  Cen A hosts the closest active galactic nucleus to the Milky Way, which makes
it an ideal target for investigating the dynamical processes in the vicinity of
accreting supermassive black holes. In this paper, we present 14 Chandra HETGS
spectra of the nucleus of Cen A that were observed throughout 2022. We compared
them with each other, and contrasted them against the two previous Chandra
HETGS spectra from 2001. This enabled an investigation into the spectral
changes occurring on timescales of months and 21 years. All Chandra spectra
could be well fitted by an absorbed power law with a strong and narrow Fe
K$\alpha$ line, a leaked power law feature at low energies, and Si and S
K$\alpha$ lines that could not be associated with the central engine. The flux
of the continuum varied by a factor of $2.74\pm0.05$ over the course of the
observations, whereas the Fe line only varied by $18.8\pm8.8\%$. The photon
index increased over 21 years, and the Hydrogen column density varied
significantly within a few months as well. The Fe K$\alpha$ line was found at a
lower energy than expected from the Cen A redshift, amounting to an excess
velocity of $326^{+84}_{-94}~\mathrm{km}~\mathrm{s}^{-1}$ relative to Cen A. We
investigated warped accretion disks, bulk motion, and outflows as possible
explanations of this shift. The spectra also featured ionized absorption lines
from Fe XXV and Fe XXVI, describing a variable inflow.
