8
vacon • 60
INSTALLATION INSTRUCTIONS
Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 205
8.2
Control unit
The control unit of the frequency converter consists roughly of the control board and additional
boards (see Figure 31 and Figure 32) connected to the five
slot connectors
(A to E) of the control
board. The control board is connected to the power unit through a D-connector (1) or fibre optic
cables.
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 of the two basic boards, the general wiring diagram and the control signal
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 (+24 V, ±10%) by connecting the external power source
to either of the bidirectional terminala #6 or #12, see page 63. This voltage is sufficient for
parameter setting and for keeping the fieldbus active.
NOTE! Each AFE module of a NXC low-harmonic drive has its own control unit. The three basic
boards A1,A2 and B5 are included as standard. AFE control usually needs to be parameterized only
once during the commissioning of the drive.
NOTE!
If the 24 V 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.
Figure 31. NXP control board
Figure 32.
Basic and option board connections
on the control board
11512_00
A
B
C
D
E
11513_00
+
-
#6
#7
+
-
#6
#7
+
-
#6
#7
+
-
#6
#7
External
+24V
11514_uk
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