ABB ACS355 Application Manual

Also see for AC500 Series: Introduction Installation instructions Installation instructions Application Example Installation instructions

ABB ACS355 Application Manual Manual pdf 26 page image

26 Function blocks and program structure Speed reference generationIn the example program, speed reference is generated according to the dip switches(DI_FASTER, DI_SLOWER and DI_REVERS) and the maximum reference limit.The maximum reference limit is read from the drive parameter 11.05 (REF1 MAX) at thefirst start of the ACS3XX_DRIVES_CTRL_BASIC function block and is stored inconfig.iRefScaleMax, a sub-element of the DriveRef variable.The limit depends on the selected motor control mode. There are two possible motorcontrol modes, detailed below. Drive parameter 99.04 Motor Control Mode determines themode used.• Scalar mode: The default mode is the scalar mode. The default value for the driveparameter REF1 MAX is 500 (which corresponds to 50 Hz).• Vector mode: In the vector mode, the drive paramter REF1 MAX is set to themaximum speed given in rpm, eg 1500.If you change the motor control mode, the scaling parameter has to be read again byreseting EN of ACS3XX_DRIVES_CTRL_BASIC. This can be done by powering off andon again the 24V DC of the AC500.DI_FASTER, DI_SLOWER and DI_REVERS are used in the example project as shown inthe below image. See the quick installation guide for the dip switch settings in the ACS355and AC500-eCo starter kit.Other control blocksYou can use the following two control blocks as alternatives for the basic control block. ACS_CTRL_ABB_DRV_PROFILEIf advanced control is needed, theACS_DRIVES_CTRL_STANDARD function block can be usedinstead of the FB_BASIC_CONTROL function block. Refer tothe online help for a detailed description of the function block.