Variable speed drive for energy-optimized speed control of pump, compressor and fan motors in building control applications, including: Powermodule PM230, ControlUnit CU230P-2 BT with screening plate without panel.When using a screening kit for the Power Module the total height increases as follows: FSA: 80 mm; FSB: 78 mm; FSC: 77 mm; FSD, FSE, FSF: 123 mm. The depth increases when using a BOP-2 by 10 mm, and with an IOP 20 mm.