Electrical Connections - Atlas Copco LF 2 Instruction Book

3.3

Electrical Connections

Warning
The electrical connection must be carried out by an electrician and corresponds to the local
codes. The indications on the motor data plate must correspond to the power supply voltage
and frequency. The installation must include an isolating switch in the power line near to the
unit and be protected against short-circuits by fuses for each phase refer section Overload
relays and fuses or Cable sizes.
The power supply and earthing lines must be of suitable size. refer section Overload relays
and fuses or Cable sizes.
For DOL starters, connect the power supply cables as shown in the electrical diagrams. For
Y/D starters, connect the power supply cables to terminal board (X1) as shown in the picture.
Check the setting of the overload relay. refer section Overload relays and fuses or Cable
sizes.
Electric Cabinet
Reference Description
F1 Fuse
F4 Overload relay
K1 Line contactor with integrated Y-D timer
K2 Star contactor
K3 Delta contactor
40
Example of an electrical cubicle
Instruction book
2920 7090 00