ABB 580 Series How To Set Up

Also see for ACH580 Series: User manual Quick start up guide Installation, operation and maintenance manual User manual Quick start up guide

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LVD-EOTKN047U-EN REV AEffective: 2020-10-05 1—Technical Note 047Floating point controlHow to setup floating point controlThe design of some air handling equipment uses a pressure control switch, such as a Dwyer® Photohelic, to control pressure by varyingmechanical parts of the air handler. The air handling equipment can be found on a wide range of applications, such as an air handler ina commercial high-rise building, or a paint booth at an auto body repair shop. In addition to air handling applications, these types ofswitches are also used on pumping systems to control pressure.The 580 series drive can integrate easily with a pressure control switch in a retrofit or new application. The 580 series is made up of theACH580, ACQ580 and ACS580.Fixed speed applications (without a drive) have the pressure control switch vary mechanical devices to control system pressure. Withthe addition of a drive, the pressure control switch no longer varies mechanical devices to control system pressure, and instead theswitch is wired directly to a drive. The drive controls the speed of the motor to control system pressure. Pressure control switches arean electro-mechanical device that allows for a setpoint to be set, usually with knobs on the front of the controller. The device willmechanically monitor the pressure. As the pressure increases or decreases, switches (usually Form-C relays) within the device willtoggle on and off. This type of control in the HVAC industry is sometimes calledfloating point control. The toggling on/off of therelays can be used to control the speed of a drive.Floating point control is the term used in the HVAC industry, but some industries use the termmotor potentiometer orMOP. Drivedocumentation may reference one or both terms.The 580 drive can easily be setup to operate from a Photohelic® or equivalent pressure control switch. The following procedureassumes an ACH580 drive configured with Primary Settings.Step 1: Set theReference from toFloating point by navigating to:Primary Settings > Start, stop, reference > Primary auto control location > Reference from: Floating pointStep 2: There are three different configuration options that can be selected. Select the control configuration that best fits theapplication.Primary Settings > Start, stop, reference > Primary auto control location > Floating point control > ConfigurationA description of each configuration is described below: Init at power-upo The drive will always start at the same initial value reference point when a new run command isgiven. This setting always provides a consistent starting speed.o If the drive were cycled from AUTO, to HAND, and then back to AUTO mode, the drive will rampto the last frequency it was running at in AUTO mode.o If this configuration is chosen, then set theInitial value by navigating to:Primary Settings > Start, stop, reference > Primary auto control location > Floating point control >Initial valueo The benefit of this configuration is upon every fresh run command in AUTO mode the startingreference is a known constant.

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