Keba ServoOne - LHMES(2) Method

7.8.2LHMES(2)method
Image 7.39: “Auto commutation LHMES(2)” screen
With this method, saturation effects in stator inductance are evaluated. Two test
signal sequences are used for this purpose, whereby the position of the rotor axis is
ID No.: 0842.26B.5-01Date: 09.2020
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7 Control
known after the first sequence and the direction of movement after the second. This
method is suitable for determining the rotor position with braked rotors or motors with
a high mass inertia.
l Thetestsignalperiod(measurementfrequency)isdefinedwithP 392[2] -
CON_ICOM_Time.Ifthisvalueis0,thecontrollerusesadefaulttestsignal
frequencyof100Hz(period10ms).
l Thetestsignal’samplitude(currentI0)isdefinedwithP 393[0] - CON_
ICOM_Current.Ifthevalueis0,theamplitudeisderivedfromthemotorrated
current.Ifanamplitudegreaterthantheswitchingfrequency-dependent
powerstagecurrentisspecified,theamplitudeislimitedtohalfthepower
stagecurrent.
l Thetestsignal’sDCcomponent(currentI1)isdefinedwithP 393[1] - CON_
ICOM_Current.Ifthisvalueis0,theequalportionisdeterminedfromthe
motorratedcurrent.
NOTE
l Asimpleparametersettingisobtainedbyspecifyingthevalue0
forP 392[2] - CON_ICOM_Time,P 393[0] - CON_ICOM_Current
andP 393[1] - CON_ICOM_Current.Theparametersarethen
assigneddefaultvalueswhicharederivedfromthemotor/power
stagecurrent.Thenthemeasurementisperformed.
l InordertobeabletousethecomplexLHMESautocommutation
methodtoitsfullextent,youwillneedtoconsultwithKEBA.
Precondition
The rotor must be securely braked so that it will not be able to move when the rated
current is applied. The stator of the machine must be iron-core.