Leading Particulars; Description Of Safety Pictograms Used In This Manual; General Description - Atlas Copco XAS 175 Dd Instruction Manual

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 XA(S)175 Dd
(adjustable towbar with brakes is option)
2.2 G
ENERAL DESCRIPTION
The XA175 Dd, as well as the silenced version XAS175 Dd is a
portable, single-stage, oil-injected screw compressor, built for
a normal effective working pressure of 7 bar.
– Engine
The compressor is driven by an air/oil-cooled KHD diesel
engine.
– Compressor
The compressor casing houses two screw-type rotors,
mounted on ball and roller bearings. The female rotor, driven
by the engine, drives the male rotor. The male rotor has four
lobes and the female rotor has six flutes. Thus, the male rotor
revolves at 1 1/2 times the speed of 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.
– Regulation
The compressor is provided with a continuous regulating
system and a blow-down valve. 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
The compressor is provided with an oil cooler.
The cooling air is generated by a fan, driven by the
compressor element.
L W A
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– 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 a low oil pressure shut-down
switch and/or a temperature shut-down switch.
– Frame and axle
The compressor/engine unit is supported by rubber buffers in
the frame.
The standard XA(S)175 Dd has a non-adjustable towbar with a
towing eye and an overrun and parking brake.
As an option the unit can be equipped with an adjustable
towbar and a ball coupling type DIN, ITA, NATO or GB.
– Bodywork
The bodywork has openings at the shaped front and rear end
for the intake and outlet of cooling air, hinged side doors for
maintenance and service operations. The XAS175 Dd
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 small transparent panel at the
right hand/ rear end.
– Data plate
The compressor is furnished with a data plate showing the
serial number, maximum final pressure and normal working
pressure (See chapter 9).
I M
NSTRUCTION ANUAL
9