Danfoss VLT PROFIBUS DP MCA 101 Programming Manual

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Danfoss VLT PROFIBUS DP MCA 101 Programming Manual Manual pdf 17 page image

The content of PCD 3 to PCD 10 is determined by thesettings in parameter 9-16 PCD Read Configuration.4.2.3 Reference HandlingThe reference handling is an advanced mechanism thatsums up references from different sources, as shown inIllustration 4.2.For more information on reference handling, refer to theDesign Guide of the relevant frequency converter.Illustration 4.2 ReferenceThe reference, or speed setpoint, is sent via PROFIBUS andis always transmitted to the frequency converter inpercentage format as integers represented in hexadecimal(0-4000 hex).The reference (MRV) and feedback (MAV) are always scaledequally. The setting of 3-00 Reference Range determines thescaling of the reference and feedback (MAV), seeIllustration 4.3.Illustration 4.3 Reference (MRV) and Feedback (MAV), ScaledNOTICEWhen 3-00 Reference Range is set to [0] Min - Max, anegative reference is handled as 0%.The actual output of the frequency converter is limited bythe speed limit parameters Motor Low/High Speed Limit[RPM/Hz] in 4-11 Motor Speed Low Limit [RPM] to 4-14 MotorSpeed High Limit [Hz].The final speed limit is set in 4-19 Max Output Frequency.Table 4.3 lists the reference (MRV) and the feedback (MAV)formats.MRV/MAV Integer in hex Integer in decimal100% 4000 16,38475% 3000 12,28850% 2000 8,19225% 1000 4,0960% 0 0-25% F000 -4,096-50% E000 -8,192-75% D000 -12,288-100% C000 -16,384Table 4.3 Reference/Feedback (MRV/MAV) FormatNOTICENegative numbers are formed as complement of 2.NOTICEThe data type for MRV and MAV is a N2 16-bitstandardised value, expressing a range from -200% to+200% (8001 to 7FFF).ExampleThe following settings determine the speed, as shown inTable 4.4:• 1-00 Configuration Mode set to [0] Speed openloop.• 3-00 Reference Range set to [0] Min-Max.• 3-02 Minimum Reference set to 100 RPM.• 3-03 Maximum Reference set to 3000 RPM.MRV/MAV Actual speed [RPM]0% 0 hex 10025% 1000 hex 82550% 2000 hex 155075% 3000 hex 2275100% 4000 hex 3000Table 4.4 Actual Speed for MRV/MAV4.2.4 Process Control OperationIn process control operation, 1-00 Configuration Mode is setto [3] Process.The reference range in 3-00 Reference Range is always [0]Min - Max.Control Programming GuideMG37G102 Danfoss A/S © Rev. 05/2014 All rights reserved. 154 4