In the absence of any scaling, bandwidth overflow would occur for SWU when CURBW > BWMAX and underflow would occur when CURBW < BWMIN. Suppose scaling is set to say 1:100 and BWMAX is set to 2. After 275 transactions CURBW would still be 2 and equal to BWMAX, this would however trigger a Bandwidth overflow as the actual number of transactions is greater than 200 (2*100). The code can then be rerun with a smaller scaling setting to analyze the cause for overflow.