Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 115)

Publication GMSI00-UM001A-EN-E - February 2005
Enpac Ex Parameters 109
Mach. Speed Controls the amount of time auto-ranging will wait
to ensure it has seen the peak signal value of the
sample.
• Normal - Sets the auto-ranging algorithm to only
track signals above 120 RPM. Therefore, use this
setting when the machine speed is greater than
120 RPM.
The normal speed setting guarantees the waiting
time be no longer than 0.5 seconds. It will
significantly improve auto-ranging times and
therefore data collection times for any points that
have low filters (<2 Hz) selected.
• Slow - Sets the auto-ranging algorithm down to
the Low Pass Filter setting. (If none, it will track
down to approximately 0.33 Hz or 20 CPM.)
Therefore, use this setting when the machine
speed is less than 120 RPM.
The slow speed setting enables low frequency
auto-ranging to accommodate collection of low
frequency components. For slow speed equipment,
this is necessary to ensure adequate sampling and
collection of the peak signal. The slow speed
setting allows the Enpac Ex to auto-range on
machines running as slow as 20 RPM.
The auto-ranging algorithm makes an assumption
about the speed of the machine that is being
monitored in order to determine how long to wait
for the peak signal value to be seen. With the slow
speed setting, the wait-time is calculated as 1 /
f
hpf
where f
hpf
is the high-pass filter cutoff in Hz for
the current point. For example, if a 0.36 Hz filter is
selected, the auto-ranging algorithm will wait for 1
/ 0.36 = 2.78 seconds to make sure it has seen the
peak signal value.
Options: Normal (default)
Slow
Important: When faster data
collection is desired, set
Autoranging to "Aggressive" and
Mach. Speed to "Normal."
Settling Delay The amount of time the Enpac Ex should delay data
acquisition after applying power to an ICP
accelerometer. Enter a value from 0.00 to 60.00
seconds
Instrument Configuration Parameters
Parameter Name Description Values/Comments