Vacon NX User Manual
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ACTIVE FRONT END (NXA) vacon • 1651010.9 ParellingThe power of the input group can be increased by connecting several Active Front End units inparallel. Paralleling refers to Active Front End units connected in the same input transformer.Active Front End units of different power ratings can also be connected in parallel. Nocommunication between the units is required; they work independently. Vacon's standard LCLfilters must be used for paralleling. If filters other than Vacon's standard LCL filters are used inActive Front End units connected in parallel, too large circulation currents may be generatedbetween the Active Front End units. All Active Front units must be set for 5% drooping and PWMSynch must be set for Enable. See the Application manual for specific parameter settings.Each Active Front End unit connected in parallel must have its own short-circuit protection on ACand DC sides. The fuses are selected in accordance with Section x-x. When paralleling, attentionmust be paid to the sufficient short-circuit capacity of the system.The derating of Active Front End units connected in parallel is 5% of the DC power; this should betaken into account when selecting the input unit.If a device is to be isolated from the AC and DC voltages, and other Active Front End units connectedin parallel are also to be used, separate isolators are required in the AC input and DC output. TheAC input can be isolated using a compact circuit-breaker, an ordinary circuit-breaker or a fuseswitch. Contactors are not suitable for isolating the AC input because they cannot be locked in thesafe position. The DC output can be isolated using a fuse switch. The pre-charging circuit must alsobe isolated from the AC input. A load isolation switch or safety isolation switch can be used for this.The device can also be connected to mains even when the other devices connected in parallel arealready connected and running. In such a case, the isolated deice must first be pre-charged. Whenthat is done, the AC input can be switched on. After this, the device can be connected to theintermediate DC circuit.Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com |
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