Danfoss VLT AQUA Design Manual

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

Contents

7.1.3. VLT AQUA Hardware SetupUse the terminator dip switch on the main control board of the frequencyconverter to terminate the RS-485 bus.Terminator Switch Factory SettingNB!The factory setting for the dip switch is OFF.7.1.4. VLT AQUA Parameter Settings for Modbus CommunicationThe following parameters apply to the RS-485 interface (FC-port):Parameter Number Parameter name Function8-30 Protocol Select the application protocol to run on the RS-485 interface8-31 Address Set the node address. Note: The address range depends on the protocol se-lected in par. 8-308-32 Baud Rate Set the baud rate. Note: The default baud rate depends on the protocol se-lected in par. 8-308-33 PC port parity/Stop bits Set the parity and number of stop bits. Note: The default selection dependson the protocol selected in par. 8-308-35 Min. response delay Specify a minimum delay time between receiving a request and transmittinga response. This can be used for overcoming modem turnaround delays.8-36 Max. response delay Specify a maximum delay time between transmitting a request and receivinga response.8-37 Max. inter-char delay Specify a maximum delay time between two received bytes to ensure timeoutif transmission is interrupted.7.1.5. EMC PrecautionsThe following EMC precautions are recommended in order to achieve interference-free operation of the RS-485 network.NB!Relevant national and local regulations, for example regarding protective earth connection, must be observed. The RS-485 communi-cation cable must be kept away from motor and brake resistor cables to avoid coupling of high frequency noise from one cable toanother. Normally a distance of 200 mm (8 inches) is sufficient, but keeping the greatest possible distance between the cables isgenerally recommended, especially where cables run in parallel over long distances. When crossing is unavoidable, the RS-485 cablemust cross motor and brake resistor cables at an angle of 90 degrees.7. RS-485 Installation and Set-up VLT® AQUA Drive Design Guide128 MG.20.N3.02 - VLT® is a registered Danfoss trademark7