Place Cooking Rack In Pressure Cooker. Add The Potatoes, Beans, Carrots, Broth, Onion And Salt. Place Ham Over Vegetables. Close Cover Securely; Place Pressure Regulator On Vent Pipe. Bring Cooker To Full Pressure Over High Heat. Reduce Heat To Medium-High And Cook For 4 Minutes. (Pressure Regulator Should Maintain A Slow Steady Rocking Motion; Adjust Heat If Needed.) Immediately Cool According To Manufacturer'S Directions Until Pressure Is Completely Reduced.