20 • vacon
MOUNTING
Tel. +358 (0)201 2121 • Fax +358 (0)201 212 205
5
1
1
1
3
3
3
2
2
2
Terminal numbers
5.4
AC choke connections
The AC input choke carries out several functions in the Vacon NX frequency converter. The input
choke is needed as an essential component for motor control, to protect the input and DC-link com-
ponents against abrupt changes of current and voltage as well as to function as a protection against
harmonics.
The frequency converter is equipped with one or more input AC chokes. The chokes have two induc-
tance 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.
!
WARNING
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)
2
500Vac/50Hz
(500V unit)
3
525Vac/50Hz
(690V unit)
3
575-690Vac/50-60Hz
(690V unit)
3
Figure 5-5. Input chokes
Figure 5-6. Input chokes tapping in FR13/14 units
Move the bridge plate to change
tapping
