KEB COMBIVERT Series Getting Started

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KEB COMBIVERT Series Getting Started Manual pdf 11 page image

21ANTRIEBSTECHNIK; A system should be broadly separated into power section and control section,whether comprising a single enclosure or multiple enclosures. It is recommendedthat a screen wall is installed between the two sections because of the radiatednoise from the power section. This screen must be in good metal-to-metal contactwith the mouting plate (remove galvanized or lacquer finish), over as large an areaas possible.; The installed inverter and a superposed interference suppression filter must forma unit, i.e. they must, for example, be connected to each other without an insulatinglayer of lacquer and cover the mounting plate evenly.; The connecting line between interference suppression filter and inverter should bea shielded line installed on both sides and usually be no longer than 30 cm.; The mounting plate of the inverter must be seen as the neutral point for the entireearthing and shield connection in the machine or system. If the motor or othersystem parts lead to disturbances, then the HF-connection of these elements isbad. In this case equipotential bonding must be done.; A good connection of the shield onto the motor terminal box is only given, when theterminal box is made out of metal, and a metal cable gland is used to connect thescreen. When using a plastic box, provide the shield without elongation with a cablelug and connect directly with the earthing point.; The leakage currents in the circuit increase when interference suppression filtersare used. Since these lie above the 3,5mA threshold, one of the following conditionsmust be met:• Protective conductor section at least 10 mm² copper• Monitoring of the protective conductor by a device that independently switchesoff under fault conditions.• Install a second conductor electrically parallel to the protective conductor viaseparate terminals.; Place consumers generating electric or magnetic fields or affecting the voltagesupply as far away as possible and take measures to suppress the interference.; The service life of the frequency converter / servo drive with intermediate voltagecircuit depends on the current load of the electrolytic capacitors in the intermediatecircuit. The use of mains chokes can increase the service life of the condensatorsto a considerable extent, especially when connecting to „hard“ power systems orwhen under permanent drive load (continuous duty).For continuous duty (S1) drives with a medium duty of >60% , KEB recommendsthe use of mains chokes with a terminal voltage (Uk) of 4%.The term “hard” mains can be defined as follows:The inverter’s nominal power (Sn) is very low compared to the nodal point power(Smains) .k = Smains / Sn >> 200 e.g. Sn = 6.6 kVA 12.F4Smains = 2 MVA supply transformer––> k = 330––> Choke required; When using a mains choke, it should usually be mounted on the mains side of theinterference suppression filter.3.4 Explanations

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