Vacon nx User Manual

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Vacon nx User Manual Manual pdf 9 page image

SAFETY vacon • 924-hour support +358 (0)201 212 575 • Email: vacon@vacon.com 11.3 Cautions1 Do not perform any voltage withstand tests on any part of Vacon NX_. Thereis a certain procedure according to which the tests shall be performed.Ignoring this procedure may result in damaged product.2 Do not touch the components on the circuit boards. Static voltage dischargemay damage the components.3 If a fault protection relay is used , it must be of at least type B, preferably B+( according to EN 50178) , with a trip level of 300 mA. This is for fireprotection, not for touch protection in grounded systems.1.4 Earthing and earth fault protectionThe Vacon NX_ frequency converter must always be earthed with an earthing conductor connected to theearthing terminal .The earth leakage current of Vacon NX_ exceeds 3.5mA AC. According to EN61800-5-1, one or more of thefollowing measures shall be applied, unless the touch current can be shown to be less than 3.5 mA AC or10 mA DC:A fixed connection anda. The protective earthing conductor shall have a cross-sectional area of at least 10 mm2 Cu or 16mm2 Al,orb. an automatic disconnection of the supply in case of loss of continuity of the protectiveearthing conductor.See chapter 6.orc. provision of an additional terminal for a second protective earthing conductor of the same cross-sectional area as the original protective earthing conductor,Cross-sectional area of phase conductors[mm2]Minimum cross-sectional area of the cor -responding protective earthing conductor[mm2]S ≤ 1616 < S ≤ 3535 < SS16S/2The values above are valid only if the protective earthing conductor is made of the same metal as the phaseconductors. If this is not so, the cross-sectional area of the protective earthing conductor shall be determinedin a manner which produces a conductance equivalent to that which results from the application of this table.Table 1. Protective earthing conductor cross-sectionThe cross-sectional area of every protective earthing conductor which does not form part of the supplycable or cable enclosure shall, in any case, be not less than:- 2,5mm2 if mechanical protection is provided or- 4mm2 if mechanical protection is not provided. For cord-connected equipment, provisionsshall be made so that the protective earthing conductor in the cord shall, in the case offailure of the strain-relief mechanism, be the last conductor to be interrupted.