Danfoss VLT AutomationDrive FC 301 Design Manual

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Danfoss VLT AutomationDrive FC 301 Design Manual Manual pdf 134 page image

9.4 Motor ConnectionWARNINGINDUCED VOLTAGEInduced voltage from output motor cables that runtogether can charge equipment capacitors even with theequipment turned off and locked out. Failure to runoutput motor cables separately or use screened cablescould result in death or serious injury.• run output motor cables separately, or• use screened cablesMotor ConnectionNOTICETo comply with EMC emission specifications, screened/armoured cables are required. For more information, seechapter 5.2.1 EMC Test Results and Illustration 3.3.See chapter 6.2 General Specifications for correctdimensioning of motor cable cross-section and length.Term.no.96 97 98 99U V W PE1) Motor voltage 0-100% of mainsvoltage.3 wires out of motorU1 V1 W1 PE1) Delta-connectedW2 U2 V2 6 wires out of motorU1 V1 W1 PE1) Star-connected U2, V2, W2U2, V2 and W2 to be intercon-nected separately.Table 9.17 Terminal Descriptions1) Protected Ground ConnectionU1 V1 W1175ZA114.1196 97 98 96 97 98FC FCMotor MotorU2 V2 W2U1 V1 W1U2 V2 W2Illustration 9.29 Star and Delta ConnectionsNOTICEIn motors without phase insulation paper or otherinsulation reinforcement suitable for operation withvoltage supply (such as a frequency converter), fit a Sine-wave filter on the output of the frequency converter.Screening of cablesAvoid installation with twisted screen ends (pigtails). Theyspoil the screening effect at higher frequencies. If it isnecessary to break the screen to install a motor isolator ormotor contactor, the screen must be continued at thelowest possible HF impedance.NOTICEStrip a piece of the motor cable to expose the screenbehind the cable clamp, AND connect the groundconnection to terminal 99.Connect the motor cable screen to both the decouplingplate of the frequency converter and to the metal housingof the motor.Make the screen connections with the largest possiblesurface area (cable clamp). This is done by using thesupplied installation devices in the frequency converter.If it is necessary to split the screen to install a motorisolator or motor relay, the screen must be continued withthe lowest possible HF impedance.Cable-length and cross-sectionThe frequency converter has been tested with a givenlength of cable and a given cross-section of that cable. Ifthe cross-section is increased, the cable capacitance - andthus the leakage current - may increase, and the cablelength must be reduced correspondingly. Keep the motorcable as short as possible to reduce the noise level andleakage currents.Switching frequencyWhen frequency converters are used with Sine-wave filtersto reduce the acoustic noise from a motor, the switchingfrequency must be set according to the Sine-wave filterinstruction in 14-01 Switching Frequency.1. Fasten decoupling plate to the bottom of thefrequency converter with screws and washersfrom the accessory bag.2. Attach motor cable to terminals 96 (U), 97 (V), 98(W).3. Connect to ground connection (terminal 99) ondecoupling plate with screws from the accessorybag.4. Insert plug connectors 96 (U), 97 (V), 98 (W) (upto 7.5 kW) and motor cable to terminals labelledMOTOR.5. Fasten screened cable to decoupling plate withscrews and washers from the accessory bag.Electrical Installation VLT® AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW132 MG33BF02 - Rev. 2013-12-2099