  We present the results of a comprehensive investigation on the evolution of
spectral and timing properties of the Galactic black hole candidate 4U 1630--47
during its spectral transitions. In particular, we show how a scaling of the
correlation of the photon index of the Comptonized spectral component Gamma
with low frequency of quasi-periodic oscillations (QPO), nu_L and mass
accretion rate, $\dot M$ can be applied to the black hole mass and the
inclination angle estimates. We analyze the transition episodes observed with
the {\it Rossi} X-ray Timing Explorer (RXTE) and BeppoSAX satellites. We find
that the broadband X-ray energy spectra of 4U~1630--47 during all spectral
states can be modeled by a combination of a thermal component, a Comptonized
component and a red-skewed iron line component. We also establish that Gamma
monotonically increases during transition from the low-hard state to the
high-soft state and then saturates for high mass accretion rates. The index
saturation levels vary for different transition episodes. Correlations of Gamma
versus nu_L also shows saturation at Gamma ~ 3. Gamma-Mdot and Gamma-nu_L
correlations with their index saturation revealed in 4U~1630--47 are similar to
those established in a number of other BHCs and can be considered as an
observational evidence for the presence of a black hole in these sources. The
scaling technique, which relies on XTE J1550--564, GRO 1655-40 and H 1743-322
as reference sources, allows us to evaluate a black hole mass in 4U~1630--47
yielding M_{BH}~10+/- 0.1 solar masses, and to constrain the inclination angle
of i< 70 degrees.
