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HST™ 20 Turbocompressor <br />A highly efficient and reliable single-stage centrifugal compressor for <br />the provision of oil-free, low-pressure air. <br />Construction <br />High-speed electric motor <br />A vertically mounted high-frequency electric motor for variable speed <br />operation. The motor is air-cooled by an integrated shaft mounted <br />fan and the windings are protected by Pt100-sensors monitored by <br />the local control system. <br />Air end <br />The impeller has been designed to optimize performance and is <br />machined from a solid piece of high-strength aluminum alloy. The <br />volute and other main components are made from cast aluminum. <br />A non-contact seal between air-end and motor minimizes losses to <br />maintain high efficiency. <br />Variable frequency drive <br />Flow control is provided by a built-in variable frequency drive which <br />also accommodates variations in outlet pressure and ambient inlet <br />conditions. The variable frequency drive’s soft-start facility eliminates <br />peak starting currents. <br />Active magnetic bearings <br />Two radial bearings and two axial bearings support the rotor. The <br />magnetic bearing controller uses data provided by multiple sensors <br />to continuously manage the position of the rotor. <br />Blow-off valve <br />The blow-off valve is mounted within the acoustic enclosure with <br />further attenuation provided by an integrated silencer. <br />Acoustic enclosure <br />The enclosure provides protection for the electrical and mechanical <br />components and provides efficient noise attenuation for the <br />machine. The enclosure is constructed from zinc-plated steel. It is <br />suitable for indoor use (IP 33D / NEMA 2). <br />Integrated components <br />The inlet filters for process and cooling air, inlet silencer, discharge <br />silencer, and motor cooling air silencer are all integrated into the main <br />assembly. <br />Compressor Control <br />Local control <br />The built-in local Human-Machine-Interface (HMI) provides control <br />and monitoring for the safe and efficient operation of the machine. <br />Flow may be controlled directly by the operator, or alternatively, the <br />turbocompressor can follow a given reference value. The local HMI <br />uses a color touch screen to provide access to the operator. <br />Connections <br />Analog and digital control and monitoring connections are built in. <br />Fieldbus connections such as Profibus, Profinet, Modbus RTU, <br />Modbus TCP, and Ethernet IP are available as options. <br />Remote connections <br />A secure connection facilitating service and monitoring can be <br />ordered as an option. <br />0 1000 2000 3000 4000 50000 <br />5 <br />10 <br />15 <br />Qv [scfm]∆p [psi]HST 20−4500−1−U200 <br />HST 20−4500−1−U150 <br />0 1000 2000 3000 4000 50000 <br />5 <br />10 <br />15 <br />Qv [scfm]∆p [psi]HST 20−6000−1−U250 <br />HST 20−6000−1−U200 <br />HST 20−6000−1−U150 <br />37