Adjustments 8
22
ST16135-00E
8.5
Pressure Control - RS Compressors
The PL load and PU unload pressure may be adjusted from the
default settings shown in Section 3, Product Information in the
range of 6, 7, 8, 9 or 10 bar.
In menu P10 match the PL load to the nominal bar figure required,
the PU unload 0.5 bar above, servo valve pressure is 1.0 bar
above the nominal.
Manual servo valve adjustment is necessary to match pressure
selected on the controller.
8.6
Servo Valve (Fig. 8.2)
The servo valve controls pressure when there is no demand for
air, settings shown in Section 3, Product Information are a
maximum and must not be exceeded.
Access to the servo valve requires the cabinet front door to be
opened and the top cover panel removed, refer to Section 9,
Servicing.
Fig. 8.2 - Servo Valve
If the servo needs adjustment or a lower pressure is required then
carry out the following procedure.
(a)
Turn the electrical supply on at the isolator, disconnect the
air outlet valve from the system and fit an air silencer.
(b)
Select continuous run from P21 Service Menu (access
code required), start the compressor open the outlet valve
and allow to warm up.
(c)
Release locknut (A), turn grub screw (B) anti-clockwise for
two turns and close the outlet valve.
(d)
Screw in grub screw (B) clockwise to increase pressure to
the desired setting, allow pressure to stabilise.
(e)
Open and close the outlet valve, allow pressure to
stabilise, check the pressure gauge reading.
(f)
If low turn grub screw (B) clockwise to increase or anti-
clockwise to decrease pressure.
(g)
With the correct pressure showing on the gauge secure
the servo locknut (A).
(h)
Reset the compressor from continuous run back to
automatic stop/start operation.
Stop the compressor, isolate from electrical supply and remove air
silencer, re-connect the outlet valve to the system.
A
B