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Troubleshooting
26
3A6828B
Troubleshooting
1. Follow
Pressure Relief Procedure
, page 11,
before checking or repairing pump.
2. Turn the disconnect switch (8) to the OFF position.
3. Disconnect the PT2020 from the AC outlet.
4. Check all possible problems and causes before dis-
assembling pump.
5. Reconnect the PT2020 to the AC outlet after trou-
bleshooting.
6. Turn the disconnect switch (8) to the ON position.
Alarm
Trigger Condition
Return to Standby Condition
Solution
I/O Fault
Whenever the PLC cannot
communicate with the I/O
cards. The I/O cards control
the communication to the sen-
sors and items being con-
trolled.
Once all I/O is detected and
user acknowledges the alarm.
Check the Ethernet cable that
connects the PLC to the I/O
cards and reseat the connec-
tions, if necessary.
Contact Graco Tech Assis-
tance.
No Transducer
Whenever the 4-20 mA signal
is not in range.
Once the alarm is acknowl-
edged and the transducer is
detected.
Verify the transducer is prop-
erly connected by reseating
the cable connections.
Contact Graco Tech Assis-
tance.
Pressure Test
Failed
Interaction failed by user, or
pressure decay failed.
Once alarm is acknowledged
and pressure is relieved.
Determine what caused the
test to fail and rerun the test.
Over Pressure
Pressure went above the max-
imum test pr the over
pressure allowed threshold.
Once the alarm is acknowl-
edged and pressure is
relieved.
Check for leaks in the system.
Lower the gain setting.
Increase the over pressure
threshold if safe to do so.
Test Unsafe
A test to be run would result in
the pressure transducer being
over pressured.
Once the alarm is acknowl-
edged.
Pick a different pressure test
to run.
Verify the transducer matches
the transducer selected on the
Transducer screen.
Use a transducer that is prop-
erly sized for the pressure test.
Unable to Build
Pressure
The Pressure Test Timeout
timer expires before the set-
point pressure is reached.
Once the alarm is acknowl-
edged and pressure is
relieved.
Check for any reason the sys-
tem is not building pressure.
Increase the time on the Pres-
sure Test Timeout timer.
Increase air supply pressure.