ALE Series

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Superior unit design for energy saving
 New high-efficiency screw design enhances efficiency
Completely resigned 2-stage compressor air end and reduced pressure loss within the package result in an 8% increase in efficiency. The water-cooled inter-cooler and after-cooler also feature the industry's first plate-fin design, thus reducing air pressure loss to one fifth
Efficient energy saving with "Energy-Saving Logic" which minimize discharge pressure fluctuation (ALE/FE)
Energy-Saving Logic with optimum capacity controls and superb control efficiency is a standard feature.
Minimization of capacity controls
  •  Pressure control range
Optimum control method selected
  •  Loaded-unloaded switching operation
Unloaded operation is forcibly performed at every capacity control cycle (23 seconds) by the "Energy-Saving Logic" An excessive operation is eliminated as the unloaded start pressure is lowered

High performance screw unit (ALE-FE)
 A completely new design of the two-stage compressors unit and a reduction in package internal pressure losses resulted in an energy saving by 8% over existing models Furthermore, a plate-fin, first in the industry, was incorporated for the water-cooled, inter cooler and after cooler, reducing the air pressure loss to 1/5

Ultimate clean air (ALE-FE)
The oil-free design introduces absolutely no oil to the rotor chamber in process. Stainless steel shaft-seal rings are used to prevent the generation of carbon dust, and Kobelco's patented twin atmospheric shaft vents prevent lubricating oil from contaminating the compression chamber even during extended periods of unloaded operations.

Improved maintainability
Extended overhaul schedules
  • Recommended overhaul schedule for the 2nd stage was extended to every 6 years, whereas the 1st stage was extended to every 9 years (for an annual operation of 8000 hours).
  • Annual maintenance involves changing the oil, oil filter element and exhaust cleaner only
Frequency of capacity control operations
  • The life is extended to six times that of conventional models, with reliability and maintainability also improved.

Capability with 1.03 MPa specifications
All models are equipped with a compressor main unit that can operate with pressure of up to 1.03 MPa.

Improvement on durability for ambient
Reviewing the total cooling system including design of coolers and cooling fan with safety margin, the compressor can operate even under ambient temperature of 45oC

*Long-time continuous operation at ambient temperatures of 40oC or higher may shorten lifetime of components such as electric equipment and O-rings comparing with normal operation
Totally enclosed fan-cooled motors are adopted to increase motor durability. (ALE-FE)
Totally enclosed fan-cooled (TEFC) motor with enough capacity is selected to reduce the motor coil temperature and motor bearing temperature, leading significant improvement of reliability. Motor coil thermal detector is equipped for safety aspect
Protection features

Various improved protection for Electric parts.
  • Momentary interruption protection : Within 0.5 sec. 
The compressors unit does not stop even when an momentary power failure (momentary power interruption, momentary power drop, temporary blackout) occurs, as long as the interruption time interval is less than the set value. The compressor unit is stopped when the power interruption duration exceeds the set value.
  • Built-in 12,000-V lightning surge killer and noise filter.
  • Automatic reset from power failure : 0.5 to 20 sec.

Noise Reduction   
Pulse noise reduced by the perforated plate silencer, whereas the blade noise from the exhaust fan is reduced by optimum louver, thereby realizing top of its class low noise levels.


Exhaust cleaner that requires no oil mist breather piping (standard equipment with FE,ALE and AVE)
Conventional countermeasure for oil mist is discharging the oil mist outside of package by using oil mist breather piping, which may cause the environmental problem. To avoid pollution, it was necessary to install filter on the end of piping or corona separation-type mist collector. Newly developed Exhaust Cleaner utilizes super fine filter which can be installed inside the compressor package, and no more breather piping is required.
This Exhaust Cleaner has its self oil separation and recovery function.
This can prevent differential pressure increase and realize long term maintenance interval.
  • Oil separation performance: 99% or more (to a level where oil smoke cannot be verified visually)
  • Equipped with separated oil self recovery function



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