ABB ACS250 Technical Instruction

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Technical instructionACS250 micro drives, 110-480 VRemote push button speed controlOptionalcontrol lock-offRun/StopSpeed upSpeed down(Optional)Fwd/Rev+24 V outputDigital input 1Digital input 2Digital input 4Digital input 31234567OverviewFor some applications it can be preferable to control thespeed of a motor by increasing and decreasing speed usingpush button controls mounted on a control panel or operatorstation, sometimes referred to as digital potentiometer speedcontrol. This techincal instruction describes two examples ofhow this can be implemented on the ACS250.Solution one wiring diagramThe following circuit uses a standard single pole switchfor start and stop control with momentary push buttons toincrease and decrease speed.provided as a key switch or a lock-off on the control panel.The start mode for the drive is set to edge triggered so thatthe start input must always be applied after the control lock-off is disabled (closed). This input should not be used as asafety related input for the application. In the event of anysafety related issues the drive should be fully isolated fromthe mains supply.The run/stop input provides a run command to the drivewhen the switch is in the closed position and a stop when theswitch is open.The speed up and speed down are momentary push buttonsthat are held in to increase or decrease the speed referenceto the drive.The fwd/rev switch is optional depending on whether bi-directional (forward and reverse) motor rotation is required.The drive operates in the forward direction when the switch isopen and reverses when the switch closes.Solution one parameter set upThe drive should be defaulted back to factory settings priorto set up. The following parameters are set within the drive toactivate the functionality shown in the control diagram. Checkall parameters have been set correctly prior to enabling thedrive.Solution one operationThe optional lock-off provides a useful feature which stopsoperation of all of the other input functions and preventsoperation of the drive when in the open position. It could be

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