Advanced Instructions; Troubleshooting - Emerson NGA2000 Reference Manual

Reference Manual
748384-C
September 2003
b.

Advanced Instructions

The menu paths as above.
Set the response time values for longer
times on the lower ranges.
If there are apparent network collision prob-
lems, set the LON update rate to 1 per sec-
ond.
For the most precise calibrations, set the
response times to 20 or 30 seconds prior to
a calibration, and then set them back to
short times for operation.
c.

Troubleshooting

Noisy analyzer signal...
The response time may be too short. In-
crease it until the noise level is satisfactory.
1-24 Introduction
NGA2000 Reference
Poor system response to menu changes,
and poor response to variable editing...
The LON update rate is too fast in one or
more analyzers. Go through them all, set-
ting the update rate to 10 per second from
ASAP, or 1 per second. Via a PC, the
variable to change is LONPVUPDATE, and
it should be set to a value of 1 or 2.
One analyzer in a system responds
faster than another on the same gas
change...
Set the response time of the faster analyzer
to the same as that of the slowest one. If
there is still a problem, set the delay time of
the faster analyzer so as to delay its signal
compared with the slowest one. It can be
hard to do this properly if you have very dif-
ferent response, times.
Rosemount Analytical Inc. A Division of Emerson Process Management