jats:titleAbstract</jats:title> jats:pWe present the results from a coordinated XMM-Newton + NuSTAR observation of the Seyfert 1 galaxy ESO 511−G030. With this joint monitoring program, we conduct a detailed variability and spectral analysis. The source remained in a low flux and very stable state throughout the observation period, although there are slight fluctuations of flux over long timescales. The broadband (0.3–78 keV) spectrum shows the presence of a power-law continuum with a soft excess below 2 keV, a relatively narrow iron Kjats:italicα</jats:italic> emission (∼6.4 keV), and an obvious cutoff at high energies. We find that the soft excess can be modeled by two different possible scenarios: a warm (jats:italickT</jats:italic> jats:sube</jats:sub> ∼ 0.19 keV) and optically thick (jats:italicτ</jats:italic> = 18–25) Comptonizing corona or a relativistic reflection from a high-density (jats:inline-formula jats:tex-math

</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> mml:milog</mml:mi> <mml:mo stretchy="false">[</mml:mo> mml:msub mml:mrow mml:min</mml:mi> </mml:mrow> mml:mrow <mml:mi mathvariant="normal">e</mml:mi> </mml:mrow> </mml:msub> mml:mrow <mml:mo stretchy="true">/</mml:mo> </mml:mrow> mml:msup mml:mrow mml:micm</mml:mi> </mml:mrow> mml:mrow mml:mo−</mml:mo> mml:mn3</mml:mn> </mml:mrow> </mml:msup> <mml:mo stretchy="false">]</mml:mo> mml:mo=</mml:mo> mml:mn17.1</mml:mn> mml:mo–</mml:mo> mml:mn18.5</mml:mn> </mml:math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjacc38fieqn1.gif" xlink:type="simple" /> </jats:inline-formula>) inner disk. All models require a low temperature (jats:italickT</jats:italic> jats:sube</jats:sub> ∼ 13 keV) for the hot corona.</jats:p>