7 electrical connection of power unit – NORD Drivesystems BU0180 User Manual

Page 31

2 Assembly and installation

BU 0180 GB-0914

Pre-series version

L1 / L

L2 / N

L3 / -
PE

PE L3 L2 L1

PE U V W +B -B

Internal or

external braking

resistor

2.7 Electrical connection of power unit

All connection terminals are located in the connection
unit of the frequency inverter.

Separate terminal bars are provided for the power
connections and the control connections, as well as a
further terminal bar for the connection of the
thermistor.

The PE connections (device earth) are located on the
power connections for the motor and the mains, as
well as on the base in the cast housing.

Before and while the device is connected, the
following must be observed:

1. Ensure that the mains supply provides the correct

voltage and is suitable for the current required
(see Section 8 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 mains voltage directly to the

terminals L

-L

/N-L

und PE (according to the

device).

4. To connect the motor, three flexible wires U-V-W

should be used when mounting the motor.

5. For wall-mounting a 4-conductor shielded motor

cable (recommended) to the terminals U-V-W and
earth should be used. In this case the cable
shielding should be connected to a large area of
the metallic screw connector.

NOTE:

if certain wire end sleeves are used, the maximum cross-section which can be connected may
be reduced.

Screwdriver: Use a 5.5mm slot-head screwdriver to connect the power unit.

NOTE:

If synchronous machines or several motors are connected in parallel to a device, the fre-
quency inverter must be switched over to linear voltage/frequency characteristic curves, 
P211 = 0 and P212 = 0.

NOTE:

Only use copper cables with temperature class 80°C or equivalent for connection. Higher tem-
perature classes are permissible.

NOTE:

The use of shielded cables is essential in order to maintain the specified radio interference
suppression level. (See also Section 9.3.3 (EMC))

CAUTION:

This device produces high frequency interference, which may make additional suppression

measures necessary in domestic environments. (Details in Section 9.3 / 9.3.3 (EMC))

Control terminal bar

Mains/motor/resistance con-

nections