4. Design and functioning
22
4.3
Water circuit
(see fig. 2, fig. 3, fig. 4)
The water flows from the pressure tank (-5-) through the
water cooler (-20-) and water filter and is then injected
into the screw compressor (-4-).
The entire water circulation is based on differential
pressure in the system. Thus, water is injected into the
screw compressor at a tank pressure of 10 bar
(145 PSI) with ca. 5.5 bar (80 PSI), for example.
4.4
Air circulation
(see fig. 2, fig. 3, fig. 4)
The suctioned air makes it way into the screw compres-
sor (-4-) via the suction filter (-1-). The injected water
cools air during the compressing process and the
resulting compressed air – water mixture tangentially
flows into the pressure tank (-5-). Thereby, the water is
separated extensively from the compressed air and
delivered into the mains via the pressure holding and
non-return valve (-9-).
4.5
Control
(see fig. 5 and fig. 6)
(Please also see the operating instructions for the
compressor control DELCOS XL)
System downtime
•
Solenoid valve (-25- (Y4)) is deenergized (open)
when the system is shut down, solenoid valve
(-26- (Y11)) is also deenergized (closed).
•
The pressure vessel (-6-) is depressurized to
atmospheric pressure via the solenoid valve
(-25- (Y4)) and the orifice (-21- fig. 5 or -5- fig. 6).
•
The water stop valve (-30- (Y10)) is closed.
Starting up the system
•
The drive motor (- 3 -) starts up.
•
The compressor draws air in via the air filter; a
certain quantity is blown off again into the intake
zone via the solenoid valves (-25-(Y4)) and
(-26-(Y11)) and via the orifice (-21- fig. 5 or -5- fig. 6).
•
This way, constant pressure of approx. 4 to 4.5 bar
is maintained in the pressure tank (- 6 -), as the
pressure holding non-return valve (-7-) still remains
closed at this pressure level.
•
The water supply of the screw compressor (- 4 -) is
provided by the drop in pressure between the
pressure tank (-6-) and the injection site in the
screw compressor.
•
If pressure in the load system falls below the
minimum pressure programmed on the control
system, the solenoid valve (-25-(Y4)) is energized
(closed). Pressure then continues to build up in the
pressure reservoir (- 6 -).
•
At a tank pressure of ca. 4.5bar/65 PSI, the
pressure holding non-return valve (- 7 -) opens.
•
The compressed air transportation into the mains
has begun.
Stopping the system:
•
After pressing the OFF button on the control panel
of the compressor control system DELCOS XL, the
magnet valve (- 25 - (Y4) is de-energized (opened)
and the solenoid valve (-26-(Y11)) is energized
(opened) when the drive motor is running.
•
The pressure reservoir (-6-) is depressurized to a
constant pressure of 4 to 4.5 bar.
•
The drive motor (-3-) reduces its number of revs to
the set minimum value and comes to a standstill
after 30 seconds have passed.
•
Once the drive motor has stopped, solenoid valve
(-26-(Y11)) is deenergized (closed) and the
remaining pressure in the reservoir is discharged via
the orifice (-21- fig. 5 or -5- fig. 6).
Speed control operation
Speed is controlled using a software-implemented PI
regulator that adapts the RPMs according to the need
for compressed air.
The controller attempts to maintain the mains pressure
between the values set in the control for max. and min.
mains pressure (target pressure).
Summary of Contents for D110H RS
Page 2: ......
Page 58: ...11 Annex 56 11 2 Layout plan 11 2 1 Layout plan D110H RS Fig 32 all dimensions in mm...
Page 59: ...11 Annex 57 Fig 33 all dimensions in mm...
Page 61: ...11 Annex 59 Fig 35 all dimensions in mm...
Page 63: ......
