Danfoss VLT 2800 Design Manual

Also see for VLT 2800: Operating instructions Manual Instruction manual Quick guide Installation instructions

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Danfoss VLT 2800 Design Manual Manual pdf 42 page image

lation and the sensitivity of the signal cables. For thisreason, exact values cannot be given.When being placed in cable trays, sensitive cables may notbe placed in the same cable tray as the motor cable. Ifsignal cables run across power cables, this is done at anangle of 90 °. Only use screened/armoured noise-filledinlet and outlet cables to a cabinet.See also chapter 3.3.7 EMC-correct Electrical Installation.3.3.4 Screened/armoured CablesThe screen must have low HF impedance, which isachieved by a braided screen of copper, aluminium or iron.Screen reinforcement intended for mechanical protection,for example, is not suitable for EMC-correct installation.See also chapter 3.3.8 Use of EMC Compliant Cables.3.3.5 Extra ProtectionRCD relays, multiple protective earthing or grounding canbe used as extra protection, provided that local safetyregulations are complied with. If a ground fault occurs, aDC content may develop in the faulty current. Never usean RCD (ELCB relay), type A, as it is not suitable for DCfaulty currents. If RCD relays are used, comply with localregulations.If RCD relays are used, they must be:• Suitable for protecting equipment with a DCcontent in the faulty current (3-phase bridgerectifier).• Suitable for a pulse-shaped, brief discharge onpower-up.• Suitable for a high leakage current.N must be connected before L1 for single-phase 200 Vreduced leakage current units (type code R4).3.3.6 High Voltage TestA high-voltage test can be performed by short-circuitingterminals U, V, W, L1, L2 and L3, and applying max. 2160 VDC in 1 s between this short-circuit and terminal 95.WARNINGDo not perform a high-voltage test between the controlterminals and the chassis, because the voltage potentialof the control card cannot exceed approximately 100 Vwith respect to chassis due to a voltage limiting circuitry.Performing such a test may lead to equipment damageand personal injuries.The terminals are protected against direct hazardousaccess through barriers.Installation Design Guide40 Danfoss A/S © Rev. May/2014 All rights reserved. MG27E40233