  We construct Drinfeld's second realization of the Yangian based on
psu(2|2)xR^3 symmetry. The second realization is traditionally more suitable
for deriving the quantum double and the universal R matrix with respect to the
first realization, originally obtained by Beisert, and it is generically more
useful in order to study finite dimensional representations. We show that the
two realization are isomorphic, where the isomorphism is almost the standard
one given by Drinfeld for simple Lie algebras, but needs some crucial
corrections to account for the central charges. We also evaluate the generators
of the second realization on the fundamental representation, finding the
interesting result that the rapidity variable for some generators gets boosted
by the energy eigenvalue.
