Graco SuperCat 232721, Instructions-Parts List Manual

Page: 65 / 114

308925 65
Troubleshooting
Low Pressure Sensors
Problem Operating Condition Cause/Solution
Low pressure alarm, reservoir
fluid filters are blocked In spray mode Clean reservoir fluid filters. See Care
of the System on page 76.
Low pressure alarm, reservoir
fluid filters are clear In spray mode Check low pressure sensor connec-
tions. See
Service on page 92.
Check the low pressure setting. Ad-
just the setting to a normal pressure
for the material being pumped. See
Setup on page 57, to determine the
pressure alarm levels.
Check low pressure sensors. See
below.
Replace circuit board. See Service
on page 87.
No low pressure alarm, reservoir
fluid filters are blocked In spray mode Check that low pressure sensor op-
tion is selected. See
Setup on page
45.
Check the low pressure setting. Ad-
just the setting to a normal pressure
for the material being pumped. See
Setup on page 57, to determine the
pressure alarm levels.
Inspect and clean sensor port.
Check low pressure sensors. See
below.
Replace circuit board. See Service
on page 87.
Low pressure display value does
not change Inspect and clean sensor port. See
Service on page 92.
Check low pressure sensor. See
below.
Replace circuit board. See Service
on page 87.
High pressure displays “0” Check low pressure sensor connec-
tions. See
Service on page 92.
Check low pressure sensors. See
below.
Replace circuit board. See Service
on page 87.
Low Pressure Sensor Check
1. Check that the sensor reads 13–15 psi (90 kPa,
0.9 bar) when the sensor is removed from the
housing.
2. Switch the wire connection with the low pressure
sensor that operates. See
Service on page 92.
a. If the sensor operates with the other connec-
tion and reads 13–15 psi (90 kPa, 0.9 bar) ,
there is a problem with the wire connections or
circuit board.
b. If the sensor does not operate with the other
connection and does not read 13–15 psi (90
kPa, 0.9 bar), the sensor has failed and needs
replacement. See
Service on page 92.