Advanced Motion Controls 12A8 - Interface Circuitry Examples; DC Power Input

MNALAZIN-02 27
Integration in the Servo System / Interface Circuitry Examples
• KeephighcurrenttracesshortTracescarryinghighcurrent,suchastheDCPower
tracesandMotorSignaltraces,shouldbekeptshortandclosetogethertominimizenoise
emissions.Also,keepDCPowertracesseparatefromMotorSignaltraceswherepossible.
• Designformaximumval uesAdjacenttracescancarryavoltagepotentialequaltothe
maximumDCpowersupplyvalue,andcarrycurrentofboththeAZservodrive’speakand
continuouscurrentratings.Thetracewidthandcopperplatingthicknesswillneedtotake
thesemaximumvaluesintoaccount.Also,beawarethatAZservodrivepinheadershavea
maximumcurrentratingof3ampsDCperpin.Inordertoachieveahigheroverallpeak
currentcapability,somehighcurrentsignals"share"agroupofpinstospreadthecurrent
betweenthem.Highcurrenttracesrunningtothesepingroupsshouldbeinter‐connected
onthePCBboard.Consultthedrive’sdatasheetorthe"Pinouts"sectionin“Products
Covered”onpage5forthesepingroupings.
Interface Circuitry Examples
Thefollowingsectionsshowexamplesofhowaninterfaceboardcouldbedesignedtowork
withanAZservodrive,andalsocontaingeneralconnectionrulesandinstructions.
FIGURE 3.7 DC Power Input Wiring
INTERFACE
PCB
AZ SERVO
DRIVE
High Voltage
Isolated DC
Power
Supply
Shield
Single Point
System Ground
(PE Ground)
Power Ground
+HV
GND
Chassis Ground
DC Power Input ThediagrambelowshowshowanAZservodriveconnectstoanisolatedDC
PowerSupplythroughamountingcard/interfacePCB.Noticethatthepowersupplywiresare
shielded,andthatthepowersupplycaseisgroundedatthesinglepointsystemground(PE
Ground).ThecableshieldshouldbegroundedatthemountingcardorPCBinterfacesideto
chassisground.
Depending on the power capacity of the AZ drive model being used
there may be multiple pins for DC Input Power connections. Refer to the
datasheet of the specific model being used. The maximum current
capacity per pin is 3A continuous.
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