YZ Systems NJEX 6300G, Instructions & Operating Manual, Page: 102 / 128

YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 92 NJEX EUR ver. 08-2021
Section 13: NJEX System Troubleshooting
IMPORTANT NOTE:
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
operation, 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 Verom-
eter 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 indica-
tors 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 mainte-
nance has been performed due to variances in
the Verometer level during the conduct of ser-
vice. 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
unchanged and correct as needed. The pipeline
pressure should be at least
17.24 Bar
.
a. Inspect the installation for the use of a back
pressure regulating device. For pipeline pres-
sures less than
17.24 Bar
a back pressure
regulating device must be installed immedi-
ately outside the NJEX enclosure on the odor-
ant 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 for pressures less than
17.24 Bar
.
If a back pressure regulating device is not in-
stalled as described above, install the device
before proceeding.
b. If line pressure is less than
17.24 Bar
and a
back pressure regulating device is installed
on the odorant injection line, inspect the back
pressure regulating device for proper opera-
tion, 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 displace-
ment reading. Actual installation conditions may have
an effect on the real pump performance. Use the
accurate pump displacement as calculated by the
controller for the final pump displacement 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 actua-