YZ Systems NJEX 8300G, Manual, Page: 93 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 86
NJEX 8300 ver .092001 ATEX Rev.
SSSSS
ECTION ECTION ECTION ECTION ECTION
13: 13:
13: 13:
13: 8300 S 8300 S
8300 S 8300 S
8300 S
Y YY Y YSTEM STEM STEM STEM STEM
TTTTT
R RR R ROUBLESHOO OUBLESHOO OUBLESHOO OUBLESHOO OUBLESHOOTING TING TING TING TING
Signal Alarm & Non-Alarm
Troubleshooting Steps,
Continued
3. Low flow indication is not an actual alarm, but an
indication that the system is reading the flow signal
to indicate the system is in the low flow shut off
condition stipulated by the low flow shut off param-
eter. If it is felt this indicator should not be on, given
the current flow, first check the parameter for the
Low Flow Shut-Off to verify it is set as desired. As a
second step, evaluate the flow signal being recived.
Verify that the signal indicats the correct flow, and
that the signal spanned and zero referenced
correctly. If necissary correct as required.
4. Overflow indicator will activate when the flow signal
is showing greater than 110% and less than 125%
of the maximum gas flow according to the set up
conditions indicated in the parameter and calibration
sections of the N-300 controller.
a. If reading an analog flow signal, linear or non-
linear), a grounding reference error can cause
this condition. Check that the grounding system
is correctly in place. Read the flow signal
voltage on
TB-1 pins 2 and 3 . If the voltage
reading on the volt meter is greater than 5v, the
problem resides with the transmitted signal.
Correct as necessary at the signal source. If
the voltage on the volt meter is within the 1-5v
range, the problem is most likely a grounding or
isolation issue. This can be corrected by re-
establishing the ground or installing a signal
isolator device.
b. If the NJEX System is set to recieve a pulse
signal and recieve this alarm, two issues could
genreate this alarm. First, the span frequency
could be set incorrectly. Recalculate the span
frequency and inspect the setting in the
Claibration section of the N-300 Controller. The
other cause could be the result of electrical
noise interferance resulting in the system
intrepreing this noise as pulses.
Verometer Alarm
There are a variety of Veromter alarms monitored by the
N-300 Controller to ensure correct and safe operation of
the NJEX System. The alarms relating to Verometer
performance and their description is as follows:
• Vmtr-Cable alarm indicates a failure to comunicate
between the verometer and the N-300G controller.
• No Fill alarm is activated triggered if the Verometer fails
to fill to 100% within 6 minutes after a fill is requested.
• Slow Fill alarm is indicated when a fill of the
Verometer is requested and the Verometer does not
fill to 100% within 3 minutes. This alarm actuates with
either an automatic or manual fill request.
• Leakage is indicated when pump displacement is
calculated with a greater than 50% above parameter
safety. As if Verometer was leaking fluid and system
will not continue to refill.
• Flvalv-Fail alarm indication is signaled if the level in
the Verometer increases when a fill is not requested
by the controller.
• OdorInlet Cable alarm indicates a failure to
comunicate between the fill valve pressure transducer
on the Bulk Odorant Storage Tank side and the N-
300G controller.
• OdorInlet Lo alarm indicates that the odorant pres-
sure has dropped lower than defined in the set up
parameters in the N-300G controller.
• OdorInlet Hi alarm indicates that the odorant pres-
sure has exceeded the maximum pressure as defined
in the set up parameters in the N-300G controller.
• XTank - Cable alarm indicates a failure to comunicate
between the Expansion Tank transducer on the fill
valve assembly and the N-300G controller.
• XTank Low alarm indicates the pressure in the
expansion tank has dropped below the defined
minimum set point for the Expansion Tank.