
9Installation & Programming Manual
Chapter3: Set-Up &Programming
Parameter5is onlyusedontwo axismodulesintowhich amulti-turndualresolver assemblyisbeing
wired. Amulti-turndualresolver assembly containstworesolversgearedtogether through a64:1or
128:1precisiongearreducer. One resolver providesfinepositiondataperturnof the inputshaftwhile
thecourseresolverkeepstrackofthenumberof turns. A zero in parameter 5 configuresthemodule
foroperationwitha64:1dualresolver assembly. Aone in parameter 5configuresthemoduleforuse
witha128:1dual resolverassembly.
Whenconfiguredforusewith a dualresolverassembly,thescalefactorsetinparameters 2 and3will
bethecountchangeover the total numberofturns.
Forexample,if the scale factor was 640 and theratiowas64:1,eachturnwouldbe10 counts. The
totalaccumulatedcountof a multi-turndualresolversystemis absolute andwillnotbelost onapower
failure. Also,anymovementofthemechanismwhilepoweris offwillbereflectedinthetotalposition
countwhenpowerisrestored.
Example: Parameter5(turnsratio) set for 1 (128 turns)
Parameters 2 and 3 (scale factor) set for 12,800
Parameter4 must be set tozero
Thepositioncountwillcount from 0 to 99 over the first rotation, 100 to 199 over the second,200to
299overthethirdandwill continue increasing by 100countsperturnuntil12,799isreached at the end
ofturn128. Thesystemwillrolloverto zeroandbegincountingup againiftheresolver continues
rotationinapositivedirection beyond 12,799. Reverserotationbelowzerowillresult in acountthat
jumpsto12,799andcontinuous counting backwards.
Thedefaultvaluesforthescalefactoris4096and the turns counting is set tozero(disabled). The
defaultsettingforthemulti-turnresolver is64:1. SaveConfigurationCommandwillsavethese valuesto
EEPROM.
NOTE: Whenthescalefactoror turns count ischanged,alloffsetvalueswillbe reset to zero. This
includesthehomeposition andallreset-to-presetoffsets.
Command 3: Home Positioning Data
Thiscommandwillresettheposition oftheresolverindicatedtomatchactual machineposition.
Example: Withthemachinestoppedatthe“0”position, parameters 2 and 3 (Home
Position)mustbesetto“0”. Theparameters for this command have been
definedonnextpage:
NOTE: Thetotalaccumulatedcountwhenturnscountingisenabledisavolatilevalue.Thisnumber
willbelostonapowerfailure. Steps should be taken tosavethisvaluetoanonvolatile
integerfileintheSLCprocessor ifmaintainingpositiondataisimportantto your application.
TheSaveCommandcanalsobeusedto save the current position, therefore,notlosingthe
turnscount.
Spec Tech Industrial Electric
Spec Tech Industrial Electric