YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 93
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
return a return to the top of the plunger piston housing
should be audible with each actuation. If not, remove the
actuation cylinder. Inspect for a broken return spring, or a
stuck / sticking actuator piston or plunger. Replace the
spring if broken. Clean and Lubricate the actuation
cylinder and actuation piston assembly. Manually push
the plunger into the seal assembly and ensure it returns
completely and freely. If sticking continues to occur, the
seals should be replaced. Reassemble and see if alarm
reoccurs after a system restart.
5. If pump actuation is normal:
a. Inspect the discharge lines and valves for a
restriction.
b. Inspect all the check valves on the discharge
side of the pump, from the NJEX System to the
pipeline, for proper operation.
c. A back pressure regulating device must be
installed immediately outside the NJEX enclo-
sure on the odorant line leading to the pipeline
injection point. Perform a forward purge noting
the time required to empty the Verometer. If the
time to empty the Verometer is longer than 30-
45 seconds, after the level begins dropping,
replace the Verometer filter, and restart the
system. During the system restart monitor the
controller and observe if the alarm reoccurs.
d. Replace the inlet check valve to the pump.
6. If problems persist, contact YZ technical service for
additional assistance.
Specific Pump Failure Alarm Issues
Troubleshooting Steps
When an active
Pump Failure
alarm is indicated the
following steps should be taken:
1. Verify that the Verometer has odorant in it, and that
the expansion tank has the proper pressure in it of
25 psi
( 1.72 Bar)
.
Note: If the Verometer is empty, restart the system.
Stroke to the pump to cyle odorant through the system
and observe if the alarm reoccurs.
2. Verify that the pump volume spacer matches the
pump displacement parameter in the controller.
3. Verify that all valves and check valves are properly
set system operation. Inspect for valve settings that
can restrict pump displacement.
4. Check the actuation gas filter for flow resriction or
closure.
5. Ascertain whether the pump is properly stroking.
a. If pump actuation does not occur as the Test
key is pressed, remove the actuation gas line at
the top of the pump and test the pump stroke
again. As the
Test
key is pressed, there should
be a burst of gas at the open actuation supply
connection. If gas is released from the open
actuation supply line skip to subsection
5.g
. ,
otherwise continue to
5.b
.
b. If gas is not blown from the loose connection,
disconnect the hose leading from the pump
solenoid to air relay valve. Test stroke the pump
again and observe if gas is discharged from the
small hose.
c. If gas comes out of the solenoid briefly when
the
Test
key is pressed the solenoid is good
but, the air relay valve requires service or repair.
d. If small hose does not release gas, remove the
pump solenoid wiring cable, the solenoid
located on the right of the two solenoids. Next,
connect a volt meter to the two parallel posts of
the solenoid cable. As the
Test
key is pressed,
obseve if a 12VDC current becomes present.
If a voltage is detected the solenoid should be
replaced.
If a volt meter is unavailable, the fill valve signal
may be used to test the solenoid. First, test the
fill valve function to verify that it is working
properly before using it to test the pump
solenoid. Second, verify that the Verometer is
less than 100 % full on the level indication.
Thrid, take the cable connected to the fill valve
Содержание NJEX 8300G
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