Vacon NX User Manual

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

Vacon NX Specifications

General

Product Type	AC Drive
Control Method	Scalar Control
Enclosure	IP00, IP21
Communication	Ethernet
Safety	STO (Safe Torque Off)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Ambient Temperature Range	-10°C to +50°C (with derating above +40°C)
Cooling Method	Air-cooled, Liquid-cooled