Atlas Copco GA 11+ Instruction Book page 73

Instruction book
Rotation check
At first startup, a rotation check must be done in order to check the phase direction of the
incoming power lines.
• Fixed speed compressors
• Switch on the voltage. Start the compressor and stop it immediately. Check the rotation
direction of the drive motor while the motor is coasting to a stop. The correct rotation
direction of the drive is indicated by an arrow shown on the motor fan cowl.
If the rotation direction of the drive motor is incorrect, open the isolating switch and
reverse two incoming main power lines.
• VSD compressors
• Aircooled versions: Check the rotation of the main fan. The cooling fan contactor
(mostly denoted as Q15 or K15, see service diagram) must be switched manually for a
short moment of time. Rotation arrows, visible through the grating in the roof, are
provided on the plate below the fan to indicate the correct rotation direction on the fan
motor. If the rotation direction of the fan motor is incorrect, open the isolating switch
and reverse two incoming main power lines.
• Water cooled versions: Check the rotation of the dryer (only needed for Full-Feature
versions, Pack versions will rotate correctly). The dryer contactor (mostly denoted as
K11, see service diagram) must be switched manually for a short moment of time.
Rotation arrows are provided to indicate the correct rotation direction of the dryer
condenser fan. If the rotation direction of the dryer condenser fan is incorrect, open the
isolating switch and reverse two incoming main power lines.
Condensate collection
The drain pipes to the drain collector may not dip into the water of the drain collector.
Atlas Copco has oil/water separators (type OSD or OSCi) to separate oil from the condensate to
ensure that the condensate meets the requirements of the environmental codes. Drain pipes of
2920 7118 31
Incorrect phase direction on the incoming power lines may cause irreversible damage to the
compressor element.
71