YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 92
NJEX 7300L ver.09042003
SSSSS
ECTION
ECTION
ECTION
ECTION
ECTION
13:
13:
13:
13:
13: 7300L S
7300L S
7300L S
7300L S
7300L S
Y
YY
Y
YSTEM
STEM
STEM
STEM
STEM
TTTTT
R
RR
R
ROUBLESHOO
OUBLESHOO
OUBLESHOO
OUBLESHOO
OUBLESHOOTING
TING
TING
TING
TING
gramed pump displacement value.
IMPOR
IMPOR
IMPOR
IMPOR
IMPORTTTTTANT NO
ANT NO
ANT NO
ANT NO
ANT NOTE:
TE:
TE:
TE:
TE:
When a system re-start is requested at completion or during
the the service of an NJEX System, use the N-300 controller
to stop and restart the system from the main menu.
After a restart, the default values will be used for opera-
tion, and alarms will be cleared until actual performance
values can be ascertained by the N-300 controller. In the
case of the pump displacement this may not occur until
the pump has drained the Verometer to approximately
the 90% level. An * will appear by the indicated pump
displacement after a stop and restart. This indicates that
the displayed value is a default parameter value, which
is not a real pump performance indication. As a result,
this defualt pump performance indication should not be
relied upon as the actual pump performance.
Do not prematurely assume the problem has been resolved,
simply due to the disappearance of the indicators and alarms
immediately after a re-start of the NJEX System.
Pump Over Pumping Alarm
Troubleshooting Steps
When an active Over Pumping alarm is indicated the
following steps should be taken:
1. This alarm may occur after service or maintenance
has been performed due to variances in the Verom-
eter level during the conduct of service. If service
has recently been performed, and this alarm occurs,
stop and restart the system to observe if the alarm
re-occurs, thus indicating a real alarm. If the alarm
re-occurs continue to step 2 below.
2. Verify that the operating conditions remain un-
changed and correct as needed. The pipeline
pressure should be at least 250 psi (17.24 Bar).
a. Inspect the installation for the use of a back
pressure regulating device. A back pressure
regulating device must be installed immediately
outside the NJEX enclosure on the odorant line
leading to the pipeline injection point. A back
pressure regulating device can aliviate the over
pumping conditions that can result by the
varying pressures and temperatures in the
pipeline. If a back pressure regulating device is
not installed as described above, install the
device before proceeding.
b. Inspect the back pressure regulating device for
proper operation, and installation as described
above.
3. Verify that the actuation pressure remains un-
changed from previous setting.
4. Verify the pump displacement parameter setting is
the same as the desired pump displacement.
Pump Under Pumping Alarm
Troubleshooting Steps
When an active Under Pumping alarm is indicated the
following steps should be taken:
1. If maintenance or repair has just been performed,
stop and restart the system to see if the alarm re-
occurs indicating a real alarm. If the alarm re-occurs
continue to the next step.
2. Verify operating conditions. Correct as needed.
3. Verify that the pump displacement parameter
matches the accurate pump displacement.
Note: When starting a system for the first time the
expected pump displacement should be set in the N300G
controller parameters section. The system should then be
run through at least one complete Verometer cycle to get
an accurate pump displacement reading. Actual installa-
tion conditions may have an effect on the real pump
performance. Use the accurate pump displacement as
calculated by the controller for the final pump displace-
ment parameter to be entered into the controller.
4. Check to see if the pump operation sounds the same as
previously. A distinct bottoming of the plunger piston and
return a return to the top of the plunger piston housing
should be audible with each actuation. If not, remove the
actuation cylinder. Inspect for a broken return spring, or a