Electrical Connections - Atlas Copco GA 15 Instruction Book

4.3

Electrical connections

Important remark
To preserve the protection degree of the electric cubicle and to protect its components from
dust from the environment, it is mandatory to use a proper cable gland when connecting the
supply cable to the compressor.
Instructions
Also see section
1. Provide an isolating switch.
2. Check that the motor cables and wires inside the electric cabinet are clamped tight to their terminals.
3. Check the fuses and the setting of the overload relay. See section
4. Connect the power supply cables to their terminals L1, L2, L3.
5. Connect neutral conductor to connector (N) if applicable.
6. Connect earth conductor bolt (PE).
On Full-Feature versions:
The supply voltage to the dryer must be 230 V single-phase. The voltage to the dryer is supplied over the
contacts of relay (K11), which close when the compressor is started. For compressor supply voltages
different from 3 x 400 V plus neutral and 3 x 230 V, the dryer is powered by a transformer.
Compressor control modes on compressors with Elektronikon® controller
Consult section
control mode.
The following control modes can be selected:
• Local control: The compressor will react to commands entered by means of the buttons on the
control panel. Compressor start/stop commands via Clock function are active, if programmed.
• Remote control: The compressor will react to commands from external switches. Emergency stop
remains active. Compressor start/stop commands via Clock function are still possible.
Options:
• Remote starting and stopping (switch S1')
• Remote loading/unloading (manual switch S4')
See section
• LAN control: The compressor is controlled via a local network. Consult Atlas Copco.
Compressor status indication on compressors equipped with an Elektronikon® controller
The Elektronikon controller is provided with an auxiliary relay (K05) for remote indication of a shutdown.
This NO contact (NO = normally open) will be closed if all conditions are normal and will open in case of
power failure or shutdown.
Maximum contact load: 10 A / 250 V AC.
70
Electrical diagrams.
Selection between local, remote and LAN control
Electrical system to locate the connectors.
Have the modifications checked by Atlas Copco.
Stop the compressor and switch off the voltage before connecting external equipment.
Only potential free contacts are allowed.
Settings of overload relay and
if it is desired to switch to another
Instruction book
fuses.
API459842