Intelligent Motion Systems Motion Detector Motor Settings Screen PWM Current Control, PWM Mask

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Motor Settings Screen (PWM Current Control)

The Motor settings screen allows the user to fine tune the settings of the PWM to optimize the current output for a variety of stepping motors.

There are four parameters that may be set:

1.PWM Mask

2.PWM Period (Duty Cycle)

3.PWM Frequency Range

4.PWM Control

PWM Mask

PWM Period

 

(Duty Cycle)

PWM Frequency Range

Control Bits

Figure 2.6.13: Motor Settings Screen

PWM Mask

The PWM mask parameter prevents the premature end of the forward period caused by switching transients when the motor phase current is at low levels. Adjusting this value can impact the zero-crossing performance of the motor. If experiencing the “tick” which is inherit in stepper motor systems, this may be minimized or eliminated by adjusting this value. The range of this value is 0 to 255d and will be entered as a decimal value.

The Mask will act as a filter on the PWM signal to allow time for any ringing in the output circuitry to settle.

This range represents a 8-bit Hex value that specifies the Bridge Reverse Measure Time (REVTM) and the Minimum Bridge Forward On Time (FORTM) ranging from 600 nS to 3.4 µS each (see table and diagram below). Typically these values would be balanced. The table below shows the decimal value for each time.

Note that these are typical values and the currents may be unbalanced to fine tune the motor performance.

The default value for this parameter is 204 (0xCC), which represents a Reverse Measure Time and Minimum Forward On Time of 2.5 µS.

Reverse Measure Time/Minimum Forward On Time

Hex

Time

0x0

600 ns

0x1

700 ns

0x2

800 ns

0x3

900 ns

Hex

Time

0x4

1.0 µs

0x5

1.1 µs

0x6

1.2 µs

0x7

1.4 µs

Hex

Time

0x8

1.6 µs

0x9

1.8 µs

0xA

2.0 µs

0xB

2.2 µs

Hex

Time

0xC

2.5 µs

0xD

2.8 µs

0xE

3.1 µs

0xF

3.4 µs

Table 2.6.6: PWM Mask Settings

Reverse Measure Time

Min. Forward On Time

1

1

0

1

1

1

0

1

 

0xD (2.8 µS)

 

 

0xD (2.8 µS)

 

Convert to Decimal

0xDD

PWM Mask Value = 221

Figure 2.6.14: PWM Mask Bits

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Microstepping MForce PowerDrive Manual Revision R032008

Page 57 Page 59
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Page 57 Page 59
Contents Forcetm Microstepping MForce PowerDrive Product Manual Important information This page intentionally left blank Table Of Contents Appendices List of Figures List of Tables MForce PowerDrive Front Microstepping MForce PowerDriveStepping Motor Connecting the Motor Connect Opto Reference and Logic InputsForcetm Intentionally Left Blank Introduction to the Microstepping MForce PowerDrive ConfiguringFeatures and Benefits Microstepping MForce PowerDrive Detailed Specifications General SpecificationsSetup Parameters Mechanical Specifications Dimensions in Inches mmPin Assignment and Description Pin # Function DescriptionP3 Connector DC Power, 2-Pin Locking Wire Crimp P4 Connector MotorParameter Setup Cable and Adapters Options and AccessoriesPrototype Development Cable Intentionally Left Blank Forcetm Microstepping MForce PowerDrive Manual Revision R032008 Mounting and Connection Guidelines Mounting RecommendationsMounting Hole Pattern Securing Power Leads and Logic LeadsLayout and Interface Guidelines Logic and SPI Communications P1 Power P3Motor P4 Intentionally Left Blank Interfacing DC Power Choosing a Power Supply for Your MForce PowerDriveRecommended IMS Power Supplies DC Power Supply RecommendationsISP300-7 Unregulated Switching Supply IP804 Unregulated Linear SupplyRecommended Power and Cable Configurations Basic DC Power ConnectionExample a DC Power Cabling Under 50 Feet Transformer 10 to 28 VAC RMS for 48 VDC Systems Winding Inductance Motor Selection and InterfaceSelecting a Motor Types and Construction of Stepping MotorsLead Stepping Motor Parallel Configuration Recommended IMS MotorsFrame Enhanced 6.0A Frame Enhanced 2.4A Not Available with Double ShaftFrame Enhanced 3.0A Frame Enhanced 6.3APhase Connector Pin Lead MotorsPhase a Motor Connections MForce PowerDrive Phase OutputsRecommended Motor Cabling Example a Motor Cabling Less Than 50 FeetExample B Motor Cabling Greater Than 50 Feet Recommended Motor Cable AWG SizesMicrostepping MForce PowerDrive Manual Revision R032008 Enable Input Isolated Logic Input Pins and ConnectionsIsolated Logic Input Characteristics Logic Interface and ConnectionQuadrature Step ClockDirection Up/DownSTEP/DIRECTION Timing Optocoupler Reference Optocoupler ReferenceNPN Open Collector Interface Sinking Input Connection ExamplesSwitch Interface Sinking Switch Interface ExampleMinimum Required Connections +V +12 to +48Connecting SPI Communications SPI Pins and Connections Logic Level Shifting and Conditioning CircuitSPI Master with Multiple Microstepping MForce PowerDrive 4 SPI Master with a Single Microstepping MForce PowerDriveConfiguration Parameters and Ranges Using the IMS SPI Motor Interface InstallationColor Coded Parameter Values File IMS SPI Motor Interface Menu OptionsView Recall UpgradeHelp Msel Microstep Resolution Select Msel Microstep Resolution SelectionSet Connected/Disconnected IndicatorFactory ExitInput Clock Type Screen 2 I/O Settings Configuration ScreenEnable Active High/Low Input Clock FilterFault Indication IMS Part Number/Serial Number ScreenIMS SPI Upgrader Screen Upgrade InstructionsInitialization Screen Port MenuMotor Settings Screen PWM Current Control PWM MaskMaximum PWM Duty Cycle % Parameter PWM Frequency Range ParameterExample PWM Settings By Motor Specifications PWM Control BitsSPI Timing Notes Using User-Defined SPICheck Sum Calculation for SPI SPI Commands and Parameters MSBWrite SPI Communications SequenceIntentionally Left Blank Appendices Intentionally Left Blank Optional Prototype Development Cables MD-CC300-000 USB to SPI Parameter Setup CableAdapter Cables Installation Procedure for the MD-CC300-000 Installing the Cable/VCP DriversFigure A.5 Hardware Update Wizard Screen Determining the Virtual COM Port VCP PD12-1434-FL3 Power, I/O and SPI Wire Color CodePrototype Development Cable PD02-2300-FL3 Prototype Development Cable PD04-MF34-FL3Warranty Excellence in Motion

Motion Detector specifications

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