Danfoss VLT AQUA Drive FC 202 Programming Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

Contents

If no flow is detected, the frequency converter increasesthe setpoint for pressure to ensure a slight overpressure inthe system (boost to be set in parameter 22-45 SetpointBoost).The feedback from the pressure transducer is monitored.When this pressure has dropped with a set percentagebelow the normal setpoint for pressure (Pset), the motorramps up again. The pressure is then controlled forreaching the set value (Pset).External PIDcontrollerFC130BA256.11PP SystemP SetfOutfRefIllustration 3.68 System with Pressure FeedbackIn systems where the pressure or temperature is controlledby an external PI controller, the wake-up conditions cannotbe based on feedback from the pressure/temperaturetransducer as the setpoint is not known. In the examplewith a boost system, pressure Pset is not known. Setparameter 1-00 Configuration Mode for [1] Open loop.Example: Boost system.130BA258.10t1p (Pressure)TimeTimeNo/Low FlowdetectedpSystemP SetSleep modeactivatedP Ref = PWake(Frequency)f ReffRef / fOutfRef fOutf WakefOutIllustration 3.69 Boost System without Pressure FeedbackWhen low power or low speed is detected, the motor isstopped, but the reference signal (fref) from the externalcontroller is still monitored, and because of the lowpressure created, the controller increases the referencesignal to gain pressure. When the reference signal hasreached a set value fwake, the motor restarts.The speed is set manually by an external reference signal(remote reference). Set the settings (parameter group 22-3*No-Flow Power Tuning) for tuning of the no-flow functionto default.Internal PI controller(parameter 1-00 Configuration Mode)External PI controller or manual control(parameter 1-00 Configuration Mode)Sleep mode Wake up Sleep mode Wake upNo-flow detection (pumps only) Yes – Yes (except manualsetting of speed)–Low-speed detection Yes – Yes –External signal Yes – Yes –Pressure/temperature(transmitter connected)– Yes – NoOutput frequency – No – YesTable 3.29 Overview of Configuration PossibilitiesNOTICESleep mode is not active when local reference is active(set speed manually with the navigation keys on theLCP). See parameter 3-13 Reference Site.Does not work in hand-on mode. Carry out auto set-upin open loop before setting input/output in closed loop.22-40 Minimum Run TimeRange: Function:60 s* [0 - 600 s] Set the minimum running time for the motorafter a start command (digital input orfieldbus) before entering sleep mode.Parameter Description VLT® AQUA Drive FC 202184 Danfoss A/S © 05/2018 All rights reserved. MG20OB0233