ELECTRICAL CABLING AND CONNECTIONS
vacon • 77
24-hour s358 (0)40 837 1150 • Email: [email protected]
6
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#6
#7
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#6
#7
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#6
#7
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#6
#7
nk6_17
External
+24V
6.2
Control unit
The control unit of Vacon NX Liquid-Cooled frequency converter/inverter is installed into a mounting box. It
contains the control board and additional boards (see Figure 6-6 and Figure 6-7) connected to the five
slot
connectors
(A to E) of the control board. The control unit and the ASIC of the power unit are connected
through cables (and an adapter board). For more information, see page 88.
The mounting box with the control unit is mounted inside an enclosure. See the mounting instructions on
page 84.
Figure 6-6. NX control board
Figure 6-7. Basic and option board connections
on the control board
Usually, when the frequency converter is delivered from the factory, the control unit includes at least the
standard compilation of two basic boards (I/O board and relay board) which are normally installed in slots
A and B. On the next pages you will find the arrangement of the
control I/O and the relay terminals
two basic boards, the
and the
. The I/O boards mounted
at the factory are indicated in the type code.
The control board can be powered externally (+24V, ±10%) by connecting the external power source to ei-
ther of the bidirectional terminal #6 or #12, see page 81. This voltage is sufficient for parameter setting
and for keeping the fieldbus active.
Note! If the 24V inputs of several frequency converters are parallelly connected we recommend to use a
diode in terminal #6 (or #12) in order to avoid the current to flow in opposite direction. This might damage
the control board. See picture below.
A
B
C
D
E