Frekvenční měniče Katalogy, manuály (EN+CZ)

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Vydal: ABB s.r.o, ELSYNN Autor: ABB ELSYnn

Strana 45 z 825







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2004. This configuration reduces harmonics the supply network. Thyristor Supply Unit (TSU) A thyristor supply unit used regenerative drive systems convert three-phase voltage DC voltage. The control unit is equipped with communication interfaces, power supplies and the front-devices necessary for the automation equipment.. Standard braking resistors are separately available in their own cabinets. power control gives the same firm but gentle performance DTC gives motor control. The Thyristor Supply Unit contains two 6-pulse thyristor bridges antiparallel connection. The control also provides near unity power factor. AC800M Control Unit (Optional) The Multidrive concept also includes the control unit for the AC800M and S800 I/O. The converter hardware compatible with drive units. the passive mode the converter operates as the rectifier. The control performance excel­ lent due the ultra-fast control technology, the same as DTC. 12-pulse bridge configuration can implemented with two thyristor supply units supplied three-winding transformer. The unit can also boost motor voltage when line voltage low. Harmonic content remains extremely low due DTC control and LCL filtering. Dynamic Braking Unit (DBU) In resistor braking whenever the voltage the inter­ mediate circuit frequency converter exceeds a certain limit, braking chopper connects the circuit to a braking resistor. Non-standard resistors can used providing that the specified resistance value not decreased and that the heat dissipation capacity the resistor sufficient for the drive application.3. ■ IGBT Supply Unit (ISU) An IGBT Supply Unit used regenerative drive systems convert three-phase voltage DC voltage. A fully regenerative IGBT Supply Unit with power factor requires power compensation. It has the ability regenerate back the mains, provid­ ing considerable energy savings with applications having excessive braking powers. The main circuit consists main switch, filter and a converter. 3AFE 68248531 REV 31. the active mode the IGBTs are con­ trolled keep the voltage constant and the line current sinusoidal