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ADJUSTMENT OF THE CONTINUOUS PNEUMATIC REGULATING SYSTEM
The working pressure is determined by the tension of
the spring in the regulating valve (RV). This tension
can be increased to raise the pressure and decreased
by turning the adjusting wheel clockwise and
anticlockwise respectively.
To adjust the normal working pressure, proceed as
follows:
1. Start and warm up the engine.
2. With the outlet valves (AOV) closed, pull out the
knob, adjust the regulating valve (RV) until a
pressure of X bar is reached (see table).
3. Check the minimum speed of the engine. Adjust
minimum speed stop screw if necessary.
4. Open an outlet valve (AOV) sufficiently to let the
engine run at maximum speed. The working
pressure must be Y bar (see table); adjust if
necessary with regulating valve (RV).
5. Check the engine maximum speed. Adjust the
maximum speed by means of adjustable eccentric
nut on top of speed regulator (SR).
6. Close the outlet valves (AOV), check that the
pressure is between Z1 and Z2 bar (see table).
Lock the regulating valve (RV) by pushing the
knob down.
Modifying the set point above the
nominal working pressure can affect the
correct working of the unit and result in
failure. After the end test in the factory
the regulating valve is sealed. Only the
Atlas Copco customer center or an
authorized distributor may work on the
regulating valve.
Incorrect use/operation of the machine,
including modifying the working
pressure above the nominal pressure,
will void warranty.
Be aware not to touch hot parts when
the hood is open.
X (pressure at unload) Y(pressure at load) Z1 - Z2
Factory settings for 7 bar units* bar 7.7 6.5 7.5 - 7.9
psi 111.7 94.3 108.8 - 114.6
Settings for working pressure
of 7 bar
bar 8.3 7 8.1 - 8.5
psi 120.4 101.5 117.5 - 123.3
Settings for working pressure
of 10 bar
bar 11.9 10 11.7-12.2
psi 172.6 145 169.7-176.9
Settings for working pressure
of 12 bar
bar 13.6 12 13.2-14
psi 197.2 174 191.4-203
* The unit, XAS 88 (G) can work at 6.5 bar with 3 tools simultaneously at Ta 45°C, which is not
possible at 7 bar. Therefore the factory setting of the unit is 6.5 bar.
An outlet pressure of 6.5 bar is sufficient to reach a 6 bar working pressure at the point of use.
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