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
Summary of Contents for NX
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