expects a positively biased sensor and will use a pull-down to N28 for open circuit detection.
CDM_BN_ChgAmp expects a negatively biased sensor, and will use a pull-up to P28. There is a TVBA jumper to select
pull-up or pull-down voltage that must be in the correct position.
CDM_Probe_Gain – CDM Probe gain, typically expressed in pico-coulombs/PSI.
CDM_Amp_Gain – CDM Charge Amplifier gain, typically expressed in mV/ pico-coulomb.
Note CDM_Probe_Gain and CDM_Amp_Gain are hidden from view until a CDM Sensor is added.
LMlpcutoff – LM 1X Tracking Filter low-pass cutoff. Effective LM 1X Tracking Filter bandwidth is twice the value of this
field.
TMR_DiffLimt – TMR Voter Disagreement Detection Diagnostic alarm threshold for GAPn_VIBn value. Value is expressed
as absolute difference in Volts.
GnBiasOvride, Gain, Snsr_Offset – See Gain/Bias Override
SysLimit#, SysLim#Enabl, SysLim#Latch, SysLim#Type – Refer to System Limits feature.
Note Scale, Scale_Off – Unused for this sensor type.
VIBn:
VIB_CalcSel – Select calculation method for VIBn value between Peak Dynamic Pressure and RMS Dynamic Pressure.
258 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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