Atlas Copco GA160

2920 1251 02
3
Instruction book
1 LEADING PARTICULARS
1.1 General description
GA90 up to GA315 and GA90 W up to GA315 W are single-
stage, oil-injected screw compressors, driven by an electric
motor and enclosed in a sound-insulated bodywork.
GA90 up to GA315 are air-cooled, abbreviated as "GA". GA90
W up to GA315 W are water-cooled, abbreviated as "GA W".
The compressors are available for a maximum working pressure
of:
- 7.5, 10 or 13 bar(e) for 50 Hz versions
- 107, 132, 157 or 200 psig for 60 Hz versions
GA and GA W include mainly:
- Air filter(s)
- One or two compressor elements 1)
- One or two unloaders 1)
- Air receiver/oil separator
- Air cooler
- Oil cooler(s)
- Drive motor
- Drive coupling
- Gear casing
- Elektronikon
®
control system
- Safety valves
Energy recovery
The compressors can easily be provided with the Atlas Copco
energy recovery systems to recover the major part of the
compression heat in the form of hot water.
Heavy-duty filters
A heavy-duty filter kit is available as option allowing the
compressor to operate in heavily contaminated surroundings.
Oil/water separation
Atlas Copco has oil/water separators (type OSM), especially
designed for GA/GA W compressors, to separate oil from
condensate to meet the requirements of the local environmental
codes.
1.2 Elektronikon
®
control system
1.2.1 Elektronikon regulator
1.2.1.1 Automatic control of compressor operation
The regulator maintains the net pressure between programmable
limits by automatically loading and unloading the compressor.
A number of programmable settings, e.g. the unloading and
loading pressures, the minimum stop time and the maximum
number of motor starts are taken into account.
The regulator stops the compressor whenever possible to reduce
the power consumption and restarts it automatically when the
net pressure decreases. In case the expected unloading period
is too short, the compressor is kept running to prevent too-
short standstill periods.
Warning
A number of time-based automatic start/stop commands may
be programmed. 2) Take into account that a start command
will be executed (if programmed and activated), even after
manually stopping the compressor.
1.2.1.2 Protecting the compressor
Shut-down
If the temperature at the outlet of the compressor elements
exceeds the programmed shut-down level, the compressor will
be stopped. This will be indicated on display (4-Fig. 3a) and
general alarm LED (3) will blink. The compressor will also be
stopped in case of overload of the drive motor and on GA also
in case of fan motor overload.
Remedy the trouble and reset the message on the display before
restarting. See "User manual for Elektronikon
®
regulator",
section "Submenu STATUS DATA".
Shut-down warning
Before the shut-down level for the compressor element outlet
temperature is reached, a message will appear on display (4-
Fig. 3a) and general alarm LED (3) will light up, to warn the
operator that the shut-down warning level is exceeded. The
shut-down warning level is a programmable setting below the
shut-down level.
The message disappears as soon as the cause of the trouble is
remedied.
1.2.1.3 Monitoring components subject to service
The regulator continuously monitors the oil, oil filters, oil
separator, drive motor grease and air filters. Each input is
compared to programmed maximum time intervals or pressure
drops. If these limits are exceeded, a message will appear on
display (4-Fig. 3a) to warn the operator to replace the indicated
component, to change the oil or to grease the motor as the case
may be.
1) GA/GA W 90 up to -160 are equipped with one compressor
element and unloader, all other types have two compressor
elements and unloaders.
2) This funcion is called the Timer function. See "User manual for
Elektronikon regulator", section "Submenu TIMERS".