EL9570 Beckhoff
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MPN: EL9570-0000
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The Beckhoff EL9570 is part of the EL EtherCAT Terminals series and features a 2-point ballast control with a ballast resistance of 10 Ohms. It has a nominal voltage of 50 V, a capacity of 500 microfarads, and offers surge voltage protection above 56 V. The terminal supports a ripple current of 10 A and has an IP20 protection class.
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Product Description:
The EL9570 is an energy storage and overvoltage-limiting unit produced by Beckhoff within the EL EtherCAT Terminals series. Installed alongside DC supply lines on a 24 V control bus, the terminal absorbs transient energy and smooths voltage fluctuations so connected I/O modules remain powered during load steps or line dips. By integrating directly into the fieldbus segment, the device helps keep cabinet wiring short and maintain distributed power integrity inside automated systems.
The electrolytic capacitor inside the terminal has a storage capacity of 500 μF, giving the circuit a modest energy reserve that covers brief power gaps without an external buffer module. During normal operation, the capacitor has a nominal working voltage of 50 V, which is the maximum continuous DC voltage that may be applied to the capacitor bank. The ripple current from the bus can reach 10 A, indicating how much alternating current the unit can accommodate without overheating. An active clamping stage monitors line excursions and intervenes when the bus deviates by more than ±2 V from the preset level. An internal surge path engages if the voltage rises above 56 V, redirecting excess energy to protect connected equipment. A fixed ballast resistance of 10 Ω limits the initial inrush current and helps prevent upstream supply fuses from tripping during startup.
Total series resistance inside the module remains below 10 mΩ, minimizing power dissipation so most of the stored energy remains available to the load. The housing snaps onto a 35 mm mounting rail, and its IP20 rating provides touch protection but does not protect the terminal against water. A two-point ballast control topology monitors capacitor charging and discharging, while the variable installation position supports horizontal or vertical cabinet layouts. The terminal has no protective earth contact because its circuitry is internally referenced to the local 0 V supply conductor. This arrangement allows the module to connect to the control bus without requiring a separate protective earth connection at the terminal.
