Danfoss VLT 8000 AQUA series Operating Instructions Manual

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Danfoss VLT 8000 AQUA series Operating Instructions Manual Manual pdf 56 page image

VLT ® 8000 AQUA■ General information about electrical installation■ High voltage warningThe voltage of the frequency converteris dangerous whenever the equipment isconnected to mains. Incorrect installationof the motor or the frequency converter may causedamage to the equipment, serious personal injuryor death. Consequently, the instructions in theseOperating Instructions, as well as national andlocal safety regulations, must be complied with.Touching the electrical parts may be fatal - evenafter disconnection from mains:Using VLT 8006-8062, 200-240 V wait atleast 15 minutesUsing VLT 8006-8072, 380-480 V wait atleast 15 minutesUsing VLT 8102-8352, 380-480 V wait atleast 20 minutesUsing VLT 8452-8652, 380-480 V wait atleast 40 minutesUsing VLT 8002-8006, 525-600 V wait at least 4 minutesUsing VLT 8008-8027, 525-600 V wait atleast 15 minutesUsing VLT 8032-8302, 525-600 V wait atleast 30 minutesUsing VLT 8052-8402, 525-690 V wait atleast 20 minutesUsing VLT 8502-8652, 525-690 V wait atleast 30 minutesNB!:It is the user’s or certified electrician’sresponsibility to ensure correct earthing andprotection in accordance with applicablenational and local norms and standards.■ EarthingThe following basic issues need to be consideredwhen installing a frequency converter, so as to obtainelectromagnetic compatibility (EMC).• Safety earthing: Please note that the frequencyconverter has a high leakage current and mustbe earthed appropriately for safety reasons.Apply local safety regulations.• High-frequency earthing: Keep the earth wireconnections as short as possible.Connect the different earth systems at the lowestpossible conductor impedance. The lowest possibleconductor impedance is obtained by keeping theconductor as short as possible and by using thegreatest possible surface area. A flat conductor, forexample, has a lower HF impedance than a roundconductor for the same conductor cross-sectionC VESS . If more than one device is installed in cabinets,the cabinet rear plate, which must be made ofmetal, should be used as a common earth referenceplate. The metal cabinets of the different devicesare mounted on the cabinet rear plate using thelowest possible HF impedance. This avoids havingdifferent HF voltages for the individual devices andavoids the risk of radio interference currents runningin connection cables that may be used betweenthe devices. The radio interference will have beenreduced. In order to obtain a low HF impedance, usethe fastening bolts of the devices as HF connectionto the rear plate. It is necessary to remove insulatingpaint or similar from the fastening points.■ CablesControl cables and the filtered mains cable shouldbe installed separate from the motor cables soas to avoid interference overcoupling. Normally, adistance of 204mm (8 in) will be sufficient, but it isrecommended to keep the greatest possible distancewherever possible, especially where cables are installedin parallel over a substantial distance.With respect to sensitive signal cables, such astelephone cables and data cables, the greatestpossible distance is recommended with a minimumof 1m (3 ft) per 5m (15 ft) of power cable (mainsand motor cable). It must be pointed out that thenecessary distance depends on the sensitivity of theinstallation and the signal cables, and that thereforeno precise values can be stated.If cable jaws are used, sensitive signal cablesare not to be placed in the same cable jaws asthe motor cable or brake cable.If signal cables are to cross power cables, this shouldbe done at an angle of 90 degrees.Remember that all interference-filled in- oroutgoing cables to/from a cabinet should bescreened/armoured or filtered.■ Screened/armoured cablesThe screen must be a low HF-impedance screen.This is ensured by using a braided screen ofcopper, aluminium or iron. Screen armour intendedfor mechanical protection, for example, is notsuitable for an EMC-correct installation. Seealso Use of EMC-correct cables.MG.83.A2.02 - VLT is a registered Danfoss trademark56