Atlas Copco GA5 – 11
Atlas Copco's oil-injected rotary screw compressors are leader in the market thanks to outstanding performance and flexible operation. This results in the highest productivity while minimising the total cost of ownership.
The GA5 – 11 Full Feature, Workplace, air cooled, silenced, rotary screw compressors are complete compressor packages that include the following equipment:
- Atlas Copco compression element
- IP55 EFF1 efficiency drive motor
- Elektronikon MkV Graphic controller
- Regulation system
- Star delta starter
- Lubrication system
- Aftercooler and moisture separator
- First fill of lubricant
- Integrated refrigerant dryer
- Steel base and acoustic enclosure
Variants and Options:
- Floor mounted
- 270 litre receiver mounted compressor
- 500 litre receiver mounted compressor
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, belt-driven from a high efficiency IP55 EFF1 totally enclosed fan-cooled drive motor.
The high output compression element driven by an EFF1 high efficiency motor provides unrivalled compression efficiency.
Ambient air, filtered by a 3 micron intake filter, passes through an intake valve and then into the compression element. Lubricant is injected into the air and the air is compressed by the interaction of the male and female rotors. The air / oil mixture enters the oil reservoir and spin-on 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 and is cooled by an air cooled aftercooler. The condensed moisture is removed by a moisture separator and automatic condensate drain. On receiver mounted units the air then passes into a 270 or 500 litre air receiver which also acts as a moisture separator.
Lubricant contained in the oil reservoir flows under differential pressure to an air cooled oil cooler and oil filter, before being injected into the compression element where it cools, seals and lubricates the compression process.
A low noise cooling fan provides dedicated air cooling to the aluminium oil cooler and aftercooler ensuring optimum running temperatures under all operating conditions.
A thermostatically controlled oil cooler bypass ensures that optimum operating temperatures are achieved quickly following start-up and maintains the oil temperature at low operating loads.
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 protects the unit against over-pressurisation.
The main drive and fan motors are protected against overload.
The Elektronikon MkV Graphic controller accurately monitors pressure via a pressure transducer mounted at the compressor discharge and opens and closes the intake valve 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 minimises 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.