Siemens LMV5 Series Technical Instructions

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section5 Page12SCCInc.
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NOTE:ThetotaltimeofthestandardizationshowninFigure5‐3is70seconds withaVFDramptime
of30seconds.LongerVFD/LMV52ramptimeswillincreasethetotaltimetakenforthe
standardization.
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NOTE:TheVFDisspannedso20mA=62Hz.Thus,19.5mAisapproximately60Hz.
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BasedoffoftheRPMthatwasreadat19.5mA(inthiscase3544RPM)andanassumptionof0RPMat
minimumsignal(typically4mA),atwo pointli
nearinterpolationisautomaticallydonebytheLMV52,
whichestablishesthelinearrelationshipbetweentheanalogsignalandtheblowerRPM.This
relationshipisshowninFigure5‐4.
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Figure5‐4:Resu
ltofStandardization(2‐poleblowermotor)andAnalogSignalCorrectionLimits
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Whentheburnerisinoperation,theLMV52hasactive,closed‐loopcontroloftheblowermotorspeed
andcancompensateformotorslipandotherfacto
rswithinlimits.Theanalogsignalcanbeincreasedto
compensateforlow
blowerRPManddecreasedtocompensateforhighblowerRPM.Theseanalog
signallimitsarealsoshowninFigure5‐4.
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IftheanalogsignalisincreasedtothemaximumallowablesignalandtheblowerRPMisstilllow,a
messagewillbedisplayedontheAZLthatstates“Fan speednotreached”.
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Siemens LMV5 Series Specifications

General

Brand	Siemens
Model	LMV5 Series
Category	Control Systems
Language	English