Hi, I have 2 methods dependign on how desperate I am to drink the stuff.
If I am in no hurry, and don't mind the beer cloudy at first I set the reg to 280, or 40 psi and leave it for 36 hours...basically the keg is warm going in the fridge and the first 12 hours are chilling and also a bit of carbonation, the next 24 hours is when the main carbonation happens, so after a total of 36 hours you have a nice drop. Vent your keg to dispensing pressure and off you go. Will be cloudy at first bust after another few days will clear out nicely.
The second way, and this is handy when I keg one afteronn and need to drink the next day as it takes around 12 hours, but 24 is better to get your keg colder.
Put your warm keg in the fridge and cool for about 6-8 hours, or overninght is better. Connect your CO2 and set pressure at 280 again, then lie the keg on it's side with the gas "in" on the bottom so the CO2 is jetting directly into the beer and not into the headspace in the keg. Roll your keg and you will hear the gas pumping in, keep rolling gently for about 50 seconds. Turn off the main on your CO2, but leave the pressure reg on and then keep rolling your keg...you will see the pressure needle start to drop. The aim is to get it about 180 pressure, so if it stops below that mark then open up your CO2 again and repeat the rolling process for another 10 seconds or so. This should get you to 180 within a minute or 2. Your beer is now ready to drink. I have had warm keg to drinking in as little as 12 hours this way...again your beer will be cludy but only extra keg time and carbonation over time will clear. Taste is no different.
Bubba.