GE Mark VIeS - Configuration of System Limits; System Limits Implementation; Legacy Peak-Peak Algorithm

SysLim # Type
Comparison
(A >= B or
A <= B
)
A
B
Out
SysLim #GAPn
SysLim#VIBn
SysLim#ACCn
SysLimit #
RSTSYS
SysLim
#
Latch
Set Dominant
Latch
Set
Rst
NotLatch
Latch
VIBn
POSy
#
GAPn
_
GAPn
_
GAPn
_
KPH
VIBn
LMVibnA
System Limits Implementation
From the ToolboxST application, Component Editor, I/O pack, Parameters tab, there is a global System Limit disable
parameter, SystemLimits. When this parameter is set to Disable, all system limits in the YVIB are set to False, and a
diagnostic alarm is generated.
Configuration of System Limits
Item Description
Choices
SysLimit# Set point for the System Limit check. Value is expressed in EU for that point. Textfield
SysLim#Enabl Enable or Disable this specific System Limit check. Value is an enumerated type. Enable or Disable
SysLim#Latch Configure whether system limits should latch TRUE. Value is an enumerated type. Latch or NotLatch
SysLim#Type Configure whether system limits checks are greater than set point or less than set point. Value is an
enumerated type.
<= or >=
8.3.2.3 Legacy Peak-Peak Algorithm
The default vibration algorithm, which is the only vibration algorithm implemented by the YVIBS1A, is a windowed peak
detection function. A window size (scan period) is determined by the current rotor speed on GAP13_KPH1. If there is no
keyphasor input, 160 ms scan period is the default. As new input data is processed, it fills the window in. When the window is
full, we calculate the peak-peak measurement, scale it, and send it to signal space. The window is then emptied and needs to
be completely filled again before a new peak-peak value is computed. For this reason, the effective update rate is the scan
period, not frame rate.
Signal Space Value
Frame
Period
Scan
Period(s)
Vpp
238 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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