Ha... nobody I have met has been able to get that to work. I have a 70 amp charger.
Caveat - I have only done this once but it seems to work.
I set the max amp output to 5% of the battery bank (done so they batteries do not overheat and kick in the temperature compensation algorithm in the charger, lowering the output voltage), set the bulk and absorption voltage to same voltage recommended for equalizing my batteries and set the minimum bulk and absorption time values to the highest settings (I think its like 2 hours and 8 hours, respectively). Then start the charge. Monitor
When done, set the values back to their old settings.