User manual

2920 1475 00
10
Instruction book
pressure), solenoid valve (Y1) is de-energized. The plunger of
the valve moves downwards by spring force:
1. The plunger of solenoid valve (Y1) shuts off the supply of
receiver pressure towards chamber (8).
2. Control pressure present in chamber (8) is vented to
atmosphere through loading solenoid valve (Y1). Unloading
valve (3) closes by spring force.
3. Valve (12) is pushed downwards releasing receiver pressure
through flexible (30) and channels (10 and 29) towards the
air inlet.
4. A small flow of air remains drawn in through hole (9) and
channel (10), and is blown from receiver (17) via flexible
(30) to the air inlet.
5. Air delivery is stopped (0 %), the compressor runs unloaded.
Loading
When the net pressure decreases to the lower limit of the
working pressure (loading pressure), solenoid valve (Y1) is
energized. The plunger of solenoid valve (Y1) moves upwards
against spring force:
1. The plunger of solenoid valve (Y1) opens the supply of
receiver pressure towards chamber (8). Unloading valve
(3) opens against spring force.
2. Receiver pressure also pushes valve (12) upwards, shutting
off blow-off channels (10 and 29).
3. Air delivery is resumed (100 %), the compressor runs
loaded.
1.2.5.2 GA/GA W 200/315
The operation of the system is similar to that of GA90/160,
except that GA/GA W 200/315 are equipped with two
compressor elements, each provided with an unloader, check
valve and oil stop valve.
1.3 Elektronikon
®
control system
In general, the Elektronikon regulator has following functions:
- automatic control of the compressor
- protecting the compressor
- monitoring components - service warning
- automatic restart after voltage failure
1.3.1 Automatic control of the compressor
The regulator maintains the net pressure between programmable
limits by automatically loading and unloading the compressor.
A number of programmable settings, e.g. the unloading and
loading pressures, the minimum stop time and the maximum
number of motor starts are taken into account.
The regulator stops the compressor whenever possible to reduce
the power consumption and restarts it automatically when the
net pressure decreases. In case the expected unloading period
is too short, the compressor is kept running to prevent too-
short standstill periods.
Warning A number of time-based automatic start/stop
commands may be programmed. Take into
account that a start command will be executed (if
programmed and activated), even after manually
stopping the compressor.
1.3.2 Protecting the compressor
Shut-down and motor overload
If the temperature at the outlet of the compressor or at the outlet
of the compressor element exceeds the programmed shut-down
level, the compressor will be stopped. This will be indicated
on the control display.
The compressor will also be stopped in case of overload of the
drive motor or in case of overload of the fan motor(s).
Consult the safety precautions as mentioned in section 4 and
remedy the trouble. See also the User manual for Elektronikon
regulator, section Status data menu.
Shut-down warning
If the regulator detects a temperature just below the programmed
shut-down level, this will be indicated on the control panel to
warn the operator before the shut-down level is reached.
The message disappears as soon as the warning condition
disappears.
1.3.3 Service warning
A number of service operations are grouped (called Level A,
B, C, ...). Each level has a programmed time interval. If a time
interval is exceeded, a message will appear on display (2-Fig.
1.9) to warn the operator to carry out the service actions
belonging to that level. See section 4.