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

PPPPPPVAVBoxZone 1DamperCooling/heating coilSupplyair fanReturn air fanDamperDamperZone 2Zone 3VAVBoxVAVBox130BA353.10Illustration 6.17 Example, Multi-zone, Single SetpointExample 2 – Multi-zone, multi-setpointThe previous example illustrates the use of multi-zone,multi-setpoint control. If the zones require differentpressures for each VAV box, each setpoint may bespecified in parameter 20-21 Setpoint 1,parameter 20-22 Setpoint 2 and 20-23 Setpoint 3. Byselecting [5] Multi-setpoint minimum inparameter 20-20 Feedback Function, the PID controllerincreases the fan speed if any one of the feedbacks isbelow its setpoint. If all feedbacks are above theirindividual setpoints, the PID controller decreases the fanspeed.20-21 Setpoint 1Range: Function:0ProcessCtrlUnit*[-999999.999 -999999.999ProcessCtrlUnit]Setpoint 1 is used in closed-loop mode to enter asetpoint reference that isused by the frequencyconverter’s PID controller. Seethe description ofparameter 20-20 FeedbackFunction.NOTICEThe setpoint referenceentered here is added toany other references thatare enabled (seeparameter group 3-1*References).20-22 Setpoint 2Range: Function:0ProcessCtrlUnit*[-999999.999 -999999.999ProcessCtrlUnit]Setpoint 2 is used in closed-loop mode to enter asetpoint reference that maybe used by the frequencyconverter’s PID controller. Seethe description ofparameter 20-20 FeedbackFunction.NOTICEThe setpoint referenceentered here is added toany other references thatare enabled (seeparameter group 3-1*References).How to Programme Operating Instructions96 Danfoss A/S © 08/2014 All rights reserved. MG11F50266