Vacon NX - Page 209

Brake chopper unit (NXB) vacon • 207
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
12
Heavy duty braking: 3 s 100%, followed by 7 s decreasing to zero
Light duty braking: 5 s 100%
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
NXB 0460_6 BRR0416 / 2.5 2710 7046 8.7/0.4/9.1 Ch62
NXB 0502_6 BRR0416 / 1.7 3986 10362 9.8/0.5/10.3 Ch62
*. c = power loss into coolant; a = power loss into air; T = total power loss; power losses of input chokes not
included.
All power losses obtained using max. supply voltage and switching frequency of 3.6 kHz and Closed-
Loop control mode. All power losses are worst case losses.
Table 101. VACON
®
standard brake resistors and NXB energy, mains voltage 640–1100 Vdc
Mains voltage 640-1100 VDC