Atlas Copco XAS96 DdG Manuel D'instructions page 9

2. LEADING PARTICULARS
2.1 D
ESCRIPTION OF SAFETY PICTOGRAMS USED IN
THIS MANUAL
This symbol draws your attention to dangerous
situations. The operation concerned may endanger
persons and cause injuries.
This symbol is followed by supplementary information.
Fig. 2.1 General view of XAS96 DdG, DdG IT with open door
(adjustable towbar with brakes is option)
2.2 G
ENERAL DESCRIPTION
The XAS96 DdG, DdG IT is a silenced, single-stage, oil-injected
screw compressor, built for a normal effective working pressure of
7 bar.
– Engine
The compressor is driven by an oil-cooled diesel engine.
The engineÕs power is transmitted to the compressor 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 element 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 first by
centrifugal force, second through the oil separator element.
The vessel is provided with an oil level indicator.
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– Regulation
The compressor is provided with a continuous regulating system and
a blow-down valve which is integrated in the unloader assembly. The
valve is closed during operation by outlet pressure of the compressor
element and opens by air receiver pressure 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 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
Engine and compressor are provided with an oil cooler.
The cooling air is generated by a fan, driven by the engine.
– Safety devices
A thermal shut-down switch protects the compressor against
overheating. The air receiver is provided with a safety valve.
The engine is equipped with low oil pressure and high oil temperature
shut-down switches.
– Frame and axle
The compressor/engine unit is supported by rubber buffers in the
frame.
The standard XAS96 DdG, DdG IT has a non-adjustable towbar with
a towing eye.
As an option the unit can be equipped with an adjustable towbar, an
overrun and parking brake and towing eyes type AC, DIN, ball, ITA,
NATO or GB.
The new braking system consists of an integrated parking brake and
overrunbrake. When driving backwards the overrunbrake is not
engaged automatically.
– Bodywork
The bodywork has openings at the shaped front and rear end for the
intake and outlet of cooling air and specially 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 behind a transparent panel at the right hand/ rear end corner.
– Data plate
The compressor is furnished with a data plate showing the type, serial
number and normal working pressure (see chapter 10).
– Generator
The built-in generator is driven by a multi V-belt drive. The
generated current can be drawn via 3 sockets (3 x 16 A,
1 x 3 phases, 2 x 1 phase). The compressor and the generator of the
XAS96 DdG, DdG IT may not be used simultaneously.
I M
NSTRUCTION ANUAL
9