Advanced Motion Controls 12A8 - Input Reference Wires

FIGURE 3.2 Feedback Wiring
Motor Feedback
Motor Power
Avoid running
feedback and power
wires together
Motor Feedback
Motor Power
Separate power and
feedback wires
where possible
Motor
AZ SERVO
DRIVE
Motor
AZ SERVO
DRIVE
MNALAZIN-02 21
Integration in the Servo System / Wiring
motor,trytofindseparatepathsthatmaintaindistancebetweenthetwo.Aruleofthumbfor
theminimumdistancebetweenthesewiresis10cmforevery10mofcablelength.
Input Reference Wires
Useofatwisted,shieldedpairfortheinputreferencewiresisrecommended.Connectthe
referencesource"+"to"+REFIN",andthereferencesource"‐"(orcommon)to"‐REFIN".
ConnecttheshieldtothemountingcardorPCBinterfacechassisground.Theservodrive’s
referenceinputcircuitwillattenuatethecommonmodevoltagebetweensignalsourceand
drivepowergrounds.
In case of a single-ended reference signal, connect
the command
signal to "+ REF IN" and connect the command return and "- REF IN" to
signal ground.
Longsignalwires(10‐15feetandup)canalsobeasourceofno
isewhendrivenfromatypical
OP‐AMPoutput.DuetotheinductanceandcapacitanceofthewiretheOP‐AMPcanoscillate.It
isalwaysrecommendedtosetafixedvoltageatthecontrollerandthencheckthesignalatthe
drivewithanoscilloscopetomakesurethatthesignalisnoisefree.
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