Vacon NX User Manual
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Contents
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1vacon • 8 SAFETY1.3 Cautions1.4 Earthing and earth fault protectionThe Vacon NX Liquid-Cooled frequency converter must always be earthed with an earthingconductor connected to the earthing terminal . See page 81.The earth leakage current of Vacon NX_ exceeds 3.5 mA AC. According to EN 61800-5-1, one ormore of the following conditions for the associated protective circuit shall be satisfied:a. The protective conductor shall have a cross-sectional area of at least 10 mm 2 Cu or 16 mm 2Al, through its total run.b. Where the protective conductor has a cross-sectional area of less than 10 mm 2 Cu or 16mm2 Al, a second protective conductor of at least the same cross-sectional area shall beprovided up to a point where the protective conductor has a cross-sectional area not lessthan 10 mm2 Cu or 16 mm 2 Al.c. Automatic disconnection of the supply in case of loss of continuity of the protective conductor.The cross-sectional area of every protective earthing conductor which does not form part of thesupply cable or cable enclosure shall, in any case, be not less than:• 2.5 mm 2 if mechanical protection is provided or• 4 mm 2 if mechanical protection is not provided.The earth fault protection inside the frequency converter protects only the converter itself againstearth faults in the motor or the motor cable. It is not intended for personal safety.Due to the high capacitive currents present in the frequency converter, fault current protectiveswitches may not function properly.Do not perform any voltage withstand tests on any part of Vacon NX_. There is acertain procedure according to which the tests shall be performed. Ignoring thisprocedure may result in damaged product.Do not touch the components on the circuit boards. Static voltage discharge maydamage the components.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 fire protection, notfor touch protection in grounded systems.13006.emf13006.emfPhone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com |
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