Low Pressure Sensors; Low Pressure Sensor Check - Graco SuperCat 232096 Instruction Manual

Low Pressure Sensors

Problem
Low pressure alarm, reservoir
fluid filters are blocked
Low pressure alarm, reservoir
fluid filters are clear
No low pressure alarm, reservoir
fluid filters are blocked
Low pressure display value does
not change
High pressure displays "0"

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, page 90.
Troubleshooting
Operating Condition
In spray mode
In spray mode
In spray mode
Cause/Solution
Clean reservoir fluid filters. See Care
of the System, page 75.
Check low pressure sensor connec-
tions. See Service, page 90.
Check the low pressure setting. Ad-
just the setting to a normal pressure
for the material being pumped. See
Setup, page 56, to determine the
pressure alarm levels.
Check low pressure sensors. See
below.
Replace circuit board. See Service,
page 86.
Check that low pressure sensor op-
tion is selected. See Setup, page 44.
Check the low pressure setting. Ad-
just the setting to a normal pressure
for the material being pumped. See
Setup, page 56, to determine the
pressure alarm levels.
Inspect and clean sensor port.
Check low pressure sensors. See
below.
Replace circuit board. See Service,
page 86.
Inspect and clean sensor port. See
Service, page 90.
Check low pressure sensor. See
below.
Replace circuit board. See Service,
page 86.
Check low pressure sensor connec-
tions. See Service, page 90.
Check low pressure sensors. See
below.
Replace circuit board. See Service,
page 86.
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, page 90.