Eaton XC200 Series User Manual

10/10 MN05003004Z-EN172 EngineeringControl panel layoutThe layout of the components inside the control panel is a majorfactor for achieving interference-free functioning of the plant ormachinery. During the project planning and design phase, as wellas its implementation, care must be taken that the power andcontrol sections are separated. The power section includes:• Contactors,• Coupling/interfacing components,• Transformers,• Frequency inverters,• Converters.In order to effectively exclude any electromagnetic contamination,it is a good idea to divide the system into sections, according totheir power and interference levels. In small switchgear cabinets itis often enough to provide a sheet steel dividing wall, to reduceinterference factors.VentilationIn order to ensure sufficient ventilation a minimum clearance of50 mm to passive components must be observed. If theneighbouring components are active elements, such as powersupplies or transformers, then the minimum spacing should be75 mm. The values that are given in the technical data must beobserved.Layout of unitsBuild the module racks and the controls into the switchgearcabinet in a horizontal position:Preventing interferenceCable routing and wiringCables are divided into the following categories:• Electric power lines (e.g. power lines carrying high currents, orlines to converters, contactors, solenoid valves)• Control and signal cables: (e.g. digital input lines)• Measurement and signal cables (e.g. fieldbus connections)Take care to implement proper cable routing both inside andoutside the control panel, to keep interference as low as possible:X Avoid parallel routing of sections of cable in different powercategories.X As a basis rule, keep AC cable separated from DC cables.X Keep to the following minimum spacing:– at least 10 cm between power cables and signal cables;– at least 30 cm between power cables and data or analogcables.– When routing cables, make sure that the outgoing and returnleads of a circuit pair are routed together: The currentsflowing in opposite directions thus cancel each other out asa summation. The generated electromagnetic fields canceleach other out.Suppressor circuitry for interference sourcesX All suppressor circuitry should be wired in as close to the sourceof interference (contactors, relays, solenoids) as possible.ShieldingX Use shielded cables for the connections to the data interfaces.The general rule is: the lower the coupling impedance, thebetter the shielding effect.Figure 17: Control panel layouta Spacing > 50 mmb Spacing > 75 mm to active elementsc Cable ductcbabababah Always route power cables and control cables as far apartas possible. This avoids capacitive and inductive coupling.If separate routing is not possible, then the first prioritymust be to shield the cable responsible for theinterference.h Switched inductors should always have suppressorcircuitry fitted.