Advanced Motion Controls 12A8 - Encoder Velocity; Tachometer Velocity

MNALAZIN-02 7
Products and System Requirements / Control Modes
motorRPMthroughthescalingfactor.See“VelocityMonitorOutput”onpage33forthemotor
RPMequation.ThismodeisavailableasaDIPswitchselectablem
odeonAZBHxxA8drives.
Due to the inherent low resolution of motor mounted Hall Sensors, Hall
Velo
city Mode is not recommended for low-speed applications below
300 rpm for a 6-pole motor, 600 rpm for a 4-pole motor, or 900 rpm for a
2-pole motor. Hall Velocity Mode is better suited for velocity control
applications where the motor will be spinning at higher speeds.
Encoder Velocity
InEncoderVelocityMode,theinputcommandcontrolsthemotorvelocity,withthefrequency
oftheencoderpulsesclosingthevelocityloop.Ananalogvelocitymonitoroutputallows
observationoftheactualmotorspeedthroughakHz/Vscalingfactorfoundonthedrive
datasheet.Thevoltagevaluereadatthevelocitymonitoroutputcanbeusedtodeterminethe
motorRPMthroughthescalingfactor.See“VelocityMonitorOutput”onpage33forthemotor
RPMequation.ThismodeisavailableasaDIPswitchselectablem
odeonAZBExxA8drives.
The high resolution of motor mounted encoders allows for
excellent
velocity control and smooth motion at all speeds. Encoder Velocity
mode should be used for applications requiring precise and accurate
velocity control, and is especially useful in applications where low-speed
smoothness is the objective.
Tachometer Velocity
InTachometerVelocityMode,theinputcommandvoltagecontrolsthemotorvelocity.This
modeusesanexternalDCtachometertoclosethevelocityloop.ThedrivetranslatestheDC
voltagefromthetachometerintomotorspeedanddirectioninformation.Thismodeis
availableasaDIPswitchselectablemodeonAZBExxA8andAZBHxxA8drives.
DC Tachometers have infinite resolut
ion, allowing for extremely accurate
velocity control. However, they also may be susceptible to electrical
noise, most notably at low speeds.
Note
Note
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