Vacon NX User Manual

Active front end (NXA) vacon • 173
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
10
10.10 Common pre-charging circuit
In case of paralleled Active Front End units, one common pre-charging circuit can be used, see
Figure 96. Standard pre-charging circuits can be used if the capacitance of the intermediate circuit
not exceeds maximum value. If all paralleled Active Front End units have a common circuit breaker,
the breaker can be controlled by one of the Active Front End units. If each paralleled Active Front
End unit has its own circuit breaker, each Active Front End controls it’s own circuit breaker. The
circuit diagram for control, see Figure 94 and Figure 95.
Figure 96. Active Front End units parallel connection with one common pre-charging circuit
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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