Alarm Troubleshooting

Table 17. Alarm Troubleshooting

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

 

Solution

 

 

Valve seal or needle/seat are leaking. Check FIG. 17

Repair the valve (see valve manual 312782).

Totals Screen on page 26. If A and B are dosing simul-

 

 

taneously (sequential dosing only), there is a leak.

 

 

 

 

Sampling valve is leaking.

Tighten or replace valve.

 

 

Flow meter fluctuations caused by pressure pulsations.

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.

 

 

Slow actuation of component A or B valves.

See E-3: RATIO HIGH ALARM and E-4: RATIO LOW

 

ALARM, pages 117-118.

 

 

Running a high mix ratio and a high flow rate.

It may be necessary to restrict the flow rate through the

 

component B dose valve by adjusting its hex nut (E). See

 

page 88.

 

 

 

312779E

119

Page 119
Image 119
Graco TI12553a, TI12552a Overdose B/A Dose TOO Short Alarm, See E-3 Ratio High Alarm and E-4 Ratio LOW

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