Reference Designation
(1) Customer’s installation
(2) Option
(3) All voltages (50 and 60 Hz)
(4) GA 75-90 200-230 V (except GA75 230 V): 6 fuses
(5) All other versions: 3 fuses
Instructions
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 Electrical cable size.
4. If terminals 1, 3 and 5 of motor contactors K21 and K23 are not bridged, connect power supply cables to
terminals 1, 3 and 5 of contactor K21 and to terminals 1, 3 and 5 of contactor K23.
If terminals 1, 3 and 5 of motor contactors K21 and K23 are bridged, connect power supply cables to
terminals L1, L2 and L3 of terminal strip 1X0.
The power cables must be connected stress-free to the terminals to avoid mechanical forces to the
terminals. For this reason, the use of flexible cables is strongly advised.
Also see section Electrical cable size
5. Connect earth conductor bolt (PE).
Compressor status indication
On compressors equipped with an Elektronikon® controller, the 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.
On compressors equipped with an Elektronikon® Graphic controller, the controller is provided with potential
free auxiliary NO contacts (NO = normally open) (K05, K07 and K08) for remote indication of:
• Manual load/unload or automatic operation (K07)
• Warning condition (K08)
• Shut-down condition (K05)
Example: K05 is a NO (NO = normally open) contact. It 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.
Stop the compressor and switch off the voltage before connecting external equipment. Consult Atlas Copco.
Compressor control mode
On compressors equipped with an Elektronikon® controller, consult section Selection between local, remote
and LAN control if it is desired to switch to another control mode.
On compressors equipped with an Elektronikon® graphic controller, see section Control mode selection.
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.
Instruction book
2920 7109 60 153
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