Danfoss VLT Manual

Also see for VLT: Pocket guide Instruction manual Operating instructions Programming guide Programming guide

Danfoss VLT Manual Manual pdf 1 page image

The perfect solution for• Intelligent control• HVAC system protection• Remote status reportingThe VLT® HVAC Drive provides a new No-Flow detection featurefor pump systems. This feature is useful for detecting conditionswhere a pump is producing no fl ow – a condition that can causepump damage if not detected and corrected.No fl ow based on motorpower and frequencyNo-Flow Detection is based on themeasurement of power at specificmotor speeds. The drive monitorsactual power and motor frequencyand compares it to the calculatedno-flow power at specific speeds.If the power measured at a specificfrequency is greater than the no-flowpower calculated by the drive, thepump is producing flow. If the powermeasured is less than the no-flowpower calculated by the drive, awarning or alarm is generated tonotify the operator of the condition.To determine the no-flow power levelthroughout the speed range, thedrive generates a power vs. frequencycurve that represents the no-flowcondition. This curve is generated bythe drive from two data points. Thesepower/frequency points can beentered into the drive automaticallyor manually.Manual or Auto Set Up are availableThe Auto Set Up automatically stepsthe user through the commissioningprocess, storing the data measured.When the automatic set-up is selectedthe output frequencies used are 50%and 85% of maximum. Manual set-upcan be used when a different pair offrequencies is desired.Programming is quick and easyThe drive software makes program-ming the No-Flow feature quick andeasy by choosing Pump Functionsand then No-Flow Function under theQuick Menu.Features Benefi tsEliminates an external differentialpressure switch or flow meter Reduce installation and maintenance costEliminates wiring for external sensors Reduce installation and maintenance costA warning or alarm can alert operatorof the problemProvides proper operation of equipment andincreases occupant comfortProgramming is quick and easy withpre-programmed software Saves time and increases reliablityVLT® No Flow Feature

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