Leading Particulars; General Description - Atlas Copco XAS 400 JD IT4 HOP Instruction Manual

Leading particulars

General description

The XAS 400 JD7 IT4 is a silenced, single-stage, oil-
injected screw compressor, built for a nominal effective
working pressure of 7 bar (100 psi).
The XATS 400 JD7 IT4 is a silenced, single-stage, oil-
injected screw compressor, built for a nominal effective
working pressure of 10 bar (145.04 psi).
The XAVS 400 JD7 IT4 is a silenced, single-stage, oil-
injected screw compressor, built for a nominal effective
working pressure of 14 bar (203.05 psi).
All machines meet Tier 4I / Stage IIIB emission standards.
Engine
The compressors XAS 400 JD7 IT4, XATS 400 JD7 IT4
and XAVS 400 JD7 IT4 is driven by 4 cylinder in-line
liquid-cooled diesel engines.
The engine's power is transmitted to the compressor
element through a heavy-duty coupling.
Compressor
The compressor casing houses two screw-type rotors,
mounted on ball and roller bearings. The male rotor,
driven by the engine, drives the female rotor. The
compressor delivers pulsation-free air.
Injected oil is used for sealing, cooling and lubricating
purposes.
Compressor oil system
The oil is boosted by air pressure. The system has no oil
pump.
The oil is removed from the air, in the air/oil vessel at first
by centrifugal force, secondly through the oil separator
element.
The vessel is provided with an oil level indicator.
Regulation
The compressor is provided with a continuous regulating
system and a blow-off valve which is integrated in the
unloader assembly. The valve is closed during operation
by air receiver pressure and opens by air receiver pressure
via the compressor element when the compressor is
stopped.
When the air consumption increases, the air receiver
pressure will decrease and vice versa.
This receiver pressure variation is sensed by the regulating
valve which, by means of control air to the unloader and
an electronic engine speed regulator, matches the air
output to the air consumption. The air receiver pressure is
maintained between the pre-selected working pressure and
the corresponding unloading pressure.
Cooling system
The engine is provided with a liquid-cooler and
intercooler and the compressor is provided with an oil
cooler. For available options see chapter Available
options.
The cooling air is generated by a fan, driven by the engine.
Safety devices
A thermal shut-down sensor protects the compressor
against overheating. The air receiver is provided with a
safety valve.
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The engine is equipped with low oil pressure and high
coolant temperature shut-down sensors.
The electric system is equipped with a 12V main switch.
Frame and axles
The compressor/engine unit is supported by rubber buffers
in the frame.
The standard compressor has fixed towbar with brakes.
Bodywork
The bodywork has openings at the shaped front and rear
end for the intake and outlet of cooling air and hinged
doors for maintenance and service operations. The
bodywork is internally lined with sound-absorbing
material.
Lifting eye
A lifting eye is accessible when a small door at the top of
the unit is unlocked.
Control panel
The control panel grouping the air pressure gauge, control
switch etc., is placed at the right hand/ rear end corner.
Exhaust filter system
The exhaust system includes a new exhaust aftertreatment
system that meets strict installation standards and includes
a diesel particulate filter.