108
Reference Manual
00809-0300-4750, Rev CA
Advanced Configuration Functionality
March 2016
Advanced Configuration Functionality
5.4.5
PV damping
Primary variable damping allows selection of a response time, in seconds, to a step change
in flow rate. It is most often used to smooth fluctuations in output.
5.4.6
Signal processing
The Rosemount 8750W contains several advanced functions that can be used to stabilize
erratic outputs caused by process noise. The signal processing menu contains this
functionality.
If the 37 Hz coil drive mode has been set, and the output is still unstable, the damping and
signal processing function should be used. It is important to set the coil drive mode to 37 Hz
first, so the loop response time is not increased.
The Rosemount 8750W provides for a very easy and straightforward start-up, and also
incorporates the capability to deal with difficult applications that have previously
manifested themselves in a noisy output signal. In addition to selecting a higher coil drive
frequency (37 Hz vs. 5 Hz) to isolate the flow signal from the process noise, the Rosemount
8750W microprocessor can actually scrutinize each input based on three user-defined
parameters to reject the noise specific to the application.
See
for the detailed description of how the signal processing works.
Operating mode
The
operating mode
function can be set to
normal
mode or
filter
mode. If set to
normal
mode, and the signal is noisy and provides an unstable flow reading, switch to
filter
mode.
Filter
mode automatically uses 37 Hz coil drive frequency and activates signal processing at
the factory set default values. When using
filter
mode, perform an
auto zero
with
no flow
and
a full sensor. Either of the parameters (coil drive mode or signal processing) may still be
changed individually. Turning
signal processing
off or changing the coil drive frequency to 5
Hz will automatically change the
operating mode
from
filter
mode to
normal
mode.
LOI menu path
Field Mount: Detailed Setup, Sig Processing, PV Damping
Wall Mount: DAMPING
Traditional Fast Keys
1, 4, 4, 5
Device dashboard
2, 2, 8, 1
LOI menu path
Field Mount: Detailed Setup, Sig Processing
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 4, 3, 1
Device dashboard
2, 2, 8, 6
LOI menu path
Field Mount: Detailed Setup, Sig Processing, Operating Mode
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 4, 3, 1
Device dashboard
2, 2, 8, 5, 1
Содержание Rosemount 8750W
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