Chapter 5 – Standard Application Macro Programs5-6ACH 500 Programming ManualApplication 2 –Floating Point ControlHVAC applications using a Dwyer Photohelic or similar instrument tomaintain static pressure. Speed increase and speed decrease contacts are usedto control the speed of the ACS 500.Operation DiagramFigure 5-3 Operation DiagramInput and OutputSignalsTable 5-3 Input and Output SignalsInput Signals Output SignalsTwo Analog Reference inputs.Six Digital Inputs: Start Hand, Start Auto,Preset Speed (2), Auto Select, and RunEnable.Analog Output AO1: Output FrequencyAnalog Output AO2: Output CurrentRelay Output RO1: READYRelay Output RO2: RUNRelay Output RO3: FAULTfAM3ΦOutputCurrentRelayOutputsMotorExt. ControlsInputPowerlocation
