Troubleshooting; Light Tower (Optional); Common Problems - Graco HFRL Setup And Operation Manual

Troubleshooting

Before performing any troubleshooting procedure:
1. Perform Pressure Relief Procedure on page 40.
2. Turn main power OFF.
3. Allow equipment to cool.
Try the recommended solutions in the order given for
each problem, to avoid unnecessary repairs. Also,
determine that all circuit breakers, switches, and con-
trols are properly set and wiring is correct before
assuming there is a problem.

Common Problems

Problem
General
Display Module completely
dark
No or incorrect amount of
material dispensed from
either side
Significant material leaking
from pump seal
Material dispensed not cor-
rect weight
Proportioning System
Proportioning pump does not
hold pressure when stalled
3A2175Z
Cause
No Power
Thrown Breaker
Loose Connection
Bad Display Module
Ball Valve closed (if Installed)
Tank Empty
Tank Clogged
Air In Material
Pump shaft worn and/or shaft seal
worn
Specific gravity of one or more of the
two materials has changed since cali-
bration
Check valve malfunction
Piston worn or broken
Pump piston or intake valve leaking

Light Tower (Optional)

Signal Description
Green on only System is powered up and there are
no error conditions present
Yellow on An advisory exists
Red flashing A deviation exists
Red on The system is shut down due to an
alarm occurring.
Errors include advisories, deviations, or alarms, so
green will only be on when none of these occur. A yel-
low light can be on at the same time as red (flashing or
solid on) when an advisory exists at the same time as a
deviation or alarm.
Solution
Verify AC Power switch is ON
Check Machines Breakers and Reset
Tighten 5-pin cable on Advanced Display Module
Replace Advanced Display Module
Open tank ball valve.
Add fluid
Clean tank
Prime the machine
Remove pump shaft assembly and reinstall read
pump rebuild kit
Run calibration
Remove check valve; clean or replace as necessary
Replace Piston
1. Observe gauges to determine which pump is
losing pressure.
2. Determine in which direction the pump has
stalled by observing which directional valve indi-
cator light is on.
3.
Repair the valve.
Troubleshooting
51