11vacon • 174 BRAKE CHOPPER UNIT (NXB)11.5.2 Vacon NXB; DC voltage 640–1100 VFor dimensions of BCU units, see Table 10.NOTE! The rated currents in given ambient (+50 °C) and coolant (+30°) temperatures are achievedonly when the switching frequency is equal to or less than the factory default.NOTE! Braking power: P brake = 2*U brake2 / R resistor when 2 resistors are usedNOTE! Max input DC current: I in_max = Pbrake_max / U brakeTable 67. Power ratings of Vacon NXB, supply voltage 640–1100 VdcBraking voltage 640-1100 VDC ***)NXB typeLoadability Braking capacityChassisBCU ratedcont.brakingcurrent, I br[A]Rated minresistanceat 1100VDC[Ω]Rated minresis-tance at840 VDC[Ω]Ratedmax inputcurrent[Adc]Rated cont.brakingpower2*R at1100 VDC[kW] **. 1100 VDC equals U brake at 690 VACRated cont.brakingpower2*R at840 VDC[kW]****. 840 VDC equals U brake at 525 VAC***) Mains voltage 640-1136 VDC for NX_8 inverter units.NXB_0170 6 2*170 6,5 4,9 340 372 282 CH61NXB_0208 6 2*208 5,3 4,0 416 456 346 CH61NXB_0261 6 2*261 4,2 3,2 522 572 435 CH61NXB_0325 6 2*325 3,4 2,6 650 713 542 CH62NXB_0385 6 2*385 2,9 2,2 770 845 643 CH62NXB_0416 6 2*416 2,6 2,0 832 913 693 CH62NXB_0460 6 2*460 2,4 1,8 920 1010 767 CH62NXB_0502 6 2*502 2,2 1,7 1004 1100 838 CH62Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
