A heat management system for an adjustable frequency drive, said adjustable frequency drive including a number of power modules , each said power module including a number of inverters , each said inverter including a number of power poles , said heat management system including: a housing assembly defining a power module enclosure and a liquid cooling assembly enclosure ; a first heat management assembly substantially disposed in said power module enclosure ; and a second heat management assembly which is not substantially disposed in said power module enclosure ; wherein: said first heat management assembly is a convection assembly ; and said second heat management assembly is a conduction with internal fluid flow assembly , including: a primary cold plate structured to support, and be thermally coupled to, said number of power poles ; said primary cold plate including a single inlet port and a single outlet port ; a heat exchanger including an inlet port and an outlet port ; a first conduit providing fluid communication between said heat exchanger outlet port and said primary cold plate inlet port ; and a second conduit providing fluid communication between said primary cold plate outlet port and said heat exchanger inlet port . a housing assembly defining a power module enclosure and a liquid cooling assembly enclosure ; a first heat management assembly substantially disposed in said power module enclosure ; and a second heat management assembly which is not substantially disposed in said power module enclosure ; wherein: said first heat management assembly is a convection assembly ; and said second heat management assembly is a conduction with internal fluid flow assembly , including: a primary cold plate structured to support, and be thermally coupled to, said number of power poles ; said primary cold plate including a single inlet port and a single outlet port ; a heat exchanger including an inlet port and an outlet port ; a first conduit providing fluid communication between said heat exchanger outlet port and said primary cold plate inlet port ; and a second conduit providing fluid communication between said primary cold plate outlet port and said heat exchanger inlet port . said first heat management assembly is a convection assembly ; and said second heat management assembly is a conduction with internal fluid flow assembly , including: a primary cold plate structured to support, and be thermally coupled to, said number of power poles ; said primary cold plate including a single inlet port and a single outlet port ; a heat exchanger including an inlet port and an outlet port ; a first conduit providing fluid communication between said heat exchanger outlet port and said primary cold plate inlet port ; and a second conduit providing fluid communication between said primary cold plate outlet port and said heat exchanger inlet port . a primary cold plate structured to support, and be thermally coupled to, said number of power poles ; said primary cold plate including a single inlet port and a single outlet port ; a heat exchanger including an inlet port and an outlet port ; a first conduit providing fluid communication between said heat exchanger outlet port and said primary cold plate inlet port ; and a second conduit providing fluid communication between said primary cold plate outlet port and said heat exchanger inlet port . <EOS>