ABB ACS880 Series Electrical Planning Instructions

Also see for ACS880 Series: Quick start up guide Quick start guide User manual Electrical planning instructions Supplement

Contents

ABB ACS880 Series Electrical Planning Instructions Manual pdf 24 page image

Selecting the power cables￭ General rulesSelect the input power and motor cables according to local regulations. Obey these rules:• Select a cable capable of carrying the drive (or motor) nominal current.• Select a cable rated for at least 70 °C (158 °F) maximum permissible temperature ofconductor in continuous use.1)• The inductance and impedance of the PE conductor/cable (grounding wire) must berated according to permissible touch voltage appearing under fault conditions (so thatthe fault point voltage will not rise excessively when a ground fault occurs). See below.• 600 V AC cable is accepted for up to 500 V AC. 750 V AC cable is accepted for up to600 V AC. For 690 V AC rated equipment, the rated voltage between the conductorsof the cable should be at least 1 kV.1)1) In an US installation, obey the specification in section Additional US requirements (page 27).We recommend symmetrical shielded cable for the motor cabling. The use of symmetricalshielded cable reduces electromagnetic emission as well as the stress on motor insulation,bearing currents and wear. See subsection Alternative power cable types (page 25).The protective conductor must always have an adequate conductivity. Unless local wiringregulations state otherwise, the cross-sectional area of the protective conductor must agreewith the conditions that require automatic disconnection of the supply required in 411.3.2.of IEC 60364-4-41:2005 and be capable of withstanding the prospective fault current duringthe disconnection time of the protective device. The cross-sectional area of the protectiveconductor can either be selected from the table below or calculated according to 543.1 ofIEC 60364-5-54.This table shows the minimum cross-sectional area related to the phase conductor sizeaccording to IEC 61800-5-1 when the phase conductor and the protective conductor aremade of the same metal. If this is not so, the cross-sectional area of the protective earthingconductor shall be determined in a manner which produces a conductance equivalent tothat which results from the application of this table.Minimum cross-sectional area of the correspondingprotective conductorSp (mm2)Cross-sectional area of the phase conductorsS (mm2)S 1) , 2)S ≤ 161616 < S ≤ 35S/235 < S1) IEC/EN 61800-5-1:• use a protective earth conductor with a cross-section of at least 10 mm2 Cu or 16 mm2 Al, or• use a second protective earth conductor of the same cross-sectional area as the original protective earthing conductor, or• use a device which automatically disconnects the supply if the protective earth conductor breaks.2) IEC/EN 61800-5-1: If the protective earth conductor is separate (ie, it does not form part of the input power cable or the input power cableenclosure), the cross section must be at least:• 2.5 mm2 when the conductor is mechanically protected, or• 4 mm2 when the conductor is not mechanically protected.￭ Typical power cable sizesSee technical data for the typical power cable sizes for each drive or unit type.24 Electrical planning guidelines