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

27-27 Min Speed Destage DelayRange: Function:turning off a pump if all variable speedpumps are operating at minimum speed, butthe feedback is still within the specified band.Under these conditions, a pump may beturned off and the system is still able tomaintain control. The pumps that remain onoperate more efficiently.e75za640.12(4-12)(27-27)F minF VLT pumpDestagetimer periodPumpswitch-offIllustration 3.102 Destage Function Time3.24.7 27-3* Staging SpeedParameters for configuring the master/slave controlresponse.27-30 Auto Tune Staging SpeedsOption: Function:[0] Disabled[1] * Enabled When this option is selected, the frequencyconverter calculates and keeps parameters 27-31to 27-34 up to date. If parameter 27-31 Stage OnSpeed [RPM], parameter 27-32 Stage On Speed [Hz],parameter 27-33 Stage Off Speed [RPM], andparameter 27-34 Stage Off Speed [Hz] are modifiedvia the fieldbus or LCP, then the new values areused but are continuously automatically tuned.The frequency converter recalculates and updatesthe parameters when staging occurs andoptimizes the settings to ensure highperformance and low energy consumption.27-31 Stage On Speed [RPM]Range: Function:Sizerelated*[ 0 - par.4-13RPM]To be used if RPM is selected.If the lead pump is operating above StageOn Speed for the time specified inparameter 27-23 Staging Delay and a27-31 Stage On Speed [RPM]Range: Function:variable speed pump is available, it isturned on.Illustration 3.103 SBW Staging Delay175ZA671.11(27-24) SBW destage delaySBWSBWSetpoint(27-20)(27-20)Illustration 3.104 SBW Destaging Delay27-32 Stage On Speed [Hz]Range: Function:Sizerelated*[ 0 -par. 4-14Hz]If the lead pump speed is exceeding thevalue in this parameter for the timespecified in parameter 27-23 Staging Delayand a variable speed pump is available,the variable pump is turned on.27-33 Stage Off Speed [RPM]Range: Function:Sizerelated*[ 0 -1500RPM]If the lead pump speed is lower than thevalue in this parameter for the timespecified in parameter 27-24 DestagingDelay and more than 1 variable speedpump is on, a variable speed pump isturned off.27-34 Stage Off Speed [Hz]Range: Function:Sizerelated*[ 0.0 -50 Hz]If the lead pump speed is lower than thevalue in this parameter for the timespecified in parameter 27-24 Destaging DelayParameter Description VLT® AQUA Drive FC 202228 Danfoss A/S © 05/2018 All rights reserved. MG20OB0233