Advanced Motion Controls 12A8 - Page 44

MNALAZIN-02 36
Operation / Getting Started
theelementsshouldbeproperlygroundedinacentralpointlocation,andnopowerorinput
commandshouldbeappliedtoanyelementinthesystem.
Oncecertainthatallthesestepshavebeensafelyandproperlyfollowed,turnonthemainDC
powersupply.UseavoltmeterordigitalmultimetertoonceagainchecktheDCpowersupply
level.
Analog Input Drives
1. Turnonthe"test"powersupplyconnectedtotheexternalpotentiometer.
2. Sl
owlyturnthepotentiometerinonedirectionwhileobservingthemotorshaft.
Only make very slight adjustments to the reference potentiometer to
avoid
causing damage to the motor. Since the drive is in Current
(Torque) Mode and there is no load on the motor shaft, even a small
potentiometer adjustment can create high speeds at the motor shaft.
Exercise caution when adjusting the potentiometer.
• Forsinglephasemotors,thisshouldcausethemotorshafttoenergizeinonedirection.
Slowlyturningthepotentiometerfurtherinthatsamedirection,andalsointheopposite
directionshouldcausethemotorshafttomovesmoothlyinresponsetotheinput.
• Forthreephasemotors,thethreemotorwiresmayhavetobechangedinorderto
properlycommutatethemotor.Therearesixdifferentwaysthatthethreemotorwires
canbeattachedtothemountingcardorPCBinterface.Allsixwillhavetobetestedinorder
tofindtherightcommutation.
Before removing the motor wires, turn of
f both the main DC power supply
and the "test" power supply. Never remove or make any connections to
the drive while power is applied!
Thepropercombinationofmotorwir
eswillyieldsmoothmotionandidenticalspeedsin
bothdirections.Impropercombinationswillcausejerkymotion,slowmovementinone
direction,and/oraudiblenoise.Oncethepropercombinationhasbeenfound,turningthe
potentiometerslowlyinbothdirectionsshouldcausethemotorshafttorotateappropri‐
atelyinresponsetotheinput.
PWM Input Drives
1. TurnonthefunctiongeneratortoapplythePWMsignaltothePWMINpin.
2. Monit
ortheFunctionGeneratorPWMsignalonanoscilloscope.BesuretokeepthePWM
frequencywithinthe10‐25kHzrange.ByvaryingthedutycycleofthePWMinputsignal,
themotorshaftshouldrotateinresponsetotheinput.
• Forsinglephasemotors,thisshouldcausethemotorshafttoenergizeinonedirection.
SlowlyvaryingthePWMdutycycleshouldcausethemotorshafttomovesmoothlyin
responsetotheinput.
• Forthreephasemotors,thethreemotorwiresmayhavetobechangedinorderto
properlycommutatethemotor.Therearesixdifferentwaysthatthethreemotorwires
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