Connect the external power source to one of the 2 bidirectional terminals (#6 or #12), see the option board manual or VACON
®
NX
I/O Boards User Manual. With this voltage, the control unit stays on and parameters can be set. 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.
N O T I C E
If the AC drive is supplied with external 24 V DC power, 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 supply.
e
3
0
b
g
0
1
2
.1
0
PE/GND
-G1
Ext +24VDC
Power Supply
-F1
#6 #7
#6 #7
#6 #7
#6 #7
#6 #7
#6 #7
-F2
1A
gG/
Class CC
-Q1
3A
-Q2
3A
-Q3
3A
-Q4
3A
-Q5
3A
-Q6
3A
-F3
1A
gG/
Class CC
-F4
1A
gG/
Class CC
-F5
1A
gG/
Class CC
-F6
1A
gG/
Class CC
-F7
1A
gG/
Class CC
Illustration 39: Parallel Connection of 24 V Inputs with Many AC Drives
N O T I C E
The control unit I/O ground is not isolated from the chassis ground/protective earth. In the installation, consider the potential
differences between the grounding points. We recommend using galvanic isolation in the I/O and 24 V circuitry.
7.3 Control Unit Cabling
7.3.1 Selection of the Control Cables
The control cables must be a minimum of 0.5 mm
2
(20 AWG) shielded multicore cables. See more on the cable types in
terminal wires must be a maximum of 2.5 mm
2
(14 AWG) for the terminals of the relay board and 1.5 mm
2
(16 AWG) for other termi-
nals.
Table 12: Tightening Torques of the Control Cables
The terminal
The terminal screw
The tightening torque in Nm (lb-in.)
Relay and thermistor terminals
M3
0.5
(4.5)
Other terminals
M2.6
0.2
(1.8)
7.3.2 Control Terminals on OPTA1
The figure shows the basic description of the terminals of the I/O board. For more information, see
7.3.2.2 Jumper Selections on the
. For more information on control terminals, see VACON
®
All in One Application manual.
AQ275638903263en-000601 / DPD00910
88 | Danfoss A/S © 2022.12
Control Unit
VACON® NXS/NXP Air-cooled
Operating Guide
