veeder-root - Danaher Specialty Products

INTRODUCTIONElectronic Predetermining Counters2ELECTRONICPREDETERMININGPredetermining counters (or preset counters) are essentially totalizersthat can switch an external circuit when its counted total matches auser-entered preset limit. They can be used in manufacturing andprocess applications to control batch lot size, cutting material to length,punching or drilling, and many other count, position, or length relatedoperations.CutterActuatorCUT-TO-LENGTHEncoderEncoderSlowStopLOCATINGMotorLCD DisplayLED DisplayEncoderDISPLAY TYPESBATCHINGMotorBatchWINDING/SPOOLINGTo MotorPREDETERMINING COUNTER APPLICATIONSOur brand names, VEEDER-ROOT and DYNAPAR, are recognizedworldwide for innovative designs, quality, durability, and accuracy – andare backed by over 120 years experience in development andapplication of counting and controlling instruments. This expertise hasled to a product range that spans all counting technologies –mechanical, electric, and electronic.Electronic predetermining counters bring the advantages of moderndigital displays, high counting speeds, multiple presets, silent operation,and long life. Our general purpose types are comparably priced to othertechnologies and are very easy to install and use. An important,powerful feature provided by electronic designs is the automatic resetfunction. The counter is instantly recycled when its output occurs –permitting control of repetitive operations without human intervention.The electronic predetermining counter’s high speed and compatibilitywith a variety of sensors makes them ideal for length-cutting,positioning, or liquid/gas flow applications that demand precise,repeatable control.For your most challenging applications, consider our state-of-the-artprogrammable counters. They offer maximum flexibility through userselected advanced features such as: input calibrators, movable decimalpoint, bidirectional counting modes, and output logic options.In some applications they may actually replace two or more individualcounters – providing cost effective, customized solutions to yourcounting and controlling problems.DISPLAY TYPESLiquid Crystal Displays (LCD) are best suited for installation in areaswhere there is reasonably good lighting and are superior to most otherdisplay types when viewed in very bright ambient light; such as directsunlight. They may be difficult to view in very dimly lit areas, but somecounters overcome this problem through use of an internal light source.Light Emitting Diode (LED) displays, since they produce their own light,can be viewed in very dimly lit areas – even in the dark. Their highcontrast presentation makes them the preferred type when the displaymust be observed from a distance. Our Series C628 "AWESOME"products feature display color change at alarm presets.SPECIFYING A PREDETERMINING COUNTERBasic considerations when selecting a predetermining counter for yourapplication are:■ Input – What is to be counted and from where will the counter’s inputbe obtained?■ Count Speed – Speed ratings vary. Check Specifications.■ Number of Digits – Based on Maximum Count Value■ Type and Size of Display – Should accommodate operatingenvironment’s viewing and lighting conditions■ Packaging – Mounting requirements and Enclosure Size■ Environmental – Temperature SpecificationAdditional selection criteria for predetermining counters include:■ Number of Preset Limits:Electronic preset counters are availablewith one, two, or more preset limits. Each preset limit can detect aspecific count value and actuate its own independent output.Although simple single limit types will suffice for many applications,there are times when additional preset limits can greatly enhance theoperation of a machine or process. For example, a two limit electroniccounter can be used for cutting material to a length controlled by itsfirst preset, while a second preset is used as a “prewarn” that reducesthe machine’s speed prior to making the cut – permitting increasedaccuracy.■ Output Device: Most predetermining counters include internalcontacts that can switch a wide voltage range of AC or DC circuitsthat draw moderate power. The relay is capable of directly controllingsolenoids, valves, shears, lights, buzzers, etc.Some electronic types provide a transistor output. These are capableof switching low power DC loads only. They are ideal for directconnection to solid-state devices such as programmable logiccontrollers. Transistor output devices provide the advantages ofreliability and fast switching speed.■ Output Action: Many electronic predetermining counters incorporateuser selectable output action features. Our simplest types providechoice of a fixed duration momentary output or latched output. Ourprogrammable models have additional flexibility allowing customsetting of momentary output times, as well as logic functions that canenhance the counter’s contribution to the overall application.2.00VEEDER-ROOT • EAGLE SIGNAL • DYNAPAR