By Karen Brettell and Amanda Cooper NEW YORK/LONDON (Reuters) – The dollar edged up against the euro on Wednesday ahead of the conclusion of a Federal Reserve policy meeting that could offer some insight into when the U.S. central bank will begin lowering interest rates. The main market focus will be on Fed officials’ updated economic and interest rate projections, with the U.S. central bank expected to leave rates unchanged for the third consecutive meeting. “The question is when the Fed cuts and why,” said Marc Chandler, chief market strategist at Bannockburn Global Forex in New York. “The f…