Troubleshooting; Light Tower (Optional); Common Problems - Graco VRM Instructions Manual

Hydraulic, plural-component, variable-ratio proportioner
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Troubleshooting

Troubleshooting
For information about ADM error and event codes see
Appendix D - ADM Event and Error Codes Overview,
page 60.
Before performing any troubleshooting procedure:
1. Perform Pressure Relief Procedure on page 35.
2. Turn Main Power Switch to the OFF position.
3. Allow equipment to cool.
Try the recommended solutions in the order given for
each problem to avoid unnecessary repairs. Also, deter-
mine that all circuit breakers, switches, and controls 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
40
Cause
No power
Thrown circuit 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 yellow
light can be on at the same time as red (flashing or solid
on) when an advisory exists at the same time as a devi-
ation or alarm.
Solution
Verify main power switch is ON
Check machine 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, see
pump manual for instructions and rebuild kit
Perform calibration procedure
Remove check valve; clean or replace as necessary
Replace piston
1.
Observe gauges to determine which pump is los-
ing pressure.
2.
Determine in which direction the pump has
stalled by observing which directional valve indi-
cator light is on.
3.
Repair the valve.
313873C

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