Vacon NX User Manual

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

Vacon NX Specifications

General

Product Type	AC Drive
Control Method	Scalar Control
Enclosure	IP00, IP21
Communication	Ethernet
Safety	STO (Safe Torque Off)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Ambient Temperature Range	-10°C to +50°C (with derating above +40°C)
Cooling Method	Air-cooled, Liquid-cooled