Danfoss vlt aqua Design Manual

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

Contents

Danfoss vlt aqua Design Manual Manual pdf 150 page image

5.4 Connections - Frame sizes D, E and F5.4.1 Power ConnectionsCabling and FusingNOTE!Cables GeneralAll cabling must comply with national and local regulations on cable cross-sections and ambient temperature. Copper (167°F [75°C])conductors are recommended.The power cable connections are situated as shown below. Dimensioning of cable cross-section must be done in accordance with the current ratings andlocal legislation. See theSpecifications section for details.For protection of the adjustable frequency drive, the recommended fuses must be used or the unit must be with built-in fuses. Recommended fuses canbe seen in the tables of the fuse section. Always ensure that proper fusing is made according to local regulation.The AC line input connections are fitted to the line power switch if this is included.NOTE!The motor cable must be shielded/armored. If an unshielded/unarmored cable is used, some EMC requirements are not complied with.Use a shielded/armored motor cable to comply with EMC emission specifications. For more information, seeEMC specifications in theDesign Guide.See sectionGeneral Specifications for correct dimensioning of motor cable cross-section and length.Shielding of cables:Avoid installation with twisted shield ends (pigtails). They spoil the shielding effect at higher frequencies. If it is necessary to break the shield to installa motor isolator or motor contactor, the shield must be continued at the lowest possible HF impedance.Connect the motor cable shield to both the de-coupling plate of the adjustable frequency drive and to the metal housing of the motor.Make the shield connections with the largest possible surface area (cable clamp). This is done by using the supplied installation devices within theadjustable frequency drive.Cable-length and cross-section:The adjustable frequency drive has been EMC tested with a given length of cable. Keep the motor cable as short as possible to reduce the noise leveland leakage currents.Switching frequency:When adjustable frequency drives are used together with sine-wave filters to reduce the acoustic noise from a motor, the switching frequency must beset according to the instructions in par. 14-01Switching Frequency.5 How to Install VLT® AQUA Drive Design Guide5-32 MG.20.N5.22 - VLT® is a registered Danfoss trademark5