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Operating Guide | VACON® NXS/NXP Air-cooled
For instructions on how to install the control unit that is not attached to the power unit, see VACON
Manual.
7.2 Control Voltage (+24 V/EXT +24 V)
It is possible to use the drive with an external power source with these properties: +24 V DC ±10%, minimum 1000 mA. Use it to
externally power up the control board, and the basic and option boards. The analog outputs and inputs at OPTA1 do not work with
only +24 V supplied to the control unit.
Connect the external power source to one of the 2 bidirectional terminals (#6 or #12), see the option board manual or VACON
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.
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.
-G1
Ext +24VDC
Power Supply
-F1
Class CC
Illustration 45:
Parallel Connection of 24 V Inputs with Many AC Drives
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.
102 | Danfoss A/S © 2020.02
PE/GND
-F2
-F3
1A
1A
gG/
gG/
Class CC
Class CC
-Q1
-Q2
3A
3A
#6 #7
#6 #7
N O T I C E
-F4
-F5
1A
1A
gG/
gG/
gG/
Class CC
Class CC
-Q3
-Q4
3A
3A
#6 #7
#6 #7
N O T I C E
®
NXP IP00 Drives Installation
-F6
-F7
1A
1A
gG/
Class CC
-Q5
-Q6
3A
3A
#6 #7
#6 #7
AQ275638903263en-000301 / DPD00910
Control Unit
®
NX I/O
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