Kobelco KNW Series, Instruction Manual

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KIMA00H1 (0204) 1
1. GENERAL DESCRIPTION
1.1
Compressor
The Kobelco KNW Series air compressor is a heavy duty, two-stage,
rotary screw design that provides completely oil-free compressed air.
Oil-Free compressed air is guaranteed by a unique seal arrangement
that separates the bearings and gear chambers from the compression
section of each stage. The dual vent seal design insures that no oil or
its vapor can contaminate air that is being compressed.
The two-stage design provides higher output pressures at a lower
operating temperature than would be available from a single-stage
design. Both compressor stages are mounted on a heavy duty cast
iron gear case for permanent alignment. The stages are driven
through precision machined gears, selected for optimum operating
speed to maximize efficiency and reduce rotor thrust.
Timing gears are used to separate the rotors and to assist in reducing
thrust on the rotors and the rotor bearings, thus extending bearing life.
The Kobelco KNW Series Oil-Free Air Compressor is a complete
operating system. A flange-mounted permanently aligned drive motor,
intercooler, aftercooler, capacity control valve assembly, lube oil
system, compressor controls, and related accessories, are all
mounted inside a sound attenuating steel cabinet. All compressor
mounting points are vibration isolated. Flexible connections between
the compressor assembly and the cabinet insure that no vibration, and
its related noise, are transmitted to the cabinet. The result is a very
stable and quiet running assembly.
The KNW Series compressor features a separately driven oil pump for
drive gear, timing gear, and bearing lubrication. The lube oil pump
starts first, then, after a brief delay, the compressor drive motor starts.
Starting of the drive motor is delayed to allow pressurized lubrication
of the bearings and gears during acceleration of the compressor. The
pump is also timed to stop after the compressor. Oil pressure is
maintained while the compressor coasts to a stop. Maximum
component life is assured by thorough lubrication of moving
components.
Another feature of the KNW Series is the direct operating capacity
control valve and bleed-off system. This unique valve design provides
for extended service intervals and eliminates the need for a bleed-off
cooler.
The KNW Series Compressor Operator Panel is a state-of-the-art
control system combining robust industrial controls with leading edge
operator interface and programmable logic controller technology.
Exclusive to KNW Series compressors is the GT Terminal, a versatile
graphic touchscreen display with clear graphics and user-friendly
operation, showing all necessary compressor information in an easy to
understand format.