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Retries will occur until the difference between the required
amount and the metered amount is equal to or less than the _RP percent
difference AND the _RD weight difference.
These numbers dictate just how close to perfect the dispense has
to be before going on. If the dispense overshoots the target, then the
process continues. These parameters only control the degree of weight
SHORTAGE that is acceptable.
The _RP parameter is important when SMALL DISPENSE requests for
color or additive are made. Large PERCENT errors are more likely to
occur when very small dispenses are requested.
The _RD parameter is important when LARGE DISPENSE requests for
color or additive are made. Large GRAM weight errors are more likely
to occur when very large dispense percentages are being requested.
Depending on the accuracy of the metering device, a certain amount
of hunting is to be expected from one dispense to the next. Allowing
the software to stop trying when it gets sufficiently close to the
target results in more perfect average dispenses. The mix chamber and
the barrel of your process machine average out the small errors that
occur from cycle to cycle. If no shortage is ever to be allowed then
these parameters can be set to prevent any shortage from occurring.
This will, however, cause an overall error on the plus side.
NOTE: Remember that EITHER ONE of the two parameters listed here will
cause retries to occur. BOTH parameter conditions must be met
before the process will continue, with one exception: If the
ALARM parameter (_AL) is set to 00000, indicated that you do not
want the process to stop, then these two RETRY parameters will
have no effect. The first dispense will always be accepted and
no retries will be made.
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_LA (change if you change metering device)
_LA is the lag TIME before dumping actually starts. This lagtime
is the time it takes for the dispense system to mechanically respond to
the controller's signal to start. Lag time is automatically added to
all dispense times.
Changing the means by which a device is operated such as using a
different diameter air cylinder, or a different drive system for an
auger feeder may require a change in this parameter.
These parameters represent the number of interrupts (time) that
pass before the feeder or dispense system actually begins to dispense.
There are 244 interrupts per second. To determine these times, use the
TIME dispense function in the Manual mode (KEYPAD instructions).
Following the instructions given in the KEYPAD portion of the
manual (TIME key), start with a dispense time of 1 (001). Try
successively higher time numbers until some movement is noted in the
mechanical device and a minimum amount of material IS dispensed on each
try. This is the MINIMUM lag time number; the lowest number that DOES
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