Siemens LMV5 Series Technical Instructions

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section7 Page22 SCCInc.
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AZLSays“FanSpeedNotReached”or“ControlRangeLimitationVSDModule”
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Duringburneroperation,theLMV52sendsa0/4‐20mAsign al totheVSDtocontrolthespeed
oftheblower.ThespeedsensorsendsfeedbacktotheLMV52toletitknowtheactualspeed
oftheblower.Ifthespeedistoohighortoolow,theLMV52willincreaseordecreasethe
signaltotheVSDaccordingly.However,therearelimitsonhowmuchtheLMV52canincrease
ordecreasethesignal.Iftheselimitsaremet,theLMV52willlockoutwithoneofthefollowing
messages:
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 “FanSpeedNotReached”–Errorcode15,diagnostic10or40
 “ControlRangeLimitationVSDModule”–ErrorcodeA9,diagnostic0D
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“FanSpeedNotReached”indicatesthattheblowerspeedisstilltooloweventhoughthe
LMV52hasincreasedthe0/4‐20mAsignalasfaraspossible.
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“ControlRangeLimitationVSDModule”indicatesthattheblowerspeedistoohigheventhough
theLMV52hasdecreasedthe0/4‐20mAsignalasfaraspossible.
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Ifeitherofthesemessagesappears,dothefollowing:
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1. IncreasetheramptimesofboththeVSDandLMV52.ShorterramptimesontheVSDand
LMV52createamoredemandingapplicationfortheVSD.Simplyput,ashorterramptime
willcausetheVSDtodraworabsorbmuchmoreamperageforagivenchangeinblower
speedsincethechangeinspeedoccursmorequickly.Toadjusttheramptimesofthe
LMV52,usethefollowingmenupaths:
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Params&Display>RatioControl>Times>OperatRampMod
Params&Display>RatioControl>Times>TimeNoFlame
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2. Largeblowermotorsconnectedtolarge,heavyblowerwheelshavehighrotatinginertia.
Astheinertiaoftheblowerwheelincreases,thepowerneededtoaccelerateand
deceleratetheblowerincreases.Ifincreasingtheramptimes
doesnothelp,abraking
resistormayneedtobeinstalledontheVSDtohelpdecreasethespeedoftheblower
motormorequickly.
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Siemens LMV5 Series Specifications

General

Brand	Siemens
Model	LMV5 Series
Category	Control Systems
Language	English