Graco Reactor H-25 Series Repair And Parts Manual page 12

Motor Control Diagnostic Codes
NOTE: E24 can be an alarm or a warning, as desired.
Set DIP switch on motor control board ON for alarm,
OFF for warning. See page 31.
Fast E24 Errors
Fast E24 errors occur:
• within 10 seconds of turning the pumps on, or
• as soon as you trigger the gun.
Causes of Fast E24 Errors:
• one side of the gun is plugged.
• a pressure transducer has failed.
• damaged pump seals or check valve.
• no feed pressure or empty material drum
• plugged heater.
• plugged hose.
• plugged manifold.
• one PRESSURE RELIEF/SPRAY valve is leaking or
is set to PRESSURE RELIEF/CIRCULATION
Checks for Fast E24 Errors
NOTE: If a fast E24 error occurs, first check the
readings of the analog gauges.
If the gauge readings are very close:
1. Clear the error (page 11) and try running the unit
again.
2. If E24 recurs and the gauge readings are still very
close, a pressure transducer has failed.
The digital display always shows the higher of the
two pressures. As soon as the higher analog
pressure drops below the lower analog pressure,
the display changes to the new higher reading.
Knowing this, the following checks will show which
transducer has failed, or if the motor control board
has failed.
3. For testing purposes only, set DIP switch 2 on the
motor control board to OFF. See Motor Control
Board, page 31. This will allow the Reactor to
continue to run with a pressure imbalance.
c. Run the unit until pressure is 1000-1500 psi
(7-10.5 MPa, 70-105 bar). Shut down the unit,
clear the alarm, and power back up, but do not
depressurize the unit.
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d. Check the analog gauges to see which pressure
is higher, and check if the display matches.
If the higher gauge and display match, that
transducer is communicating with the motor
control board. Continue with step e.
If the higher gauge and display do not
match, that transducer is not communicating
with the motor control board. Check wire
connections and replace transducer, page 33.
e. Turn pumps off. Reduce pressure of higher
component by slightly turning PRESSURE
RELIEF/SPRAY valve for that component
toward PRESSURE RELIEF/CIRCULATION
, while watching the display and the analog
gauges. As soon as the higher analog pressure
drops below the lower analog pressure, the dis-
play should change to the new higher reading.
Continue reducing the original higher pressure
.
an additional 200 psi (1.4 MPa, 14 bar); digital
display should stop dropping.
f. Repeat for the other side, to check the other
transducer.
4. To test if the failure is with the transducer or the
socket on the motor control board:
a. Reverse connections at J3 and J8 on the motor
control board.
b. Run the unit until pressure is 1000-1500 psi
(7-10.5 MPa, 70-105 bar).
c. If the problem stays on the same side as before,
replace the motor control board. If the problem
appears to move to the other side, replace the
transducer.
Turn valve slightly
1
to reduce pressure
of higher
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