Gardner Denver L07, Original Operating And Service Manual

Page: 37 / 60

8. Control system
35
8.5.3 Setting line pressure
(only L07RS-L11RS)
Speed is controlled with the aid of a PI controller
implemented in the software and is matched to the
demand for compressed air. In the
[ CONTROL MENU ]
menu you have to set the maximum line pressure
switching point (
CUT-OUT POINT
) and the
TARGET
PRESSURE
.
When the maximum line pressure switching point is
reached, the machine switches to off-load.
In the range between
TARGET PRESSURE
and
CUT-
OUT POINT
the speed of the machine is regulated
according to the compressed air requirement.
Example:
CUT-OUT POINT 10.0bar
TARGET PRESSURE 9.5bar
The speed of the machine is regulated according to the
need for compressed air so that the set pressure of
9.5 bar is maintained.
When the line pressure reaches 10.0 bar, the machine
switches to off-load.
Max. line pressure:
The max. line pressure is set in the
[ CONTROL MENU ]
-
sub-menu. The


+


keys have to be pressed at the
same time to do this. You are then taken to the main
menu. Use


to switch to the
[ CONTROL MENU ]
sub-
menu. Then please press the key.
The
CUT-OUT POINT
menu item now appears on the
display. Again pressing the

–
key causes the value to
flash. You can now correct (increase or decrease) this
value using


or

 . Then confirm the value set by
pressing the key.
Note
The control system checks whether the value set can be
used. The maximum line pressure
CUT-OUT POINT
must be at least 0.2 more than the
TARGET PRESSURE.
You may therefore have to first set the
TARGET
PRESSURE
. To prevent your compressor suffering from
excess wear, the difference between the
CUT-OUT POINT
and
TARGET PRESSURE
should not be too small.
Target pressure:
In the
[ CONTROL MENU ]
sub-menu please use


to
go to the
TARGET PRESSURE
menu item.
Pressing the key causes the value to flash.
You can now correct (increase or decrease) this value
using


or

 . Then confirm the value set by pressing
the key.
8.5.4 Setting time/date (timer)
The GD PILOT accumulator can bridge a loss of power
lasting between around two to three weeks. If power is
lost for longer periods, the timer's time and date are lost
and have to be entered anew.
Press the


+


keys at the same time. Use


to go
to the
[ TIMER CONTROL ]
sub-menu and press the
key. The date and time are displayed there in the
following format:
TU 30.10.07 12:10:34
If you press the key, the left-hand value (day of the
week) starts to flash. You can now use the


or


keys to set this. Then confirm the value by pressing the
key.
All values can now be set in succession using this
procedure. When the last value (seconds) has been
set, the timer is fully set and you can exit the menu by
twice pressing the


+

 keys at the same time.
8.6 Starting the unit
Danger
If the unit is ready, i.e. the green LED is flashing,
the compressor may automatically start at any time.
Use the main switch to switch the unit on.
If warning or fault messages appear in the third row of
the display, these first have to be rectified and
confirmed using the
key.
Then start the unit by pressing the

I
key on the DELCOS.
8.7 Switching off the unit
The unit is switched off by pressing the

 key on the
GD PILOT. However the unit will only stop after a 30-
second soft-stop.
The soft-stop is preset to protect the compressor.
Note
The unit may only be shut down using the emergency
off button in real emergencies. When shutting down
normally, please use the


key.
8.8 Emergency off button
The emergency off button is situated next the GD
PILOT. It is used to immediately shut down the unit.
Only use the emergency off button to shut down the
unit in emergencies. When shutting down normally,
always use the

 key.