Rockwell Automation 1440-VAD02-01RA XM-123 Aeroderivative Module - Manual (Page 71)

Publication GMSI10-UM003D-EN-P - May 2010
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Threshold Multiplier The action to take when the setpoint multiplier
switch is closed (push button engaged or toggle
switch flipped to on) and during the startup period
once the switch is reopened. The module applies the
multiplier to the alarm thresholds during this time to
avoid false alarms at resonance frequencies.
Note: The multiplication may have the opposite of
the intended effect under certain circumstances. For
example, if the Condition is set to "Less Than" and
the thresholds are positive, then multiplication of the
threshold values increases the likelihood of the
measured value being within the alarm range.
Therefore, you may want to set Threshold
Multiplier to zero to disable the alarm during the
startup period.
Enter a floating point value in the
range of 0 to 10.
Enter 0 (zero) to disabled the alarm
during the startup period.
Inhibit Tachometer Fault Controls whether to inhibit the tachometer fault
during the startup period.
During startup, the machine may be turning very
slowly and cause the XM module to detect a
tachometer fault. The Alarm status will state that a
tachometer fault condition exists unless the
tachometer fault is inhibited.
Speed Range Enable Controls whether the selected alarm is enabled only
when the measured speed is within a machine speed
range. Enter the machine speed range in Speed
Range High and Speed Range Low.
Note: The tachometer must be
enabled (Pulses Per Revolution set
to 1 or more) and a tachometer signal
must be provided at the tachometer
input when Speed Range Enable is
enabled.
Note: You cannot enable the Speed
Range parameter when alarm
Measurement is set to "Speed." See
page 61.
Alarm Parameters
Parameter Name Description Values/Comments
XM Configuration
Utility EDS File
Check means inhibit
tachometer fault Inhibit Tach
Fault
Clear means do not
inhibit tachometer
fault Do not inhibit
XM Configuration
Utility EDS File
Check to Enable Enabled
Clear to Disable Disabled