
Technical data
vacon • 27
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
4
NOTE!
Braking power: P
brake
= U
brake
^2 / R
brake
NOTE!
Braking DC current: I
in_max
= P
brake_max
/ U
brake
1)
Only 6 pulse drives
The internal brake chopper can also be used in motor application where 2…4 x Ch7x drives are used for a
single motor, but in this case the DC connections of the power modules must be connected together. The
break choppers are working independently of each other and because of this the DC connections must be
connected together otherwise there can be unbalance between the power modules.
NX_460 6
1)
2.8
252
300
432
392
Ch72
NX_502 6
1)
2.8
252
300
432
392
Ch72
NX_820 6
2.8
252
300
432
392
Ch74
NX_920 6
2.8
252
300
432
392
Ch74
NX_1030 6
2.8
252
300
432
392
Ch74
NX_1180 6
2.8
252
300
432
392
Ch74
NX_1300 6
2.8
252
300
432
392
Ch74
NX_1500 6
2.8
252
300
432
392
Ch74
NX_1700 6
2.8
252
300
432
392
Ch74
Table 10. Internal brake chopper unit (BCU) ratings, braking voltage 840—1100 VDC
Internal brake chopper ratings, braking voltage 840-1100 Vdc
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