WEIGH SCALE BLENDER® - Maguire Products

WEIGH SCALE BLENDER®
MAGUIRE PRODUCTS, INC.
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.
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.
_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
Edition: March 24, 2008 74