56 vacon
cabling and connections
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
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 IO boards
User Manual.
6.2.1
Control voltage (+24V/EXT +24V)
It is possible to use the drive with an external power source with these properties: +24 VDC ±10%,
minimum 1000 mA. You can use it to externally power-up the control board, and the basic and
expander boards.
Connect the external power source to one of the 2 bidirectional terminals (#6 or #12), see Figure 48.
With this voltage, the control unit stays on and you can set the parameters. The measurements of
the main circuit (for example, the DC link voltage, and the unit temperature) are not available when
the drive is not connected to mains.
NOTE! If you supply the AC drive with external 24 V DC power, you must use a diode in terminal #6
(or #12) to prevent the current to flow in opposite direction. Put a 1 A fuse in 24 V DC line for each AC
drive. The maximum current consumption of each drive is 1 A from the external power supply.
A
B
C
D
E