Alarm Troubleshooting
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ProMix™ II Alarms
54
310633C
Overdose (E5) Alarm
Cause
Solution
ProMix™ II detected that the sum of A and B doses was
too large for the integrator (greater than 65 cc). This can
be caused by:
•
Valve(s) packings or needle/seat are leaking.
•
Torque packings to 25 in-lbs (2.8 N•m) [see page
39], or service the valve [see Dispense Valve manual
310655]
•
Sampling valve is leaking.
•
Tighten or replace valve.
•
Flow meter fluctuations caused by pressure pulsa-
tions.
•
Check for pressure pulsations:
a.
Close all the manifold valves.
b.
Turn on the circulating pumps and all the booth
equipment (such as fans and conveyors).
c.
Check if the ProMix™ II is reading any fluid flow.
d.
If the ProMix™ II shows there is fluid flow and
there are no leaks from the gun or any other
packings or fittings, the flow meters are probably
being affected by pressure pulsations.
e.
Close the fluid shutoff valve between the fluid
supply system and the flow meter. The flow indi-
cation should stop.
f.
If necessary, install pressure regulators or a
surge tank on the fluid inlets to the ProMix™ II to
reduce the fluid supply pressure. Contact your
Graco distributor for information.
•
Slow actuation of component A or B valves.
•
See Ratio Alarm (E4), page 53, third cause.
•
Running a high mix ratio and a high flow rate.
•
It may be necessary to restrict the flow rate through
the component B dispense valve by adjusting its hex
nut (E). F
IG
. 41, page 39.
Dose Time A (E6) or B (E7) Alarm
Cause
Solution
If the air flow switch is on, but there is no fluid flow
through the meter for the component being dispensed for
40 seconds, a dose time alarm occurs and the dispense
valves turn off. This can be caused by:
See Air Flow Switch Function, page 11, for additional
information.
•
System being in Mix
mode and gun is only par-
tially triggered, allowing air, but no fluid, to pass
through the gun.
•
Do not partially trigger gun.
•
Fluid flow rate is too low.
•
Increase flow rate
•
Flow meter or cable failed or flow meter clogged.
•
Follow Meter Calibration procedure, page 49. If
there is a meter or cable failure, you will see a large
difference between the amount of fluid dispensed
and the flow meter volume displayed by the
EasyKey™ Display.