Qda1 Qda2 Qda3 - Graco ProMix 2KE Operation

Alarm and Description
QDA1, QDA2, QDA3
Overdose A
The A dose has overshot and,
when combined with B, is too
large for the mix manifold
capacity.
QDB1
Overdose B
The B dose has overshot, forc-
ing an A dose that, when com-
bined with B, is too large for
the mix manifold capacity.
3A0869C
Cause
Valve seal or needle/seat are leaking.
Flow meter fluctuations caused by pres-
sure pulsations.
Slow actuation of component A or B
valves.
Running a high mix ratio and a high flow
rate.
Solution
Repair the 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 2KE is reading
any fluid flow.
4. If the ProMix 2KE shows there is
fluid flow and there are no leaks
from the gun or any other seals or
fittings, the flow meters are probably
being affected by pressure pulsa-
tions.
5. Close the fluid shutoff valve
between the fluid supply system
and the flow meter. The flow indica-
tion should stop.
6. If necessary, install pressure regu-
lators or a surge tank on the fluid
inlets to the ProMix 2KE to reduce
the fluid supply pressure. Contact
your Graco distributor for informa-
tion.
See Ratio Low Error and Ratio High
Error, pages 57-58.
It may be necessary to restrict the flow
rate through the component B dose
valve by adjusting its hex nut.
System Errors
59