Ransburg DynaFlow User Manual - Manual (Page 36)

LN-9400-00.9
Flow Tolerance Percentage
This is a number (in percent) that indicates how
much deviation above and below the set point is
acceptable. Increasing this number will reduce
nuisance faults, but may lead to inaccurate fluid
metering if set too high.
This number is a percent of the specified mix ratio
for each of the 2 materials that is allowed to occur
before the system faults with an OUT OF TOLER-
ANCE fault. This is only updated after the volume
of material, as set by the Tolerance Volume, has
passed through the GUN. The accumulated flow
volume is reset to 0 upon the application of each
RUN command.
Tolerance Volume
This parameter has no effect on single-component
GUNs and only effects GUNs configured for two-
component operation.
This is the volume over which the ratio accuracy
is checked. Every time the volume of Master
CHANNEL fluid specified in this parameter has
flowed, the ratio is checked. The default value is
150 cc’s of the Master CHANNEL. This param-
eter should never be set so low that less than 10
cc’s of the slave channel has flowed. If this value
is set too low, nuisance OUT OF TOLERANCE
faults will occur.
The first time a gun is triggered after being placed
in Run mode, the Tolerance Volume is 150% of
the value entered in the job.
Mixed Volume
The amount of mixed material present in the mix
tube, fluid lines, and spray GUN combined. The
fluid in the spray GUN is always the material
that has been mixed the longest. The processor
keeps track of how long this material has been
mixed (Pot-Life Timer), and therefore needs to
know the volume from the mix tube to the spray
GUN. To determine the amount of mixed material
in the system:
1. Measure the volume of the mixing block.
2. Measure the volume of the spray GUN.
3. Measure total hose length and inside diameter.
4. Use the following formula to calculate hose
volume.
5. Add 10% to calculated value.
Volume = d 2 x L x 12.87
Volume = Volume in cc’s
d = Inside diameter of hose
L = Length of the fluid line from the flow
meter to the spray GUN in inches
It is best to over-estimate the amount of mixed
material rather than to under-estimate it!
The DynaFlow system uses the Mixed Volume and
the Pot-Life Time when it monitors the flow rate of
the Gun. Pot-Life is monitored by dividing the Mixed
Volume into 40 equal sized 'buckets' of material.
When an amount of material has flowed that equals
the 'bucket' volume, the 40 'buckets' are time-shifted
so the oldest 'bucket' is eliminated, representing
the material that has vacated the Mixed Volume
tubing at the GUN, and a new 'bucket' is added.
If the GUN is in either Run or Load mode, a time
value of 1 second is placed in the new 'bucket' to
represent mixed material. If the GUN is in Clean
mode, a time value of zero is placed in the new
'bucket' representing solvent. Every second, the
time values stored in the 'buckets' are incremented
if they are non-zero (i.e. contain mixed material vs.
solvent). A Pot-Life alarm condition
exists if any of the 40 'buckets' contains a time
value greater than the Pot-Life Time (see JOB
parameters). A Pot-Life alarm may be cleared by
entering a Pot-Life Time of zero seconds.
Flush Volume
This parameter is programmed in cc's. It is the
volume of flush solvent or flush solvent/air mixture
required to give an adequate flush of the fluid lines
for the gun. It is used by the software to determine
when an adequate flush has occurred.
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