Baldor MN1903 installation manual Selecting a scale

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5.3.3 Selecting a scale

MintMT defines all positional and speed related motion keywords in terms of encoder quadrature counts (for servo motors) or steps for stepper motors. The number of quadrature counts (or steps) is divided by the SCALE factor allowing you to use units more suitable for your application. The unit defined by setting a value for scale is called the user unit (uu).

Consider a motor with a 1000 line encoder. This provides 4000 quadrature counts for each revolution. If SCALE is not set, a MintMT command that involves distance, speed, or acceleration may need to use a large number to specify a significant move. For example MOVER=16000 (Move Relative) would rotate the motor by 16000 quadrature counts - only four revolutions. By setting a SCALE factor of 4000, the user unit becomes revolutions. The more understandable command MOVER=4 could now be used to move the motor four revolutions.

In applications involving linear motion a suitable value for SCALE would allow commands to express values in linear distance, for example inches, feet or millimetres.

1.In the Toolbox, click Setup, then click the Parameters icon.

2.Click the Scale tab.

3.Click in the Axis drop down box to select the axis. Each axis can have a different scale if required.

4.Click in the Scale box and type a value.

5.Click Apply.

This immediately sets the scaling factor for the selected axis which will remain in the NextMove PCI until another scale is defined or power is removed from the NextMove PCI.

MN1903

Operation 5-9

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Contents NextMove PCI Motion Controller Page Contents Operation Appendices Iv Contents MN1903 General Information Precautions Safety NoticeMN1903 Introduction NextMove PCI featuresIntroduction MN1903 Catalog number PCI001 InstalledReceiving and inspection Identifying the catalog numberUnits and abbreviations PhaseTools and miscellaneous hardware Other information needed for installationIntroduction Hardware requirementsLocation requirements NextMove PCI Expansion card and can Bracket board InstallationThis completes the basic installation Installing the NextMove PCI cardBasic Installation MN1903 Outline 100-pin edge connectorPin Signal 1 100-pin connector pin assignment100-pin connector pin assignment Analog I/O Analog inputs LocationPin Name MintMT keyword / description Analog input wiring, AIN0 shown Pin Name Description Analog outputs Drive Demand/CommandInput Common Breakout module connector Digital I/ODigital input arrangement Stepperio Pin Name MintMT keyword Common Description Digital inputsINX.4 Digital input circuit fast interrupts Digital outputs OUTX.0 Encoder interfaces X12, X13, X14, X15 Other I/OEncoder input frequency Power Relay connections Relay and can powerPin X10 Name X11 Name Description Stepper drive outputs X10Cable length Maximum bit Resistance Conductor Rate Area Can Connections1 CAN1 CANopen 2 CAN2 Baldor can Baldor proprietary can interface using a RJ45 connectorReset states Emulator connectionSystem watchdog Example minimum system wiring Connection summary minimum system wiringBreakout Pin Name Function This completes the input/output wiringModule Signal Connector Connector details for minimum system wiring shown in FigureInput / Output MN1903 Drivers\nmPCI\win9x Installing the driver software Windows 95, 98 and MEInstalling the driver software Windows Installing the driver software Windows NT\start Installing WorkBenchStarting WorkBench MN1903 Operation Operation MN1903 Help file WorkBenchConfiguring an axis Choosing an axis 1, 2, 3 and 4 axis cardsChoosing an axis 8 axis card Selecting a scale Setting the drive enable output Testing the drive enable output Testing the drive command output Servo axis testing and tuningAn introduction to closed loop control Summary, the following rules can be used as a guide NextMove PCI servo loop Selecting servo loop gains Servo axis tuning for current controlMN1903 Operation Underdamped response Underdamped responseOverdamped response Overdamped responseCritically damped ideal response Critically damped responseServo axis eliminating steady-state errors Calculating Kvelff Servo axis tuning for velocity controlKvelff Correct value of Kvelff Adjusting Kprop Correct value of Kprop JOG.0=2 Stepper axis testingDigital input configuration Digital input/output configurationDigital output configuration Saving setup information 10.1Loading saved information Operation MN1903 SupportMet feature Problem diagnosisStatus and can LEDs NextMove PCI indicatorsSymptom Check CommunicationMotor control Output polarity Mechanical specifications Digital inputs X1 Encoder interfaces X12 Relay outputStepper outputs X10 10CANopen interface11Baldor can interface NextMove PCI Expansion card NextMove PCI Expansion cardExpansion Expansion card Axis numbering when using expansion cardsMain Expansion cards With no One 4-axis One 8-axis Two 4-axisExpansion card status LEDs CBL021-503 NextMove PCI Breakout moduleCatalog number Description PCI003-501 CBL021-501Catalog Description Number OPT025-508 Digital output modulesNextMove PC system adapter SparesBaldor can nodes OPT029-501 NextMove PCI can Bracket boardEncoder Splitter/Buffer board Catalog Description Number OPT008-501Accessories MN1903