Vacon NX - Common Pre-Charging Circuit

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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