NORD Drivesystems BU0240 - Manual (Page 15)

2 Assembly and installation
BU 0240 GB 15
L1 / L
L2 / N
L3 / -
PE
PE L3 L2 L1
M
3~
PE U V W +B -B
Internal or
external braking
resistor
2.3 Electrical connection of power unit
All connection terminals are located in the connection
unit of the frequency inverter.
One terminal block is provided for the power
connections and one for the control connections.
The earthing connections (device earthing) are
located on the base in the cast housing of the
connection unit.
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.
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
1
-L
2
/N-L3 and the earth (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:
when using specific wiring sleeves, the maximum connection cross-section can 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
frequency inverter must be switched over to linear voltage/frequency characteristic curves,
Æ
P211 = 0 and P212 = 0.
NOTE:
Only use copper cables with min. 75°C or 75°C/80°C or equivalent for connection. Higher
temperature classes are permissible.
NOTE:
The use of shielded cables is essential in order to maintain the specified radio interference
suppression level.
ATTENTION:
This device produces high frequency interference, which may make additional suppression
measures necessary in domestic environments.