Electrical Connection Of Power Unit - nord NORDAC SK 5xxE Series Manual

2.8 Electrical connection of power unit

The terminals of the mains connection and the multi-function relay (X3)
are located on the top of the frequency inverter.
The motor and brake resistor connections are located on the base of
the unit.
The control terminals can be accessed from the front of the frequency
inverter. For this the terminal cover (below the TU insert) must be
pushed downwards, and can then be removed. The connecting
terminals are then easily accessible.
Before connecting the device,
the following must be observed:
1. Ensure that the voltage source provides the correct voltage and is
suitable for the current required (see Section. 7 Technical data).
2. Ensure that suitable circuit breakers with the specified nominal
current range are installed between the voltage source and the
inverter.
3. Connect the line voltage directly to the line terminals L
the earth (according to the device).
4. A four-core cable must be used to connect the motor. The cable is
connected to the motor terminals U - V - W and the earth.
5. If screened motor cables (recommended) are used, the cable
screening must also be connected to a large area of the metallic
screening angle of the EMC Kit (Section 2.4), however, at least to
the electrically conducting mounting surface of the control cabinet.
Note: when using specific wiring sleeves, the maximum
NOTE:
connection cross-section can be reduced.
Screwdriver: A cross-head screwdriver (Pozidrive/Supadrive size 1) is used for connecting the
power unit
If synchronising devices or several motors are connected in parallel, the frequency inverter must
NOTE:
be switched over to linear voltage/frequency characteristic curves,
he use of shielded cables is essential in order to maintain the specified radio interference
NOTE:
suppression level. (See also Chapter 8.4 EMC limit value classes)
This device produces high frequency interference, which may make additional suppression
ATTENTION:
measures necessary in domestic environments. (Details in Section 8.3/8.4)
BU 0500 GB
-L
1 2
Subject to technical alterations
2 Assembly and installation
X1 - PE L3 L2 L1
/N-L and
3
X2 - PE U V W +B -B -DC
P211 = 0 and P212 = 0.
L1 / L
L2 / N
L3 / -
PE
X3 - 4 3 2 1
External
Braking
resistor
M
3~
25