Troubleshooting; Common Problems - Graco HFR Setup And Operation

Troubleshooting

Before performing any troubleshooting procedure:
1. Perform Pressure Relief Procedure on page 66.

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
A (Red) and B (Blue) Primary Heaters
Control of primary heat is
abnormal; high temperature
overshoots
Hose Heat System
Hose heats but heats slower
than usual or it does not
reach temperature
313997A
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
Dirty RTD connection
RTD not contacting heater element
Failed heater element
Signal failure from RTD
RTD wired incorrectly
Ambient temperature is too cold
FTS failed or not installed correctly
Low supply voltage
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 assum-
ing there is a problem.
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 3 point calibration
Remove check valve; clean or replace as necessary
Replace Piston
Examine connection of RTD to long green plug on
heater control board. Unplug and re-plug RTD wires,
cleaning off any debris. Unplug and re-plug long
green connector.
Loosen ferrule nut, push in RTD so tip contact heater
element. Holding RTD tip against heater element,
tighten ferrule nut 1/4 turn past tight.
Replace
Check connections
Check connections. Power up zones one at a time
and verify that temperature for each zone rises.
Use auxiliary hose system.
Check FTS
Verify line voltage. Low line voltage significantly
reduces power available to hose heat system, affect-
ing longer hose lengths.
Troubleshooting
75