Brake chopper unit (NXB) vacon • 205
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
12
12.5.2 VACON
®
NXB; DC voltage 640–1100 V
For dimensions of BCU units, see Table 10.
NOTE! The rated currents in given ambient (+50 °C) and coolant (+30°) temperatures are achieved
only when the switching frequency is equal to or less than the factory default.
NOTE! Braking power: P
brake
= 2*U
brake
2
/ R
resistor
when 2 resistors are used
NOTE! Max input DC current: I
in_max
= P
brake_max
/ U
brake
Table 99. Power ratings of VACON
®
NXB, supply voltage 640–1100 Vdc
Braking voltage 640-1100 VDC ***)
NXB type
Loadability Braking capacity
Chassis
BCU rated
cont.
braking
current, I
br
[A]
Rated min
resistance
at 1100
VDC
[Ω]
Rated min
resist-
ance at
840 VDC
[Ω]
Rated
max input
current
[Adc]
Rated cont.
braking
power
2*R at
1100 VDC
[kW]
*
*. 1100 VDC equals U
brake
at 690 VAC
Rated cont.
braking
power
2*R at
840 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 CH61
NXB_0208 6 2*208 5.3 4.0 416 456 346 CH61
NXB_0261 6 2*261 4.2 3.2 522 572 435 CH61
NXB_0325 6 2*325 3.4 2.6 650 713 542 CH62
NXB_0385 6 2*385 2.9 2.2 770 845 643 CH62
NXB_0416 6 2*416 2.6 2.0 832 913 693 CH62
NXB_0460 6 2*460 2.4 1.8 920 1010 767 CH62
NXB_0502 6 2*502 2.2 1.7 1004 1100 838 CH62