YZ Systems NJEX 7300L Instructions & Operating Manual Download Page 94

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YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 84

NJEX 7300L ver.09042003

SSSSS

ECTION

13:

13: 7300L S

7300L S

YSTEM

STEM

TTTTT

ROUBLESHOO

OUBLESHOO

OUBLESHOOTING

TING

Tank Level Alarm,

Continued

IMPOR

IMPORTTTTTANT NO

ANT NO

ANT NOTE:

TE:

The tank level indication has a variance of

2% for accu-

racy. 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 approximately
match the electronic level indication perform the
following checks.

a. Inspect to verify that the wiring to the controller

termination strip TB-1 is still intact. Look for
loose or broken wires at TB-1, pin number 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.

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 controller 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 connections for the
presence of moisture or corrosion. If moisture or
corrosion is found correct by replacing affected
components. Simply cleaning the connection 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 battery or

power supply voltage for the system has dropped
below 11.0 volts.

Battery Alarm Troubleshooting

Steps

1. First determine why the battery is low. For example,

inspect for charging system issues, battery prob-
lems, or excessive current draw.

a. Disconnect the charger power supply cable

(Yellow cable) from the lower bulkhead connec-
tion on the electronics enclosure.

b. Evaluate connections for any corrosion that may have

prevented current from reaching the battery. If
corrosion is found clean or replace affected compo-
nents as necessary, and place back into service with a
fully charged battery pack in place.

c. Test the output from the charger power supply

cable (yellow) with a volt meter. Voltage from
this cable should read 18 - 20VDC, when the
Line Power Supply - LPS connected to AC
current is in use. If voltage is low, service, or
replace LPS components as necessary.

d. If everything has checked out to this point, open

the control panel assembly to expose the
battery pack. Next un-plug the battery pack at
the cable connection on the left side of the
enclosure. Carefully read the voltage from the
battery. Typically, the battery should read over
12.5VDC. If no reading is found here the fuse to
the battery is blown and must be replaced.
Contact YZ Systems for the a replacement.

Note: Use only the orginally specified fuse for replacement.

e. 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 compo-
nent should be replaced.

2. If problem can not be resolved at this point contact

YZ Systems Technical Service.