Advanced Motion Controls 12A8 - Encoder Feedback; Tachometer Feedback

MNALAZIN-02 10
Products and System Requirements / Feedback Supported
commutationstate(seeTable2.4above)whichisavalidstatein60‐degreephasing.
Connectonlytwoofthemotoroutputwires,MotorAandMotorB.
or:
• TieoneoftheHallSensorinputsontheAZdrivetosignalground.SincetheHallSensor
inputsarebydefaultinternallybroughthighto+5V,thiswillputtheAZdriveina
commutationstatewheretwoHallinputsarehigh,andoneislow(asshowninTable2.4,
havingallthreeHallinputspulledhig
hisaninvalidcommutationstatein120‐degree
phasing).DependingonwhichHallSensorinputistiedtoground,consultTable2.4above
todeterminewhichtwomotoroutputwireswillbeconductingcurr
entforthatspecific
commutationstate.
FIGURE 2.3 Encoder Feedback Signals
Encoder-A
Encoder-B
Encoder-A
Encoder-B
Example 1: Encoder-A precedes
Encoder-B. The pulses arrive at
a certain frequency, providing
speed and directional
information to the drive.
Example 2: Encoder-B precedes
Encoder-A, meaning the direction
is opposite from Example 1. The
signal frequency is also higher,
meaning the speed is greater
than in Example 1.
Encoder Feedback
AZBExxA8drivesutilizetwosingle‐endedincrementalencoderinputsforvelocitycontrol.The
encoderprovidesincrementalpositionfeedbackthatcanbeextrapolatedintoveryprecise
velocityinformation.Theencodersignalsarereadas"pulses"thattheAZdriveusesto
essentiallykeeptrackofthemotor’spositionanddirectionofrotation.Basedonthespeedand
orderinwhichthesepulsesarereceivedfromthetwoencodersignals,thedrivecaninterpret
themotorvelocity.Thediagrambelowrepresentsencoder"pulse"signals,showinghow
dependentonwhichsignalisreadfirstandatwhatfrequencythe"pulses"arrive,thespeed
anddirectionofthemotorshaftcanbeextrapolated.
Tachometer Feedback
AZBExxA8andAZBHxxA8drivesoffertheoptionofusingaDCTachometerforvelocitycontrol.
ThetachometerprovidesananalogDCvoltagefeedbacksignalthatisrelatedtotheactual
motorspeedanddirection.Thedrivesubsequentlyadjuststheoutputcurrentbasedonthe
errorbetweenthetachometerfeedbackandtheinputcommandvoltage.Themaximumrange
ofthetachometerfeedbacksignalis±60VDC.
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