Atlas Copco GA11 – 30
Atlas Copco’s GA compressors deliver outstanding performance, flexible operation and the highest productivity, while minimising the total cost of ownership.
The GA11+ – 30 Workplace, full feature, air cooled, silenced, rotary screw compressors are complete compressor packages that include the following equipment:
- Rotary screw compression element
- IP55 drive motor
- High efficiency gearbox
- Elektronikon MkV Graphic controller (option for GA30)
- Regulation system
- Star delta starter
- Lubrication system
- Aftercooler with integrated moisture separator and zero loss electronic condensate drain
- Integrated refrigerant dryer with zero loss electronic condensate drain
- Radial cooling fan
- First fill of lubricant
- Steel base and acoustic enclosure
Features and Benefits
Compression & Drive
At the heart of the compressor is an Atlas Copco designed and manufactured compression element featuring asymmetric profile male and female rotors driven via a compact gearbox and Siemens, IP55, EFF1, totally enclosed fan-cooled drive motor.
The innovative high efficiency, maintenance free gearbox provides transmission efficiency equal to direct drive. An oversized motor drive end bearing integrated into the gearbox benefits from superior lubrication whilst the non drive end bearing is a greased sealed type. Motor bearing regreasing maintenance is therefore eliminated and bearing life is extended.
The combination of the high output compression element and high efficiency gearbox coupled with the EFF1 high efficiency motor provides unrivalled compression and hence energy efficiency.
Ambient air filtered by a 3 micron intake filter(1), passes to the intake valve(2) and into the compression element(3). Lubricant is injected into the air and the air is compressed by the interaction of the male and female rotors. The air / oil mixture passes through a non return valve(4) to the oil reservoir(5) and oil separator element which remove the majority of the oil, providing compressed air with an oil content of less than 2 ppm. The air then passes through a minimum pressure valve(6) and is cooled by an air cooled aftercooler(7). The condensed moisture is removed by an low pressure drop integrated moisture separator and zero loss electronic condensate drain(9). The air then enters the refrigerant dryer(10) and condensed moisture is removed by a moisture separator and automatic condensate drain(11).
Lubricant contained in the oil reservoir(5) flows under differential pressure to a thermostatic bypass valve(13), air cooled oil cooler(12), high efficiency oil filter(14) and oil stop valve(15) before being injected into the compression element(3) where it cools, seals and lubricates the compression process. The high efficiency oil filter provides superior filtration to conventional spin on filters resulting in cleaner lubricant. The thermostatic bypass valve(13) ensures that the compressor quickly reaches optimum operating temperature on start up and maintains temperature during periods of low load by allowing cold lubricant to bypass the oil cooler.
A low noise radial cooling fan provides air cooling to the oil cooler(7) and aftercooler(12), ensuring satisfactory running temperatures as well as ventilating the compressor enclosure and electrical cubicle.
Monitoring and Control
The compressor is fitted with the advanced Elektronikon MkV Graphic controller which monitors, controls and ensures safe operation of the unit. The controller incorporates a 3.5” colour display and provides advanced monitoring and control possibilities.
An icon based menu navigation system simplifies set-up and operator interface.
The controller incorporates a web-server that provides remote, internet browser based, compressor status visualisation simply by connecting the controller to a local area network via the provided Ethernet port.
The controller also incorporates the following features:
- Remote start / stop input
- Remote load / unload input
- General warning and shutdown outputs
- Automatic restart after voltage failure
- Timed starting and stopping
- Dual pressure bands
- Timed switching of pressure bands
- Password protection of settings
- Safety and Protection
The control system will shutdown the compressor in the event of high temperatures and pressures and protects the unit from out of range operation. A safety valve fitted in the oil reservoir(4) protects the unit against over-pressurisation.
The main drive and fan motors are protected against overload.
A phase sequence relay, fitted as standard, protects the compressor from incorrect connection of the electrical supply.
The Elektronikon MkV Graphic controller accurately monitors pressure via a pressure transducer mounted at the compressor discharge and opens and closes the intake valve(2) at the programmed pressure settings to automatically load and unload the compressor.
A delayed second stop feature (DSS) stops the compressor immediately after unloading and minimizes power consumption by safely keeping unloaded running time to a minimum.
The compressor is mounted on a free standing base with fork lift openings for easy handling and is enclosed in an acoustically lined polyester coated steel enclosure that reduces noise levels.
The enclosure features removable doors for easy access and a hinged door on the electrical cubicle.