BRAKE CHOPPER UNIT (NXB)
vacon • 139
24-hour s358 (0)40 837 1150 • Email: [email protected]
10
10.5
BCU power ratings
10.5.1
Vacon NXB; DC voltage 460–800V
Braking voltage 460-800 Vdc
Loadability
Braking capacity
NXB type
BCU rated
cont. braking
current, I
br
[A]
Rated min
resistance
@800VDC
[
Ω
]
Rated min
resistance
@600VDC
[
Ω
]
Rated max
input current
[Adc]
Rated cont.
braking power
2*R@ 800VDC
[kW]
Rated cont.
braking power
2*R@ 600VDC
[kW]
Chassis
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_0208 5
2*208
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
883
CH62
Table 10-2. Power ratings of Vacon NXB, supply voltage 460–800Vdc
For dimensions of BCU units, see Table 5-1.
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