Danfoss VLT HVAC Drive FC 100 Series Design Manual

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Danfoss VLT HVAC Drive FC 100 Series Design Manual Manual pdf 138 page image

7.1.2 Adjustable Frequency Drive HardwareSetupUse the terminator dip switch on the main control boardof the Adjustable frequency drive to terminate the RS-485bus.1 2S801ON130BA272.11Figure 7.3 Terminator Switch Factory SettingThe factory setting for the dip switch is OFF.7.1.3 Adjustable Frequency DriveParameter Settings for ModbusCommunicationThe following parameters apply to the RS-485 interface(FC-port):Parameter Function8-30 Protocol Select the application protocol to run onthe RS-485 interface8-31 Address Set the node address. Note: The addressrange depends on the protocol selected in8-30 Protocol8-32 Baud Rate Set the baud rate. Note: The default baudrate depends on the protocol selected in8-30 Protocol8-33 Parity / StopBitsSet the parity and number of stop bits.Note: The default selection depends on theprotocol selected in 8-30 Protocol8-35 MinimumResponse DelaySpecify a minimum delay time betweenreceiving a request and transmitting aresponse. This can be used for overcomingmodem turnaround delays.8-36 MaximumResponse DelaySpecify a maximum delay time betweentransmitting a request and receiving aresponse.8-37 MaximumInter-Char DelaySpecify a maximum delay time betweentwo received bytes to ensure timeout iftransmission is interrupted.Table 7.27.1.4 EMC PrecautionsThe following EMC precautions are recommended in orderto achieve interference-free operation of the RS-485network.Relevant national and local regulations, for exampleregarding protective ground connection, must beobserved. The RS-485 communication cable must be keptaway from motor and brake resistor cables to avoidcoupling of high frequency noise from one cable toanother. Normally a distance of 200mm (8 inches) issufficient, but keeping the greatest possible distancebetween the cables is generally recommended, especiallywhere cables run in parallel over long distances. Whencrossing is unavoidable, the RS-485 cable must cross motorand brake resistor cables at an angle of 90 degrees.Serial com. bus cableBrake resistorMin. 200mm90° crossing130BA080.10Figure 7.4RS-485 Installation and Set... VLT® HVAC Drive Design Guide7-2 MG11BB22 - VLT® is a registered Danfoss trademark77