Kobelco Screw Compressor Manual

65 - 270kW Class
Discharge air volume 10.5 - 49.3 m3/min(0.69MPa)

And our Kobelco KNW Series is the longest lasting, most energy-efficient, oil-free compressor system in the world. Plus, choose from a variety of top-name vacuum pumps and filters, and a vast inventory of Rogers Machinery parts. The standard Kobelco Ka Series Compressor is equipped with an industrial quality motor. The motor is suitable for service with 480 volts, 240 volts and in some cases as low as 208 volts with a standard three phase 60 Hertz AC input. The motors are equipped with a NEMA standard C-face.

Ultimate high efficiency and energy saving thanks to Inverter equipped Two-stage Oil-free screw

No matter what the load condition, Kobelco inverter control achieves ideal energy savings without unnecessary motor rotation. Instantly responding to any changes in demand pressure, pressure fluctuation could be minimized within ±0.01 MPa, thus supplying the required air volume with precisely controlled operating energy.

Equipped with the world's first IPM motor

IPM motor achieves higher efficiency than either general-purpose induction motors or high-efficiency induction motors.

Kobelco Air Compressor User Manuals Download - ManualsLib We have 1 KOBELCO KNW Series manual available for free PDF download: Instruction Manual KOBELCO KNW Series Instruction Manual (54 pages) Oil-Free Two-Stage Air-Cooled Rotary Screw Air Compressors Kobelco KNW Series Manuals ManualsLib.

Specifically designed inverter couple with IPM motor can make a power-saving effect that no-conventional inverter can make.

Capability for high pressure applications

Air cooled unit (0.88 MPa), water cooled unit (0.93 MPa)

Line pressure control (Optional)

The compressor can be controlled by detecting the pressure from the air line.

● Maintain a necessary pressure in the line
● The best energy saving operation is possible with an optimized discharging pressure
● Keep track of the pressure losses (losses in electric power consumption)

High performance screw unit

A completely new design of the two-stage compressor unit and a reduction in package internal pressure losses resulted in an energy saving by 8% over existing models.Furthermore, a plate-fin, the 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

The oil-free design introduces absolutely no oil to the rotor chamber in the process. Stainless steel shaft-seal rings are used to prevent the generation of carbon dust, and KobelcoÕs patented twin atmospheric shaft vents prevent lubricating oil from contaminating the compression chamber even during extended periods of unloaded operations.

Improved maintainability

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 8,000 hours).

Kobelco Screw Compressor Manual

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 a pressure of up to 1.03 MPa.

Improvement on durability for ambient

Alternate operation function of two units-Graph display of operating history, weekly timer, daily report management, maintenance information, and operation status.

Built-in Higher harmonic reactor as standard

* Complies with harmonic suppression guidelines by the Japan Electrical ManufacturerÕs Association (JEMA)

Soft start by KOBELCO inverter

It reduces peak current when starting-up, thus ensuring smooth start-up and reducing power supply equipment cost.

Totally enclosed fan-cooled motors are adopted to increase motor durability.

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 compressor 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.
Example: Setting for recovery after power interruption: 5 sec.; power recovery standby time: 15 sec.

Pulse noise is 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.

Kobelco Oil Free Compressor

Exhaust cleaner that requires no oil mist breather piping

Kobelco Screw Compressor Manual Diagram

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 can realize long term maintenance interval.