Danfoss VLT AutomationDrive FC 302 Instruction Manual

Also see for VLT AutomationDrive FC 302: Service guide Programming guide Instruction manual Installation guide Operating guide

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Danfoss VLT AutomationDrive FC 302 Instruction Manual Manual pdf 38 page image

3.4.22 Switches S201, S202, and S801Use switches S201 (A53) and S202 (A54) to select a current(0–20 mA) or a voltage (-10 V to 10 V) configuration of theanalog input terminals 53 and 54 respectively.Switch S801 (BUS TER.) can be used to enable terminationon the RS-485 port (terminals 68 and 69).See Figure 3.26.Default setting:S201 (A53) = OFF (voltage input)S202 (A54) = OFF (voltage input)S801 (Bus termination) = OFFNOTICE!When changing the function of S201, S202 or S801 donot use force for the switch over. Remove the LCP cradlewhen operating the switches. The switches must not beoperated while the adjustable frequency drive ispowered.130BT310.11Figure 3.30 Remove the LCP Cradle to Access Switches3.4.23 Serial CommunicationRS-485 is a 2-wire bus interface compatible with multi-dropnetwork topology, i.e., nodes can be connected as a bus,or via drop cables from a common trunk line. A total of 32nodes can be connected to one network segment.Repeaters divide networkNOTICE!Each repeater functions as a node within the segment inwhich it is installed. Each node connected within a givennetwork must have a unique node address across allsegments.Terminate each segment at both ends using either thetermination switch (S801) of the adjustable frequencydrives or a biased termination resistor network. Always useshielded twisted pair (STP) cable for bus cabling, andalways follow good common installation practice.Low-impedance ground connection of the shield at everynode is important, including at high frequencies. Thus,connect a large surface of the shield to ground, forexample, with a cable clamp or a conductive cableconnector. It may be necessary to apply potential-equalizing cables to maintain the same ground potentialthroughout the network - particularly in installations withlong cables.To prevent impedance mismatch, always use the sametype of cable throughout the entire network. Whenconnecting a motor to the adjustable frequency drives,always use shielded motor cable.Cable Shielded twisted pair (STP)Impedance 120 ΩCable length Max. 4000 ft [1200 m] (including drop lines)Max. 1,650 ft [500 m] station-to-stationTable 3.13 Cable Recommendations3.5 Final Set-up and TestBefore operating the adjustable frequency drive, perform afinal test of the installation:1. Locate the motor nameplate to find out whetherthe motor is star (Y) or delta connected (Δ).2. Enter the motor nameplate data in the parameterlist. Access the list by pressing the [Quick Menu]key and selecting Q2 Quick Set-up. See Table 3.14.1. Motor Power [kW]or Motor Power [HP]1-20 Motor Power [kW]1-21 Motor Power [HP]2. Motor Voltage parameter 1-22 MotorVoltage3. Motor Frequency 1-23 Motor Frequency4. Motor Current parameter 1-24 MotorCurrent5. Motor Nominal Speed parameter 1-25 MotorNominal SpeedTable 3.14 Quick Set-up ParametersInstallation Instruction Manual36 Danfoss A/S © Rev. 2014-02-07 All rights reserved. MG37A22233