Eaton M-Max Series User Manual

Also see for MMX11 Series: Installation instructions Operating instructions

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Installation30 M-Max Series Adjustable Frequency Drive MN04020003E—October 2013 www.eaton.comEMC InstallationThe responsibility to comply with the legally stipulated limitvalues and thus the provision of electromagneticcompatibility is the responsibility of the end user or systemoperator. This operator must also take measures to minimizeor remove emissions in the environment concerned (seefigure on Page 22). He must also use means to increase theinterference immunity of the system devices.In a drive system (PDS) with frequency inverters, you shouldtake measures for electromagnetic compatibility (EMC) whiledoing your planning, because changes or improvements tothe installation site, which are required in the installation orwhile mounting, are normally associated with additionalhigher costs.The technology and system of a frequency inverter cause theflow of high frequency leakage current during operation. Allgrounding measures must therefore be implemented withlow impedance connections over a large surface area.With leakage currents greater than 3.5 mA, in accordancewith VDE 0160 or EN 60335, either● the protective conductor must have a cross-section10 mm2● the protective conductor must be open-circuit monitored,or● the second protective conductor must be fittedFor an EMC-compliant installation, we recommend thefollowing measures:● Installation of the frequency inverter in a metallic,electrically conducting enclosure with a good connectionto earth● Shielded motor cables (short cable lengths)Ground all conductive components and housings in a drivesystem using as short a line as possible with the greatestpossible cross-section (Cu-braid).EMC Measures in the Control PanelFor EMC-compatible installation, connect all metallic parts ofthe device and the switching cabinet together over broadsurfaces and so that high-frequencies will be conducted.Mounting plates and cabinet doors should make goodcontact and be connected with short HF-braided cables.Avoid using painted surfaces (anodized, chromized). Anoverview of all EMC measures is provided in the figure onPage 31.Install the frequency inverter as directly as possible (withoutspacers) on a metal plate (mounting plate).Route input and motor cables in the switch cabinet as closeto the ground potential as possible. This is because freemoving cables act as antennas.When laying HF cables (for example, shielded motor cables)or suppressed cables (for example, input supply cables,control circuit and signal cables) in parallel, a minimumclearance of 11.81 in (300 mm) should be ensured in order toprevent the radiation of electromagnetic energy. Separatecable routing should also be ensured when large voltagepotential differences are involved. Any necessary crossedcabling between the control signal and power cables shouldalways be implemented at right angles (90 degrees).Never lay control or signal cables in the same duct as powercables. Analog signal cables (measured, reference andcorrection values) must be shielded.EarthingThe ground connection (PE) in the cabinet should beconnected from the input supply to a central earth point(mounting plate). All protective conductors should be routedin star formation from this earth point and all conductivecomponents of the PDS (frequency inverter, motor reactor,motor filter, main choke) are to be connected.Avoid ground loops when installing multiple frequencyinverters in one cabinet. Make sure that all metallic devicesthat are to be grounded have a broad area connection withthe mounting plate.Screen Earth KitCables that are not shielded work like antennas (sending,receiving). Make sure that any cables that may carrydisruptive signals (for example, motor cables) and sensitivecables (analog signal and measurement values) are shieldedapart from one another with EMC-compatible connections.The effectiveness of the cable shield depends on a goodshield connection and a low shield impedance.Use only shields with tinned or nickel-plated copper braiding.Braided steel shields are unsuitable.Control and signal lines (analog, digital) should always begrounded on one end, in the immediate vicinity of the supplyvoltage source (PES).