NFO
Drives
AB
2021
201013
‐
2
Operating
and
Installation
Manual
13
4.2 Power terminal connection
4.2.1 Connectors
and
cables
The power terminals are of type “Push-Lock” with a cross section of 0.2 – 6mm
2
(AWG 24 – AWG 10). Use cable
type(-s) with operating temperature rating of at least 70
C. The cable insulation shall be stripped 12 mm before
pushed into the connector, and then the lever shall be closed.
It is important that the lever is pushed to its fully closed position, as shown below:
Fig.7. The connection lever of the power terminals
4.2.2 Power terminal use
Terminal Function
Description
L1
L2
Mains supply
Mains supply 380–480V 3~
L3
PE
Protective earth
Power supply protective earth
connector
B
Brake resistor
Connection for external brake resistor (between B and +)
-
-
Internal DC link voltage negative and positive terminals.
+
+
Positive terminal also used for external brake resistor (option)
PE
Protective earth
Motor protective earth connector
U
Motor phase connectors - To be connected to the
V
Motor outputs
correct poles of the motor. Incorrect connection can
W
cause erratic/unwanted behaviour of the motor.
Table 4. Use of power terminals
When installing two or more inverters together, with one or more of their motors running regeneratively, the
inverters DC link terminals (+ and -) can be connected to each other (thus supplying energy to each other).
Note! As there are component tolerances in the inverters, the link voltage may vary slightly between units, so an
equalising resistor and ultra-fast fuse must be fitted to each line.
Contact NFO Drives AB for correct dimensioning.
3006469-2022-04
