YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 85
NJEX EUR ver. 08-2021
Section 13: NJEX System Troubleshooting
Signal Alarm
•
The
Loss / Signal
alarm will be active only in the
Analog Proportional-To-Flow
mode. It indicates
that the flow signal voltage has dropped below
.5VDC. A correct flow signal should never drop be-
low 1VDC.
•
Over Flow >125%
is an indication that the flow sig-
nal is showing greater than 125% of the maximum
gas flow according to the set up conditions indicated
in the parameter and calibration sections of the
controller.
Non-Alarm Signal Indicators
•
Low Flow
indicates that the flow, as indicated by
the flow signal, has dropped to or below a level as
indicated by the Low Flow Shutoff default parameter
in the controller.
•
Over Flow >110%
is an indication that the flow
signal is showing greater than 110% and less than
125% of maximum gas flow according to the set up
conditions indicated in the Parameter and Calibra-
tion sections of the N-300 controller
•
No Flow
is an indication that the flow signal be-
ing recieved by the NJEX System currently reads
a no flow situation in the pipeline and therefore no
odorant is currently being injected. Odorization will
automatically resume when the flow signal indicates
flow in the pipeline.
•
Low Flow Shut Off
is an indication that the flow
signal being recieved by the odorizer, indicates
that present flow in the pipeline is less than the set
value for the Low Flow shut Off set in the in the
Parameter section of the N-300G . When the flow
rate drops below this value odorant injection stops
and therefore no odorization is presently occuring.
Odorization will automatically resume when the flow
signal returns to a level above the set point to stop
odorization.
Signal Alarm & Non-Alarm
Troubleshooting Steps
1. The
Loss of Flow
alarm will only be active with
a Linear or Non-linear Analog signal. This alarm
will be activated any time the flow signal goes
completely away or drops below .5v
(2Ma)
.
Should this alarm occur check the flow signal on
TB1
pins
2
and
3
. Be certain the flow signal is
connected to
TB1
, via the ten pin connector at
pins
2
and
3
. If the signal is above .5v
(2Ma)
,
check your grounding system. If it is .5v
(2Ma)
or less, repair the flow signal source or cable as
required.
2. The
Overflow
alarm will be indicated when the
flow signal indicates 125% of the indicated span
set point.
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
TB1
pins
2
and
3
. If the
voltage reading on the volt meter is greater
than 5v, the problem resides with the trans-
mitted 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 this alarm activates, two issues
could generate this alarm. First, the span fre-
quency could be set incorrectly. Recalculate
the span frequency and inspect the setting in
the Calibration section of the N-300 Controller.
The other cause could be the result of electri-
cal noise interferance resulting in the system
intrepreing this noise as pulses.
c. If it is believed this is in error or the situation
continues to reoccur, the flow signal calibra-
tions, and parameters should be re-calibrated
with corrected values.
Summary of Contents for NJEX 6300G
Page 1: ...NJEX 6300G 7300G N A T U R A L G A S O D O R I Z A T I O N S Y S T E M...
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Page 3: ...NJEX 6300G 7300G Instruction Operating Manual Version 08 2021...
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