Ctl NX2700 Manual de usuario descargar pdf (Pagina 25)

24 • vacon MOUNTING

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1 1 1

3 3 3

2 2 2

Terminal numbers

5.4 AC choke connections

Note: The NXC regenerative low-harmonic drive incorporates an LCL filter instead of AC chokes and

this instruction can be ignored.

The AC input choke carries out several functions in the Vacon NX 6- and 12-pulse frequency

converter. The input choke is needed as an essential component for motor control, to protect the

input and DC-link components against abrupt changes of current and voltage as well as to function

as a protection against harmonics.

The NXC 6- and 12-pulse frequency converter is equipped with one or more input AC chokes. The

chokes have two inductance levels to optimise the functionality at different supply voltages. In the

installation phase, the wiring of the chokes should be checked and changed if needed (not for FR9).

The input is always connected to terminal #1 (see picture below) and should not be changed. The

output of the choke should be connected to terminal #2 or #3 (see picture below) according to the

table below. The terminals are marked with inductance values and applicable voltage.

In units FR10 to FR12, the connection is changed by moving the cable to the appropriate terminals.

In FR13/14, the bridges of the busbar connection should be moved according to the settings shown in the

table.

In units with two or more parallel chokes (some FR11 as well as all FR12 and

FR13) all chokes have to be wired in the same way. If chokes are wired

differently the converter may be damaged.

Supply voltage

Converter

connection

(terminals)

400

480Vac/50

60Hz

(500V unit)

500Vac/50Hz

(500V unit)

500Vac

/50Hz

(690V unit)

575

690Vac/50

60Hz

(690V unit)

Figure 5-5. Input chokes

Figure 5-6. Input chokes tapping in FR13/14 units

Move the bridge plate to change

tapping

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Ctl NX2700 Manual de usuario Pagina 25

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