52 • vacon
cabling and connections
Tel: +358-201-2121
•
Fax: +358-201-212 205
6
6.2
Control unit
The control unit of the inverter consists of the control board and option boards (see Figure 6-13 and
Figure 6-20) connected to the five slot connectors (A to E) on the control board. The control board is
connected to the power unit through a D connector (1).
Figure 6-13. control board
Figure 6-14. Basic and option board connections
on the control board
When the inverter is delivered from the factory, the control unit usually includes 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 of the two basic boards, the
descriptions. The I/O boards mounted at the factory are
indicated in the type code. For more information on the option boards, see Vacon NX option board
manual (ud741).
The control board can be powered externally (+24V) by connecting the external power source to
bidirectional terminal #6 (see Table 6-9). This voltage is sufficient for parameter setting and for
keeping the fieldbus active.
Note! If the +24V input of several inverters are connected in parallel, we recommend to use a diode
in terminal #6 to avoid the current to flow in opposite direction, which might damage the control
board.
+
-
#
6
#
7
+
-
#
6
#
7
+
-
#
6
#
7
+
-
#
6
#
7
n
k
6
_
1
7
External
+
2
4
V
Summary of Contents for NXI
Page 1: ...vacon nxi inverters fi9 fi14 user manual ...
Page 104: ......
