Vacon NX User Manual
Also see for NX: Installation manualUser manualQuick helpUser manualUser manual
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Contents
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11vacon • 188 Non-regenerative front endLocal contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/11.11 DC pre-charging circuitEach Non-regenerative Front End unit requires its own external pre-charging circuit. The purposeof the pre-charging unit is to charge the voltage in the intermediate circuit to a level sufficient forconnecting the Non-regenerative Front End unit to the mains. The charging time depends on thecapacitance of the intermediate circuit of the total common DC-bus system and the resistance ofthe charging resistors. The technical specifications of manufacturer's standard pre-chargingcircuits are shown in Table 81. The pre-charging circuits are suitable for 400-500 Vac and 525-690Vac.The pre-charging duration and DC voltage level are monitored by the NXP control. The DC voltagelevel must be over 40VDC after 1 second charging and final pre-charging voltage level must bereached within the maximum charging time. If these conditions are not reached, a charging fault isissued. The maximum charging time can be set by a parameter.The pre-charging components can be ordered separately. The pre-charging circuit includes thefollowing components: 2 pcs charging resistors, the contactor, the diode bridge and the snubbercapacitor, see Table 82. Each pre-charging circuit has maximum charging capacity, see Table 81. Ifthe capacitance of the intermediate circuit in the total system exceeds the values shown, contactyour nearest distributor.Table 81. Capacitance Min and Max value for Pre-charging circuitPre-charging circuit ratingsPre charging type Resistance CapacitanceMinCapacitanceMaxCHARGING-AFE-FFE-FI9 2 x 47 R 4950 μF 30000 μFCHARGING-AFE-FFE-FI10 2 x 20 R 9900 μF 70000 μFCHARGING-AFE-FFE-FI13 2 x 11 R 29700 μF 128000 μFTable 82. Type designation code for the pre-charging components configurationFI9 AFE / CHARGING-AFE-FFE-FI9Item Q‘ty Description Manufacturer Product Code1 1 Diode Bridge Semikron SKD 822 2 Charcing resistors Danotherm CAV150C47R3 1 Snubber capacitor Rifa PHE4484 1 Contactor Telemecanique LC1D32P7FI10 AFE / CHARGING-AFE-FFE-FI10Item Q‘ty Description Manufacturer Product Code1 1 Diode Bridge Semikron SKD 822 2 Charcing resistors Danotherm CBV335C20R3 1 Snubber capacitor Rifa PHE4484 1 Contactor Telemecanique LC1D32P7 |
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