WEIGH SCALE BLENDER® - Maguire Products

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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
WEIGH SCALE BLENDER® MAGUIRE PRODUCTS, INC. 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 cause some movement and DOES result in a minimum dispense. Add 5 to this time period and enter as the lag time. Lag times that are too short can cause problems. That is why the MINIMUM lag time determined above should be increased by 5 as a safety factor. These numbers are preset at the factory for the equipment we have supplied. When a dispense of only a few grams is required, the _LA number is very important. Too small a lag time will result in no dispense at all because of inadequate time for the device to operate. Too large a number may result in over dispenses when very small amounts are called for. Since too small a number may stall the process, always add 5 to the minimum as a safety. Typical LAG TIMES are: (minimum time plus five) 15 - for an AC motor being powered through a relay. 10 - for a 1" air cylinder sliding a dispense valve. 127 - for a MAGUIRE automatic speed controller. _PO For Micro Pulse devices only _PO sets the ON and OFF time of the specified device during the time period that the device is operated. This results in a "pulsed' output. This is used in combination with a "micro pulse" equipped slide gate. Set to 00000 for normal operation. Set to 00101 for pulsed operation. The first three digits (001xx) controls ON time in tenths of seconds. The last two digits (xxx01) controls OFF time. Larger numbers produce slower dispense rates without any increase in accuracy. Smaller numbers may not allow enough time for the slide to shift fully. Pulsed Output may also assist in dispensing regrind and some powders when these materials tend to bridge. A parameter of 00501 will produce a 1/2 second open time (5/10 seconds), a long enough time to allow a significant dispense, followed by a 1/10 second close time, just enough to close the gate fully. The rapid gate movement may help in keeping material flowing. For the KEYSTROKE SEQUENCE to change PARAMETERS, see the last page of the PARAMETER section. Edition: March 24, 2008 75
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