Danfoss vlt hvac drive fc 102 Operating Instructions Manual

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

Contents

20-00 Feedback 1 SourceOption: Function:[104] Sensorless Flow Requires set up by MCT 10 Set-upSoftware with sensorless specificplug in.[105] Sensorless Pressure Requires set up by MCT 10 Set-upSoftware with sensorless specificplug in.NOTICEIf a feedback is not used, its source must be set to [0] NoFunction. Parameter 20-20 Feedback Function determineshow the three possible feedbacks will be used by thePID Controller.20-01 Feedback 1 ConversionOption: Function:This parameter allows a conversion functionto be applied to Feedback 1.[0]*Linear No effect on the feedback.[1] Square root Commonly used when a pressure sensor isused to provide flow feedback(flow ∝pressure ).[2] Pressure totemperatureUsed in compressor applications to providetemperature feedback using a pressure sensor.The temperature of the refrigerant iscalculated using the following formula:Temperature =A2ln Pe + 1 −A1 −A3,where A1, A2 and A3 are refrigerant-specificconstants. The refrigerant must be selected in20-30 Refrigerant. Parameter 20-21 Setpoint 1through 20-23 Setpoint 3 allow the values ofA1, A2 and A3 to be entered for a refrigerantthat is not listed in 20-30 Refrigerant.[3] Pressure toflowUsed in applications where the air flow in aduct is to be controlled. The feedback signalis represented by a dynamic pressuremeasurement (pitot tube).Flow =Duct Area ×Dynamic Pressure×Air Density FactorSee also 20-34 Duct 1 Area [m2] through20-38 Air Density Factor [%] for setting of ductarea and air density.[4] Velocity toflowUsed in applications where the air flow in aduct is to be controlled. The feedback signalis represented by an air velocitymeasurement.Flow =Duct Area ×Air VelocitySee also 20-34 Duct 1 Area [m2] through20-37 Duct 2 Area [in2] for setting of duct area.20-03 Feedback 2 SourceOption: Function:See parameter 20-00 Feedback 1Source for details.[0] * No function[1] Analog Input 53[2] Analog Input 54[3] Pulse input 29[4] Pulse input 33[7] Analog Input X30/11[8] Analog Input X30/12[9] Analog Input X42/1[10] Analog Input X42/3[11] Analog Input X42/5[15] Analog Input X48/2[100] Bus Feedback 1[101] Bus Feedback 2[102] Bus feedback 3[104] Sensorless Flow[105] Sensorless Pressure20-04 Feedback 2 ConversionOption: Function:See parameter 20-01 Feedback 1Conversion for details.[0] * Linear[1] Square root[2] Pressure to temperature[3] Pressure to flow[4] Velocity to flow20-06 Feedback 3 SourceOption: Function:See parameter 20-00 Feedback 1Source for details.[0] * No function[1] Analog Input 53[2] Analog Input 54[3] Pulse input 29[4] Pulse input 33[7] Analog Input X30/11[8] Analog Input X30/12[9] Analog Input X42/1[10] Analog Input X42/3[11] Analog Input X42/5[15] Analog Input X48/2[100] Bus Feedback 1[101] Bus Feedback 2[102] Bus feedback 3[104] Sensorless Flow[105] Sensorless PressureHow to Programme VLT HVAC Drive FC 102 Operating Instructions104 MG11F402 - Rev. 2013-12-1666