Danfoss VLT AQUA Design Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Operating instructions

Contents

7.5. Examples7.5.1. Writing a parameter valueChange par. 4-14Motor Speed High Limit [Hz] to 100 Hz.Write the data in EEPROM.PKE = E19E Hex - Write single word in par. 4-14Motor Speed High Limit[Hz]IND = 0000 HexPWEHIGH = 0000 HexPWELOW = 03E8 Hex - Data value 1000, corresponding to 100 Hz, seeConversion.The telegram will look like this:Note: Parameter 4-14 is a single word, and the parameter command forwrite in EEPROM is “E”. Parameter number 414 is 19E in hexadecimal.The response from the slave to the master will be:7.5.2. Reading a parameter valueRead the value in par. 3-41Ramp 1 Up Time.PKE = 1155 Hex - Read parameter value in par. 3-41Ramp 1 Up TimeIND = 0000 HexPWEHIGH = 0000 HexPWELOW = 0000 HexIf the value in par. 3-41Ramp 1 Up Time is 10 s, the response from theslave to the master will be:NB!3E8 Hex corresponds to 1000 decimal. The conversion index for par. 3-41 is -2, i.e. 0.01.7.6. Modbus RTU Overview7.6.1. AssumptionsThese operating instructions assume that the installed controller supports the interfaces in this document and that all the requirements stipulated in thecontroller, as well as the frequency converter, are strictly observed, along with all limitations therein.VLT® AQUA Drive Design Guide 7. RS-485 Installation and Set-upMG.20.N3.02 - VLT® is a registered Danfoss trademark 1357