Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

Contents

4 Electrical Installation4.1 Electrical Installation4.1.1 Power ConnectionsCabling and fusingNOTICECables in GeneralAll cabling must comply with national and localregulations on cable cross-sections and ambienttemperature. UL applications require 75 °C copperconductors. 75 °C and 90 °C copper conductors arethermally acceptable for the frequency converter to usein non-UL applications.The power cable connections are located as shown inIllustration 4.1. Dimensioning of cable cross-section mustbe done in accordance with the current ratings and locallegislation. See chapter 7 General Specifications for details.If the frequency converter does not have built-in fuses, usethe recommended fuses to protect it. Seechapter 4.1.15 Fuse Specifications for recommended fuses.Always ensure that proper fusing is made according tolocal regulation.The mains connection is fitted to the mains switch if thisswitch is included.3 Phasepowerinput130BA026.1091 (L1)92 (L2)93 (L3)95 PEIllustration 4.1 Power Cable ConnectionsNOTICEThe motor cable must be screened/armoured. If anunscreened/unarmoured cable is used, some EMCrequirements are not complied with. To comply withEMC emission specifications, use a screened/armouredmotor cable. For more information, see EMC specifi-cations in the product-related design guide.See chapter 7 General Specifications for correctdimensioning of motor cable cross-section and length.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, continue the screen at the lowestpossible HF impedance.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). These connections are made byusing the supplied installation devices within thefrequency converter.Cable length and cross-sectionThe frequency converter has been EMC-tested with a givencable length. Keep the motor cable as short as possible toreduce the noise level and leakage currents.Switching frequencyWhen frequency converters are used together with sine-wave filters to reduce the acoustic noise from a motor, setthe switching frequency according to 14-01 SwitchingFrequency.Term.number96 97 98 99U V W PE1) Motor voltage 0–100% of mainsvoltage.3 wires out of motor.U1 V1 W1 PE1) Delta-connected.W2 U2 V2 6 wires out of motor.U1 V1 W1 PE1) Star-connected U2, V2, W2U2, V2 and W2 to be intercon-nected separately.Table 4.1 Motor Terminals1) Protected Ground ConnectionNOTICEIn 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 frequency converter output.Electrical Installation Operating Instructions36 Danfoss A/S © 08/2014 All rights reserved. MG11F50244