  We report results of five pointed BeppoSAX observations of the black hole
candidate 4U 1630-47 during part of its 1998 outburst when the 2-10 keV source
luminosity decreased from 2.1x10^38 erg/s (for an assumed distance of 10 kpc)
by a factor of ~7. The 2-200 keV spectrum can be modeled by a soft
multi-temperature disk blackbody and a hard power-law. During four of the
observations, there is evidence for deviations from a pure power-law shape >~20
keV which may be due to reflection. As the outburst decayed a number of
spectral trends are evident: (1) the amount of photoelectric absorption
decreased, (2) the spectrum became harder (i.e. the power-law index became
smaller), (3) the temperature of the disk blackbody decreased and (4) the
inferred inner disk radius increased by a factor of ~4. The change in the
accretion disk inner radius during the outburst is in contrast to results from
other soft X-ray transients. We find that the disk blackbody temperature
depends on the inner disk radius roughly as T=r^(-3/4). For a standard
Shakura-Sunyaev disk model this implies that the inferred mass accretion rate
at the inner disk radius did not change appreciably during the part of the
outburst observed by BeppoSAX.
