Atlas Copco XAS 130 DD7 - Adjustments and Servicing Procedures; Adjusting the Continuous Regulating System

53
Instruction Manual
5. ADJUSTMENTS AND SERVICING PROCEDURES
5.1 ADJUSTMENT OF THE CONTINUOUS REGULATING SYSTEM
Fig. 5.1
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 to lower it by turning the adjusting wheel
clockwise and anti-clockwise respectively.To adjust the normal
working pressure, proceed as follows:
1. Start and warm up the engine (see section 3.2).
2. With the outlet valves (AOV) closed, pull out the knob, adjust the
regulating valve (RV) until a pressure of X bar(e) 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) just enough to let the engine (E) run
at maximum speed. The working pressure must be Y bar(e) (see
table); adjust if necessary with regulating valve (RV).
5. Check the engine maximum speed. Adjust the maximum speed
by means of adjusting eccentric nut on top of speed regulator
(SR).
6. Close the outlet valves (AOV), check that the pressure is between
Z1 and Z2 bar(e) (see table). Lock the regulating valve (RV) by
pushing the knob down.
7. Check the operation of the solenoid valve (SV
SR
) when equipped
with a generator.
Table
Without generator
X
bar(e)
Y
bar(e)
Z1 – Z2
bar(e) bar(e)
XAS 67 DD -
XAS 130 DD7 8.5 7 8.3 – 8.7
XATS 67 DD -
XATS 125 DD7 11.8 10.3 11.6 – 12
XAS 77 DD -
XAS 150 DD7 8.5 7 8.3 – 8.7
XAS 97 DD -
XAS 185 DD7 8.5 7 8.3 – 8.7
With generator