Danfoss VLT FC 102 Programming Manual

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

Contents

22-50 End of Curve FunctionOption: Function:NOTICEAutomatic restart resets thealarm and restarts the system.NOTICEDo not setparameter 14-20 Reset Mode, to[13] Infinite auto reset, whenparameter 22-50 End of CurveFunction is set to [2] Alarm.Doing so causes the frequencyconverter to continuously cyclebetween running and stoppingwhen an end-of-curvecondition is detected.NOTICEIf the frequency converter isequipped with a constantspeed bypass with anautomatic bypass function thatstarts the bypass if thefrequency converterexperiences a persistent alarmcondition, be sure to disablethe automatic bypass function,if [2] Alarm or [3] Man. ResetAlarm is selected as the end-of-curve function.[0] * Off End-of-curve monitoring is notactive.[1] Warning The frequency converter continuesto run, but activates an end-of-curve warning (warning 94, End ofcurve). A frequency converter digitaloutput or a serial communicationbus can communicate a warning toother equipment.[2] Alarm The frequency converter stopsrunning and activates an end-of-curve alarm (alarm 94, End of curve).A frequency converter digitaloutput or a serial communicationbus can communicate an alarm toother equipment.[3] Man. ResetAlarmThe frequency converter stopsrunning and activates an end-of-curve alarm (alarm 94, End of curve).A frequency converter digitaloutput or a fieldbus can22-50 End of Curve FunctionOption: Function:communicate an alarm to otherequipment.[4] Stop and Trip22-51 End of Curve DelayRange: Function:10 s* [0 - 600 s] When an end-of-curve condition isdetected, a timer is activated. Whenthe time set in this parameterexpires, and the end-of-curvecondition is steady during theentire period, the function set inparameter 22-50 End of CurveFunction is activated. If thecondition disappears before thetimer expires, the timer is reset.3.20.5 22-6* Broken Belt DetectionThe broken-belt detection can be used in both closed-loopand open-loop systems for pumps, fans, and compressors.If the estimated motor torque is below the broken-belttorque value (parameter 22-61 Broken Belt Torque), and thefrequency converter output frequency is above or equal to15 Hz, the broken-belt function (parameter 22-60 BrokenBelt Function) is performed.Parameter Descriptions Programming GuideM0010001 Danfoss A/S © 10/2019 All rights reserved. 2073 3