(7) All other voltages
Connection
1. Install 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. See section Settings of fuses.
4. Connect the power supply cables to terminals (2, 4 and 6) on contactor (K21).
5. Connect the earth conductor to the earth bolt (PE).
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.
Compressor control modes
Consult section Programming compressor control modes if it is desired to switch to another
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.
For remote starting and stopping:
Connect a start/programmed stop button (S1') between terminals 1 and 2 (wires 30 and 33)
of connector (X108). See section Electrical system to locate the terminal strip.
• LAN control: The compressor is controlled via a local network. Consult Atlas Copco.
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.
Compressor status indication
The Elektronikon II regulator is provided with potential-free auxiliary contacts (K07, K08 and K09)
for remote indication of:
• Manual or automatic operation (K07)
• Warning condition (K08)
• Shut-down condition (K09)
Maximum contact load: 10 A / 250 V AC.
Stop the compressor and switch off the voltage before connecting external equipment. Consult
Atlas Copco.
Instruction book
50 API161475
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