NORD Drivesystems BU0700 - Manual (Page 17)

2 Assembly and installation
BU 0700 GB-1411 Subject to technical alterations 17
2.10 Electrical connections
2.10.1 Line and motor connections
WARNING
THESE DEVICES MUST BE EARTHED.
Safe operation of the devices presupposes that qualified personnel mount and operate it in compliance with
the instructions provided in these operating instructions.
In particular, the general and regional mounting and safety regulations for work on high voltage systems
(e.g. VDE) must be complied with as must the regulations concerning professional use of tools and the use
of personal protection equipment.
Dangerous voltages can be present at the line input and the motor connection terminals even when the
inverter is switched off. Always use insulated screwdrivers on these terminal fields.
Ensure that the input voltage source is not live before setting up or changing connections to the unit.
Make sure that the inverter and motor have the correct supply voltage set.
Note: If synchronising devices are connected or several motors are switched in parallel, the frequency inverter must be
operated with linear voltage/frequency characteristic curves, P211 = 0 and P212 = 0.
The line, motor, brake resistor and control connections are located on the base of the device. To gain access to the terminals,
the device covers (cover and grid) must be removed. The connection terminals are now accessible from the front. All covers
must be put back in place before switching on the supply voltage!
In general, the line, motor and brake resistor cables are connected first as their terminals are located on the bottom circuit
board. The cable inlet is a slit opening on the base of the device.
Note: when using specific wiring sleeves, the maximum connection cross-section can be reduced.
Pay attention to the following:
1. Ensure that the voltage source provides the correct voltage and is suitable for the current required (see Chapter 7
Technical data). Ensure that suitable circuit breakers with the nominal current range are inserted between the voltage
source and the inverter.
2. Connect the line voltage directly to the line terminals L
1
- L
2
- L
3
and the earth (PE).
3. A four-core cable must be used to connect the motor. The cable must be connected to the motor terminals U - V - W and
the PE.
4. If shielded cables are used, then the cable shield can also be applied to as much surface as possible on the shield support
angle.
Note: The use of shielded cables is essential in order to maintain the specified radio interference suppression level. (See
also Chapter 8.4 EMC limit value classes)
Steuerklemmenleiste
Netz- Motor- Widerstand- Anschluß