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

22-22 Low Speed DetectionOption: Function:minimum as required for the normal low speeddetection.When this option is selected, the frequencyconverter creates a pressure pulse (boost of thepressure) when the feedback is within therange defined in parameter 7-39 On ReferenceBandwidth for a time period defined inparameter 22-40 Minimum Run Time or longer.Parameter 22-45 Setpoint Boost adjusts theheight of the pulses.Parameter 22-46 Maximum Boost Time definesthe maximum length of the pulse.Refer to Cascade Controller Options MCO101/102 Operating Instructions for moreinformation about the cascade controller.NOTICEEnsure that the system can withstandthe boost pressure.22-23 No-Flow FunctionCommon actions for low-power detection and low-speeddetection (individual selections not possible).Option: Function:[0] * Off NOTICEDo not set parameter 14-20 Reset Mode,to [13] Infinite auto reset, whenparameter 22-23 No-Flow Function is setto [3] Alarm. Doing so causes thefrequency converter to continuouslycycle between running and stoppingwhen a no-flow condition is detected.NOTICEDisable the automatic bypass functionof the bypass if the frequency converteris equipped with a constant-speedbypass with an automatic bypassfunction starting the bypass if thefrequency converter experiences apersistent alarm condition, and [3]Alarm is selected as the no-flowfunction.[1] SleepModeThe frequency converter enters sleep modeand stops when a no-flow condition isdetected. See parameter group 22-4* SleepMode for programming options for sleepmode.[2] Warning The frequency converter continues to run, butactivates a no-flow warning (warning 92,NoFlow). A digital output or a serial communi-22-23 No-Flow FunctionCommon actions for low-power detection and low-speeddetection (individual selections not possible).Option: Function:cation bus can communicate a warning toother equipment.[3] Trip The frequency converter stops running andactivates a no-flow alarm (alarm 92, NoFlow). Afrequency converter digital output or a serialcommunication bus can communicate analarm to other equipment.[4] Stop andTrip22-24 No-Flow DelayRange: Function:10 s* [1 - 600 s] Set the time that low power/low speed muststay detected to activate signal for actions. Ifdetection disappears before the timer runsout, the timer is reset.22-26 Dry Pump FunctionSelect the action for dry-pump operation.Option: Function:[0]*OffParameter Description VLT® AQUA Drive FC 202180 Danfoss A/S © 05/2018 All rights reserved. MG20OB0233