140 • vacon
BRAKE CHOPPER UNIT (NXB)
Tel. +358 (0)201 2121 • Fax +358 (0)201 212 205
9
10.5.2
Vacon NXB; DC voltage 640–1100V
Braking voltage 640-1100 Vdc
Loadability
Braking capacity
NXB type
BCU rated
cont. braking
current, I
br
[A]
Rated min
resistance
@1100VDC
[
Ω
]
Rated min
resistance
@840VDC
[
Ω
]
Rated max
input current
[Adc]
Rated cont.
braking power
2*R@ 1100VDC
[kW]
Rated cont.
braking power
2*R@ 840VDC
[kW]
Chassis
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
Table 10-3. Power ratings of Vacon NXB, supply voltage 640–1100Vdc
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