Danfoss VLT DriveMotor FCP 106 Design Manual

Also see for VLT DriveMotor FCP 106: Operating instructions Operating instructions Operating instructions Design guide Design guide

2.3.2 Control Structure Closed Loop (PI)The internal controller allows the drive to become a part of the controlled system. The drive receives a feedback signal froma sensor in the system. It then compares this feedback to a setpoint reference value and determines the difference, if any,between these 2 signals. It then adjusts the speed of the motor to correct this difference.For example, consider a pump application controlling the speed of a pump to ensure a constant static pressure in a pipe.The desired static pressure value is supplied to the drive as the setpoint reference. A static pressure sensor measures theactual static pressure in the pipe and supplies this data to the drive as a feedback signal. If the feedback signal is greaterthan the setpoint reference, the drive reduces speed to reduce the pressure. In a similar way, if the pipe pressure is lowerthan the setpoint reference, the drive automatically speeds up to increase the pump pressure.ReferenceFeedbackS+-*[-1]PI100%0%100%-100%Scale tospeedTo motorcontrolP 4-10Motor speeddirectionP 4-19Max outputfrequency (Hz)20-81 PINormal/Inversecontrol195NA450.11Illustration 2.14 Closed-loop ControllerWhile the default values for the closed-loop controller often provide satisfactory performance, the control of the system canoften be optimized by adjusting the closed-loop controller parameters.2.4 Local [Hand On] and Remote [Auto On] ControlOperate the drive manually via the local control panel(LCP) or remotely via analog/digital inputs or fieldbus.Start and stop the drive pressing the [Hand On] and [Off/Reset] keys on the LCP. Set-up is required:• Parameter 0-40 [Hand on] Key on LCP.• Parameter 0-44 [Off/Reset] Key on LCP.• Parameter 0-42 [Auto on] Key on LCP.Reset alarms via the [Off/Reset] key or via a digital input,when the terminal is programmed to Reset.e30bp046.12HandOn Off AutoOn ResetIllustration 2.15 LCP Control KeysLocal reference forces the configuration mode to openloop, independent of the setting in parameter 1-00 Configu-ration Mode.Local reference is restored at power-down.Product Overview Design GuideMG03M302 Danfoss A/S © 12/2018 All rights reserved. 172 2