is required, the _LA number is very important. A lag time number that is too small will result in no dispense at all because of inadequate time for the device to operate. A lag time number that is too big may result in over dispenses when very small amounts are called for.
Since too small a number may stall the process, always add 2 to the minimum as a safety. As a further safety, the software automatically doubles the lag time number if a dispense occurs without any weight being detected.
Typical LAG TIMES are: (minimum plus five)
12- for an AC motor being powered through a relay.
20- for a 1" air cylinder sliding a dispense valve.
127- for an automatic speed controller.
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PRC (not necessary to ever change this)
PRC is the maximum allowable PERCENT rate change per cycle. If a large dispense error occurs, flow rate corrections do not exceed this percent number. This prevents large swings in timing of dispenses and provides for stable dispense rates under difficult conditions. For example, when dispense quantities are very small (one or two grams), overfeeding by several grams is a distinct possibility. This type of error represents a very large percentage error to the controller. However, a large correction would not be appropriate but, instead, would cause a "hunting" of dispense time that would result in further large errors. This parameter prevents this.
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STL (probably no need to ever change this)
STL is the TIME period allowed to pass after a dispense has occurred, but before a weight reading is taken. This settle time allows falling pellets to reach the bin and also prevents their impact with the bin from adding to the weight reading.
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LCL, LCH, LCF and LCZ
These four parameters are set to match the characteristics of the type of load cells used in your system. DO NOT ALTER THEM. LCL and LCH are the acceptable LOW and HIGH limits of load cell output expressed as pulses per gram of weight. LCF is the lowest acceptable FULL scale load cell output in raw signal pulses per second. LCZ is the highest acceptable ZERO scale output. The LCF and LCZ numbers stored here are multiplied by 256 before being used by the software.
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SCR Special Customer Request
If a customer has a special software requirement that has no benefit to anyone else, then this request is hidden in the software and activated by the appropriate code number being entered into this parameter. Believe me when I say that these request are useless to anyone else.
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BCR Use only for blenders with BAR CODE reader input.
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