Danfoss VLT 5000 Operating Instructions Manual

Also see for VLT 5000 FLUX: Service manual Operating instructions Operating instructions Operating instructions Operating instructions

Danfoss VLT 5000 Operating Instructions Manual Manual pdf 12 page image

VLT® 5000/ 5000 FLUX/ 6000 HVAC/8000 AQUA PROFIBUSThe PROFIBUS optioncard Physical connectionThe PROFIBUS option card will be connected to thebus line (data line) at terminals 62 and 63. Data line"B" (TxD/RxD-P) will be connected to terminal 62 anddata line "A" (TxD/RxD-N) to terminal 63. A masterwith a voltaically insulated bus driver and overvoltageprotection (e.g. Z diode) is recommended. Protective measures for EMCIt is recommended to carry out the following protectivemeasures for EMC in order to ensure a trouble-freeoperation of the PROFIBUS network. Additional notesconcerning the subject of EMC can be found in theproject manual for the VLT 5000 series (MG.50.Cx.yy)and in the manual for the Profibus master.NB!:The applicable national and local regulations,for example with respect to protectiveearthing, must be observed. Cable connection FCM 300The PROFIBUS communication cable must be keptaway from motor and brake resistor cables to avoidcoupling of high frequency noise from one cable tothe other. Normally a distance of 200 mm is sufficient,but it is generally recommended to keep the greatestpossible distance between the cables, especially wherecables are running in parallel over long distances.If the PROFIBUS cable has to cross a motor andbraking resistance cable, it should occur at a 90° angle. Connection of the cable screeningThe shielding of the PROFIBUS cable always needsto be of a large-area, low-impedance type on bothsides. As a matter of principle, the screen should beput up with a large area and low impedance at allPROFIBUS stations. It is very important to have anearth connection with low impedance even at highfrequencies. This can be achieved by connecting theshield surface to earth, for example with the help ofa cable bow or a conductive cable connector.The frequency converter is equipped with variousterminals and supports in order to provide a flawlessshielding of the PROFIBUS cable. The shieldconnection is shown in the following diagram. EarthingIt is important to connect all stations linked to thePROFIBUS network to the same earth potential. Theearthing must have a low high-frequency impedance.This can be achieved by connecting a protectivehousing surface which is as large as possible toearth, for example by mounting the frequencyconverter to a conductive rear wall.Especially in the case of large distances between thestations of a PROFIBUS network, the additional use ofpotential equalization cables to connect the individualstations to the same earth potential may be necessary. Bus connection62 = RxD/TxD-P red cable63 = RxD/TxD-N green cableMG.90.G1.02 - VLT is a registered Danfoss trademark 11