MOUNTING
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5
5.4
AC choke connections
NOTE!
The NXC 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.
Figure 6. Input chokes
Figure 7. Input chokes tapping in FR13/14 units
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 con-
verter may be damaged.
Supply voltage
Converter
connection
(terminals)
400-480 Vac/50-60 Hz
(500 V unit)
2
500 Vac/50 Hz
(500 V unit)
3
500 Vac/50 Hz
(690 V unit)
3
575-690 Vac/50-60 Hz
(690 V unit)
3
13006.emf
1
1
1
3
3
3
2
2
2
Terminal numbers
11487_uk
Move the bridge plate to change
tapping
11488 uk
Содержание nxp/c
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