NOTICE
If the AC drive is supplies 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 24: Parallel Connection of 24 V Inputs with Many AC Drives
NOTICE
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 terminals.
Table 10: 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)
Control Unit
Operating Guide | VACON® NX Inverters FI4-FI8
AQ299433367205en-000101 / DPD00908
60 | Danfoss A/S © 2019.07
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