Decimal Places, Scaling, Characteristic Distance | Emerson FM-3

Setting Up Parameters

Decimal Places

The number of decimal places set in this parameter determines the number of digits after the decimal point used in all distance and position parameters throughout the software. Using a high number of decimal places will improve position resolution, but will also limit the range of absolute position. You can select from zero to six decimal places of accuracy.

Note

When the number of decimal places are changed in an existing configuration file the Index accel and decel parameters need to be checked.

Scaling

A Characteristic Distance and Length must be established to allow the FM-3 module to scale user units back to actual motor revolutions. This scaling factor is as follows:

Characteristic Distance

Scaling = -------------------------------------------------------

Characteristic Length

Characteristic Distance

This is the distance the load travels (in user units) when the motor travels the characteristic length (in motor revolutions).

Characteristic Length

This is the distance the motor travels (in whole number of revolutions) to achieve one characteristic distance of load travel.

Distance Scaling Examples:

A 1.5" diameter pulley is used to drive a conveyor belt, and the user wishes to use units of inches instead of revolutions.

Units Name — Set to Inches

Decimal Places — Set to desired accuracy 0.000

In one revolution of the motor (or pulley), the belt will travel a distance of one pulley circumference.

=1.5" x π

=1.5 x 3.14...

=4.712 inches / revolution

Characteristic Distance = 4.712

Scaling = ---------------------------------------------------------------------------

Characteristic Length = 1

39

Image 53

Emerson FM-3 manual Decimal Places, Characteristic Distance, Characteristic Length, Distance Scaling Examples

Contents

Reference Manual Page FM-3 Page 952 Customer SupportWebsite and Email Technical Support 952 995-8033 or 800 Customer Service Sales 952 995-8000 or 800 Training Services 952 995-8000 or 800Document Conventions Application Engineering 952 995-8000 or 800 This Represents EN EN Only Reference Materials Safety InstructionsGeneral Warning Qualified Person Setup, Commissioning and Maintenance Safety PrecautionsSafety of Machinery Enclosure Viii Table of Contents Tuning Procedures Parameter Descriptions 143 Installation 183Programming 115 Quick Start Glossary 265 Index 273 Diagnostics and Troubleshooting 225Specifications 249 Xii Introduction FM-3 Programming Module Reference Manual Software Interface PowerTools Pro Setup SoftwareFeatures Hierarchy View Keypad Interface Operational Overview PBus Group Parameter Screens How Jogging Works How Motion Works How Home Works Establishing a Home Reference Position Home Sequence Marker Sensor Sensor and Marker Accuracy and Repeatability Home Offset Calculated Home Offset, Peak Velocity Not Reached Specified Home Offset, Greater than Calculated Offset End of Home Position Example 1 Linear Application Home ExamplesHome Limit Distance Sensor Home Sequence Home Sensor and Marker then Offset, Example Example 2 Rotary Application Index Motion Sequence How Indexes Work Indexes View Absolute Index Absolute vs. IncrementalAbsolute Indexes Incremental Index Incremental Indexes Rotary Plus and Rotary Minus Indexes Indexes with Rotary Rollover EnabledRegistration Index Downloading How Communications WorkUploading Downloading NVM Options for Uploading and DownloadingUploading Updating to RAM Download Section Options/Preferences/Ptools Operation Upload Section Upload Non-Volatile Memory NVM Section Secure Downloading Brake Operation Brake Disengaged Brake ReleaseBrake Activate Identification Group Setup View Drive Encoder Output Group Configuration Group Positive Direction Group Update Rate Group Status Online Tab Online Only Switching Frequency Group Control Loop Group Motor Position GroupMotor Velocity Group Torque Group Master Feedback Group Module Information Group Information Tab Online OnlyDrive Information Group Units Name User Units ViewDistance Group Characteristic Length Characteristic DistanceDecimal Places Scaling Velocity Group Enable Separate Distance Units Check BoxScaled Distance Name Velocity Distance Units Scale Factor Separate Distance Units Example Acceleration GroupTime Scale List Box Master Units View Master Units View Master Position Setup Group Encoder Setup Group Master Acceleration Units Master Distance UnitsMaster Velocity Units Samples Enable Check BoxMaster Position Filter Position View Settings GroupEnable Feedforward Check Box Limits Group Software Travel Limits Rotary GroupSoftware Travel Limit + Software Travel Limit Online Tab not shown FeedRate Override Velocity View Examples FeedRate Decel/Accel Acceleration Type Ramps View Stop Deceleration Ramps GroupFeedhold Decel/Accel Travel Limit Decel Torque Level Torque View Torque Limit Peak TorqueOnline Status Tab Inertia Ratio Tuning ViewLoad Group Low Pass Filter Group Tuning GroupPosition Error Integral Group Time Constant Active Faults Window Faults ViewActive Faults Group Power Up Count Power Up GroupPower Up Time Total Power Up PLS View PLS View Source Number of PLS PointsOn Point Off Point Rollover Point Rotary Enable Setup NVM View Setup NVM View Decimal User Variables ViewName Adding and Deleting Variables Using Variables in a ProgramOnline Tab not shown Initial Value User Bits View Adding and Deleting User Bits Bit Mask Result stored in each bit User 32-bit Bit Register and User Bit Masking User Bits Read/Write Process Configuring the User Bit Mask Register User Bits Mask View Assignments View Setup GroupAssignments Assignments View Creating An Assignment Drag and Drop Method Deleting An AssignmentAssign Button Method Delete Button Method Tying a Source to a Destination Assignment Polarity Only Show Assigned User LevelAssignments that Automatically Use Position Capture Polarity Button Method Destinations that use captured data Selector View Selector View Assignment View Example Debounce Input Lines View Names Output Lines View Decimal Analog Inputs ViewUser Units Bandwidth Read Max/Min Voltage SettingsMaximum Value Maximum Voltage Motion Group Jog Number Jog ViewJog Name Time Base Jog Velocity Jog Sources and DestinationsJog Acceleration Jog Deceleration Jog.#.Decelerating DestinationsJog.PlusActivate Jog.MinusActivate Jog Select Details FM-3 Programming Module Reference Manual Home Reference Home ViewHome Number Acceleration VelocityDeceleration If on sensor... Group Specified Offset Radio Button LimitDistEnableLimit Distance Home Sources and Destinations Home.#.SensorTrigger Home.#.Initiate Index Number Index View Distance/Position Index NameIndexType Timed Indexes Time Checkbox Enabled Timed Index Profiles Enable Index PLS PLS Off Point PLS On Point Registration Parameters Index.#.Accelerating Index.AnyCommandCompleteIndex Sources and Destinations Index.#.Command In Progress Index.#.Command CompleteIndex.#.AtVel Index.#.Decelerating Toolbar Icon Method PowerTools Menu Bar MethodAdding and Deleting Indexes Deleting an Index Right Click Method Gearing View 108 Stopping Gearing Motion Initiating Gearing Motion Motion Stop from a Program Stopping MotionMotionStop for an Assignment Example Program 0 Running on Task Modbus View Network Group 112 Ethernet View DeviceNet ViewProfibus View FM-3 Programming Module Reference Manual 114 Programming Program Toolbar Icons Previous Book Mark Next Book MarkDelete All Book Marks Red Dot Help Disable Error Check Program Where Am I?Drag In Variables Lock Program Program Instruction Types ProgramsProgram Flow Instructions If/Then/Endif For Count/Next Else Wait For Do While/Loop Call Program Wait For Time Formula End Label BitBit Or Dwell For Time Motion InstructionsGoTo Index.Initiate Dwell for Master Dist Complex Velocity Profile Index.CompoundInitiate Index Velocity Profile with Drive Outputs Home.Initiate Jog.MinusInitiate Jog.StopJog.PlusInitiate Motion Modifiers Using LastGear Stop Gear.Initiate Adding and Deleting Programs PowerTools Menu Bar MethodToolbar Icon Method Adding a Program Deleting a Program Run Anytime ProgramsRight Click Method 133 Example Programs Resetting Faults in Run Anytime ProgramsOut and Return Simple Out and Return More Complex Elevator Accumulator with 100 Stop Positions Flying Cutoff/Shear Simple Jogging within a ProgramRotary Table with Calibrated Stop Positions Synchronized Jog with Manual Phase Adjustment Auger Filler with Inputs to Adjust the Fill Amount Learn Program Program Sequence Learn and Playback 140 141 FM-3 Programming Module Reference Manual 142 AccelType AbsolutePositionValidAccelerating AtVel AccelUnits.DecimalAccelUnits.TimeScale CommandingMotion ClearFollowingErrorBrake.Activate Brake.Disengaged DistUnits.CharacteristicLength DistUnits.CharacteristicDistDecelerating DefineHome DistUnits.Decimal DriveEnableStatusDistUnits.Name DriveAmbientTemp DriveInput.#.DebounceTime DriveInput.#.ForceEnableDriveInput.#.Force DriveInput.#.Name DriveOutputEncoder.ScalingEnable DriveOutput.#.ForceEnableFault.DriveFaultsBitmap DriveOutput.#.Name Fault.ModuleFaultsBitmap Fault.DriveOKFault.Faulted Fault.#.Active Fault.ResetFault.#.Counts FeedforwardsEnable FeedRateDeactivate FeedholdDecelTimeFeedRateOverride FoldbackActive FollowingErrorEnable FollowingErrorFollowingErrorLimit FoldbackRMS Gear.CommandInProgrees Gear.CommandCompleteGear.Activate Gear.AtVel Home.#.Accel Home.AnyCommandComplete Home.#.CommandInProgress Home.#.CommandCompleteHome.#.Accelerating Home.#.AtVel Home.#.Decelerating Home.#.LimitDistEnableHome.#.EndPosn Home.#.Initiate Home.#.OnSensorAction Home.#.OffsetTypeHome.#.Reference Home.#.SensorTrigger Index.ResetProfileLimited Index.AnyCommandCompleteHome.#.TimeBase Home.#.Vel Index.#.Accel Index.#.CommandCompleteIndex.#.Accelerating Index.#.AnalogLimitType Index.#.CompoundInitiate Index.#.CommandInProgressIndex.#.Decel Index.#.Decelerating Index.#.Initiate Index.#.PLSEnableIndex.#.LimitDistHit Index.#.Name Index.#.PLSStatus Index.#.RegistrationWindowEnableIndex.#.RegistrationOffset Index.#.RegistrationType Index.#.SensorTrigger Index.#.TimedIndexEnableIndex.#.TimeBase Index.#.Vel InPosn Jog.AnyCommandCompleteInPosnTime InPosnWindow Jog.Select0 Jog.#.CommandCompleteJog.Stop Jog.#.Accel Jog.#.Decel Jog.#.CommandInProgressJog.#.Decelerating Jog.#.MinusInitiate LineVoltage ModuleInput.#.ForceEnableModbus.BaudRate Modbus.ModbusId ModuleInput.#.Name ModuleOutput.#.ForceEnableModuleInput.#.Raw ModuleInput.#.Status MotorType MotionStopName PLS.#.Direction PLS.#.PLSEnable PLS EnablePLS Rollover Enable PLS.#.RotaryRolloverEnable PosnErrorIntegralEnable PosnCommandPLS.#.RotaryRolloverPosn PLS.#.Source PowerStageEnabled PosnErrorIntegralTimeConstantPowerUpCount PowerUpTime RotaryRolloverEnable PowerUpTimeTotalProgram.AnyComplete Program.#.Initiate Selector.SelectLinesUsed ShuntPowerRMSSelector.#.Select Selector.#.Selection SoftwareTravelLimitMinusActive SoftwareTravelLimitEnableSoftwareTravelLimitMinusPosn SoftwareTravelLimitPlusActive TorqueCommandLimited TorqueCommandStartUp Stop TorqueLevel TravelLimitDisableTorqueLevelActive TorqueLimit TravelLimitMinusActivate TorqueLimitEnableTravelLimitMinusActive TravelLimitPlusActivate TorqueUnits.PercentContinuousCurrent VelCommandTorqueUnits.Torque Var.Var#.Decimal VelocityUnits.DistVelScale VelocityUnits.DecimalVelocityUnits.Name VelocityUnits.ScalingFlag FM-3 Programming Module Reference Manual 182 Mechanical Installation Basic Installation Notes Grip the FM On each side LCD Modbus Communications PC System Configuration Software InstallationPreparing for PowerTools Pro Installation Installing PowerTools Pro Starting the Software Starting and Exiting PowerToolsIf You Need Help with Installation To display Help in PowerTools, do one of the following Accessing HelpOpening a New File Exiting the Software 188 Opening a New Configuration Window Basic Setup StepsEnter All Setup Data General Setup View 190 User Units View Position View Master Units View Ramps View Velocity View Torque View Tuning View PLS View Making Assignments 196 Jog Setup Setting Up Motion Parameters Home Setup Home Setup View Index Setup 200 201 Creating a Program 203 204 Example System Example Application Start Up Enable Following Error Enable this checkbox Making Assignments 208 209 210 211 212 PID vs. State-Space Tuning Procedures Tuning steps Tuning ProcedureInitial settings Fully Optimized Level General Tuning Hints Friction Tuning ParametersInertia Ratio Feedforwards Response Line Voltage EN Only Determining Tuning Parameter Values Procedure for Determining Friction Initial Test SettingsDetermining Friction Consider the following before determining the Friction Rpmh Rpml Determining Inertia Ratio Consider the following before determining the inertia Inertia Measurement Procedure Conversion Formula Ramp Units Conversion 223 FM-3 Programming Module Reference Manual 224 Diagnostic Display Diagnostics and Troubleshooting Fault Codes 227 Watchdog Timer Fault DescriptionsPower Up Test Flash Invalid Invalid Configuration FM-3 FaultPower Module High DC Bus Max Following Error RMS Shunt PowerEncoder State Encoder Hardware FM-3 Specific Fault Descriptions Traj Flt Isr OvrDrv Syn Watchdg DvOvrTmp Mtr TmpInv Parm Inv NVM Pwr On FlwErr Analog Outputs Analog Output Scale units Diagnostic Output Test Points Diagnostic Analog Output Test Points 237 Error Messages Drive FaultsResetting Faults Viewing Active Drive Faults Error The maximum limit of Instances is reached Non-Programming Error Messages Error Your Application is not valid to download Programming Error MessagesError a FM3 number’s mantissa must be between -2147483647 FYI Your Application has Error Couldnt find named Variable Error Can only compare,,etc numeric resultsError Couldnt find named Variable from Text Error Program Instance does not Exist Error Text Strings are limited to 12 characters Error Syntax error encounteredError The destination variable does not accept Data Error The destination variable is Read Only 243 Error This is not a fully qualified variable Error This instance does not existError This variable cannot be assigned a selection value Error This variable type cannot be assigned a value Watch Window Online Status Indicators 246 Motion Status Global Where Am I Button FM-3 Programming Module Reference Manual 248 Dimensions and Clearances Specifications 250 Cable Diagrams SNCE-XXX Cable SNCDD-001.5 Cable SNCO-003 Cable SNCI-003 Cable SNCLI-003 Cable CMDX-XXX Cable CMDO-XXX Cable CDRO-XXX Cable TIA-XXX Cable DDS-XXX Cable TERM-H Head Terminator TERM-T Tail Terminator CMDS-XXX Cable CMMS-XXX Cable CFCS-XXX Cable CFCO-XXX Cable CFOS-XXX Cable FM-3 Programming Module Reference Manual 264 Axis AmplifierBaud Rate Check Box Destination ConfigurationDialog Box DIN Rail Firmware Global Where AmFlash Flash File Input Line Input FunctionJog Least Significant Bit Opto-isolated Option ButtonOutput Function Output Line Radio Button PowerTools ProSerial Port Travel Limit Windows, Microsoft VariableView FM-3 Programming Module Reference Manual 272 Index Symbols 274 275 FM-3 Programming Module Reference Manual 276