
12
vacon • 204
Brake chopper unit (NXB)
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
12.5
BCU power ratings
12.5.1
VACON
®
NXB; DC voltage 460–800 V
For dimensions of BCU units, see Table 14.
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
brake
NOTE!
Max input DC current: I
in_max
= P
brake_max
/ U
brake
Table 98. Power ratings of VACON
®
NXB, supply voltage 460–800 Vdc
Braking voltage 460-800 VDC
NXB type
Loadability
Braking capacity
Chassis
BCU rated
cont. braking
current, I
br
[A]
Rated min
resistance
at 800 VDC
[
Ω
]
Rated min
resistance
at 600 VDC
[
Ω
]
Rated
max input
current
[Adc]
Rated cont.
braking
power
2*R at
800 VDC
[kW]
*
*. 800 VDC equals U
brake
at 500 VAC
Rated cont.
braking
power
2*R at
600 VDC
[kW]
**
**. 600 VDC equals U
brake
at 380 VAC
NXB_0031 5
2*31
25.7
19.5
62
49
37
CH3
NXB_0061 5
2*61
13.1
9.9
122
97
73
CH3
NXB_0087 5
2*87
9.2
7.0
174
138
105
CH4
NXB_0105 5
2*105
7.6
5.8
210
167
127
CH4
NXB_0140 5
2*140
5.7
4.3
280
223
169
CH4
NXB_0168 5
2*168
4.7
3.6
336
267
203
CH5
NXB_0205 5
2*205
3.9
3.0
410
326
248
CH5
NXB_0261 5
2*261
3.1
2.3
522
415
316
CH5
NXB_0300 5
2*300
2.7
2.0
600
477
363
CH61
NXB_0385 5
2*385
2.1
1.6
770
613
466
CH61
NXB_0460 5
2*460
1.7
1.3
920
732
556
CH62
NXB_0520 5
2*520
1.5
1.2
1040
828
629
CH62
NXB_0590 5
2*590
1.4
1.1
1180
939
714
CH62
NXB_0650 5
2*650
1.2
1.0
1300
1035
786
CH62
NXB_0730 5
2*730
1.1
0.9
1460
1162
833
CH62
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