Vacon NX User Manual

10
vacon • 154 Active front end (NXA)
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
10. ACTIVE FRONT END (NXA)
10.1 Introduction
The VACON
®
NX Active Front End is used to transfer power between the AC input and intermediate
DC circuit. The VACON
®
NX Active Front End has a two-way function. This means that when power
is transferred from the AC input to the intermediate DC circuit, the VACON
®
NX Active Front End
rectifies the alternating current and voltage. When power is transferred from the intermediate DC
circuit to the AC input, the VACON
®
NX Active Front End inverts the direct current and voltage.
The Active Front End configurations consist of the unit itself, LCL filter, pre-charging circuit, control
unit, AC fuses, main contactor / circuit breaker and DC fuses which you need to take into account
when planning the switchgear configuration, see Figure 85.
10.2 Diagrams
10.2.1 Active Front End Unit block diagram
Figure 85. Active front end configuration
3073_uk

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