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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. 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. This configuration reduces harmonics the supply network. the active mode the IGBTs are con­ trolled keep the voltage constant and the line current sinusoidal. Thyristor Supply Unit (TSU) A thyristor supply unit used regenerative drive systems convert three-phase voltage DC voltage. 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. The main circuit consists main switch, filter and a converter. The control unit is equipped with communication interfaces, power supplies and the front-devices necessary for the automation equipment. the passive mode the converter operates as the rectifier. The converter hardware compatible with drive units. 12-pulse bridge configuration can implemented with two thyristor supply units supplied three-winding transformer. A fully regenerative IGBT Supply Unit with power factor requires power compensation. The control performance excel­ lent due the ultra-fast control technology, the same as DTC.3. power control gives the same firm but gentle performance DTC gives motor control. ■ IGBT Supply Unit (ISU) An IGBT Supply Unit used regenerative drive systems convert three-phase voltage DC voltage. 3AFE 68248531 REV 31. The control also provides near unity power factor. Standard braking resistors are separately available in their own cabinets. Harmonic content remains extremely low due DTC control and LCL filtering.2004. The Thyristor Supply Unit contains two 6-pulse thyristor bridges antiparallel connection. It has the ability regenerate back the mains, provid­ ing considerable energy savings with applications having excessive braking powers. AC800M Control Unit (Optional) The Multidrive concept also includes the control unit for the AC800M and S800 I/O. The unit can also boost motor voltage when line voltage low