Electrical cabling and connections vacon • 95
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
6
Usually, when the AC drive 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.
The control board can be powered externally (+24 VDC, ±10%) by connecting the external power
source to the control unit. This voltage is sufficient for parameter setting and for keeping the
fieldbus active.
NOTE! The control board of NX_8 (voltage class 8) AFE, INU or BCU units must always be powered
externally with a +24 VDC ±10% power source.
The preferred solution is to connect the external +24 VDC power supply to the fiber adapter board
terminals X3:1 (24 VDC) & X3:2 (GND) or star coupler board terminals X4:25 (24VDC)& X4:26 (GND),
see pictures below.
The control board can also be powered externally (+24 V, ±10%) by connecting the external power
source to either of the bidirectional terminal #6 or #12, see page 98.
NOTE! If the 24 V inputs of several AC drives 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.
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