Graco ProMix 2KS Operation page 119

E-5: OVERDOSE A/B DOSE TOO SHORT ALARM and
E-6: OVERDOSE B/A DOSE TOO SHORT ALARM
E-5: the A dose overshoots and, when combined with B, is too large for the mix chamber capacity.
E-6: the B dose overshoots and forces an A side dose that, when combined with B, is too large for the mix chamber
capacity.
Cause
Valve seal or needle/seat are leaking. Check F
Totals Screen on page 26. If A and B are dosing simul-
taneously (sequential dosing only), there is a leak.
Sampling valve is leaking.
Flow meter fluctuations caused by pressure pulsations.
Slow actuation of component A or B valves.
Running a high mix ratio and a high flow rate.
312779E
Table 17. Alarm Troubleshooting
. 17 Repair the valve (see valve manual 312782).
IG
Tighten or replace valve.
Check for pressure pulsations:
1. Close all the manifold valves.
2. Turn on the circulating pumps and all the booth
equipment (such as fans and conveyors).
3. Check if the ProMix 2KS is reading any fluid flow.
4. If the ProMix 2KS shows there is fluid flow and there
are no leaks from the gun or any other seals or fit-
tings, the flow meters are probably being affected by
pressure pulsations.
5. Close the fluid shutoff valve between the fluid supply
system and the flow meter. The flow indication
should stop.
6. If necessary, install pressure regulators or a surge
tank on the fluid inlets to the ProMix 2KS to reduce
the fluid supply pressure. Contact your Graco distrib-
utor for information.
See E-3: RATIO HIGH ALARM and E-4: RATIO LOW
ALARM, pages 117-118.
It may be necessary to restrict the flow rate through the
component B dose valve by adjusting its hex nut (E). See
page 88.
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Alarm Troubleshooting
Solution
119