YZ Systems NJEX 6300G, Instructions & Operating Manual, Page: 94 / 128

YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 84 NJEX EUR ver. 08-2021
Section 13: NJEX System Troubleshooting
Tank Level Alarm
,
Continued
IMPORTANT NOTE:
The tank level indication has a variance of
+
2% for ac-
curacy. If the alarm is on and the mechanical level
indicator is close to the alarm set point the alarm is
probably valid and the accuracy variance is all that is
being noted.
Tank Level Alarm Troubleshooting
Steps
1. Verify the tank level indication on the manual
tank gage. If the level indication does not ap-
proximately match the electronic level indication
perform the following checks.
a. Inspect to verify that the wiring to the control-
ler termination strip TB2 is still intact. Look
for loose or broken wires at TB2 , pin num-
ber 21 (Red Wire) , 22 (Black Wire) , and 24
(Shield) . Repair any loose or broken wires.
b. Inspect the level sensor at the tank for possible
damage or moisture in the sensor head. Repair
or replace as required if moisture is inside the
sensor.
c. Inspect the cable between the sensor an control
head for damage. Repair or replace as necessary.
d. Observe the other values on the N-300 control-
ler such as the temperature, battery voltage, and
Verometer level, etc. for any unexpected values. If
another value is found to be abnormal, inspect the
bulkhead connector to interconnect cable connec-
tions for the presence of moisture or corrosion. If
moisture or corrosion is found correct by replacing
affected components. Simply cleaning the con-
nection may not correct the problem temporarily or
permanently.
2. If the level indication on the manual gage and the
electronic level indication are approximately the
same, within
+
2% as indicated above, then the
system is working correctly. If you wish to change
the alarm set points, or disable the alarm, proceed
to the Set Parameters section of the controller and
make necessary changes to clear the alarm.
Battery Alarm
• The Low Battery Alarm indicates that the customer
supplied, intrinsically safe power supply voltage for
the system has dropped below 11.5 volts DC.
Battery Alarm Troubleshooting
Steps
1. First determine why the voltage is low. For ex-
ample, is there a low voltage from the IS barrier or
a drop of voltage in the cable?
2. Finally to evaluate for possible excessive current draw.
Begin by disconnecting the cables one at a time to
each solenoid and to the verometer. Note the change
in voltage reading on the screen as any one cable is
disconnected. Should you find one with a significant
effect on the system voltage, that component should
be replaced.
3. If problem can not be resolved at this point con-
tact YZ Systems Technical Service.