Danfoss VLT FC 100 Series Programming Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Installation guide Installation guide Operating guide

Contents

Danfoss VLT FC 100 Series Programming Manual Manual pdf 173 page image

3.20. Main Menu - Application Functions - FC 100 - Group 22This group contains parameters used for monitoring VLT HVAC Drive applications.22-00 External Interlock TimerRange: Function:0 * [0 - 600 s] Only relevant if one of the digital inputs in par. 5-1* has been programmed forExternal Interlock [7]. The ExternalInterlock Timer will introduce a delay after the signal has been removed from the digital input programmed forExternal Interlock, before reaction takes place.3.20.1. 22-2* No-Flow DetectionThe frequency converter includes functions for detecting if the load conditions in the system allow the motor to be stopped:*Low Power Detection*Low Speed DetectionOne of these two signals must be active for a set time (No Flow Delay par. 22-24) before selected action takes place. Possible actions to select (par.22-23): No action, Warning, Alarm, Sleep Mode.No Flow Detection:This function is used for detecting a no flow situation in pump systems where all valves can be closed. Can be used both when controlled by the integratedPI controller in the frequency converter or an external PI controller. Actual configuration must be programmed in par. 1-00,Configuration Mode.Configuration mode for- Integrated PI Controller: Closed Loop- External PI Controller: Open LoopCarry out No Flow tuning before setting the PI controller parameters!VLT® HVAC Drive Programming Guide 3. Parameter DescriptionMG.11.C5.02 - VLT ® is a registered Danfoss trademark 1733