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Click to Show Advanced Parameters.
Set SysLim1Enabl and SysLim2Enabl parameters to Enable.
Set SysLim1Latch to NotLatch and SysLim2Latch to Latch.
Set SysLim1Type and SysLim2Type to ">=".
Set SysLim1 to "3.0" ips and SysLimit2 to "5.0" ips.
Navigate to the Variables tab. Select LM_RPM_A and attach a variable containing the rotor speed of 3000 RPM to it. If the
LM 1X Tracking Filter is not desired, omit this step.
If the YVIB firmware is correctly receiving the data, we would expect:
• Gap values are passed through a 2-pole, low-pass filter with a cutoff frequency of 8 Hz. This will attenuate the 50Hz, 1Vpp
vibration by nearly 40:1, and the DC component of -12 V dc will be unaffected. Since the units for GAP1_VIB1 are always
Volts, and the 40:1 reduced AC wave will be ±0.025 volts, the GAP1_VIB1 value will be -12 ± 0.025 Volts.
• For Vib values, the DC removal filter will eliminate the DC component of -12 V. The 50Hz, 1Vpp AC portion will pass
through the wideband filter unaffected and be sent to a 160ms capture window, which will capture 8 cycles. The RMS value
computed for this input (ideal sine wave) will return .353VRMS, which will be converted to inches/sec, so VIB1 value will be
3.53 inches/sec. • SysLim1VIB1 will be true, since VIB1 ≥ 3.0 ips. SysLim2VIB1 is false.
• LMVib1A value is the magnitude of the 1X harmonic of the rotor speed in LM_RPM_A, which is 3000RPM. Since the
input wave is an ideal sine wave with a frequency of 3000RPM, the value of LMVib1A will be 5.0 inches/sec.
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GEH-6855_Vol_II
GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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