Atlas Copco GA 11+ Instruction Book page 72

Transportation brackets
Before starting the compressor for the first time, check that all red-colored transportation
brackets/bolts have been removed. They can be under the drivetrain, separation vessel and the
compressor of the integrated dryer (optional).
Electrical connections
• The supply voltage on the compressor terminals must not deviate more than 10% of the
nominal voltage. It is highly recommended to keep the voltage drop over the supply cable at
nominal current below 5% of the nominal voltage.
• Power supply cable must be sized and installed by a qualified electrician. Cable sizing
examples according to IEC and UL can be found in the Technical Data section of the Atlas
Copco Instruction Book. If cables are grouped together with other power cables, it may be
necessary to use cables of a larger size than those calculated for the standard operating
conditions. Local regulations remain applicable if they are stricter than the values proposed.
• A main switch and fuses are not included in the compressor unit and should be foreseen
externally by a qualified electrician. For selecting the correct fuse type and size, refer to the
service diagram or the Technical Data section of the instruction book. Note that different
sizes exist for compressors with or without integrated dryer.
• Always double-check the fuse size versus the calculated cable size. If required, reduce fuse
size or enlarge cable size.
• 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 well sealing cable gland when
connecting the supply cable to the compressor.
• For VSD compressors, fast reacting fuses should be installed as mentioned in the instruction
book. The use of circuit breakers is not allowed.
• Electric screw connections need to be checked and torqued before initial start-up. Torque
values can be found on the service diagram.
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Instruction book
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