77
Regulation
Note
It is not possible to start up the compressor
if there is insufficient fuel is available.
Starting up: The control function is
inactive at start up, i.e. as the system rises,
the engine speed is lowered to idling and
the suction throttle closed. Once the diesel
engine has warmed up, the throttle/speed
control is activated pressing the load
button.
The throttle/speed control enables the
volume of air tapped (10) to be adjusted
infinitely between 0% and 100%.
The control valve (2) is connected to the
engine speed control lever over a second
set cylinder. When starting, the engine is
set to full load and the control valve is
open. The compressor (23) starts to
produce and pressure builds up inside the
container (13). When exceeding the
operating pressure the P-controller (3)
feeds the set cylinder of the controller with
air. Each change of the pressure at the
admission opening causes a proportional
pressure raise at the exit. This control
pressure operates the control cylinder.
Over the calibrated opening of the exhaust
air nozzle (5) the control air gets partly into
the atmosphere and any condensate will be
let off. The throttle valve closes (throttle-
type governor) and the engine speed will
be lowered (speed control). That way the
air volume will be adjusted variable to the
required air. If the air output drops down to
zero, the throttle valve is completely closed
and the engine runs under idle running
speed. Over the exhaust air nozzle (5) the
sucked in air will be let off over a leakage
cleft. When the pressure of the container
drops down the control pressure of the
controller drops down too; the throttle valve
opens and the engine speed will increase.
When turning off the engine the backlash
flap inside the controller will be closed
through the system pressure. The release
valve (3), which closes parallel to the
engine lifting magnet, looses power and
opens. The container pressure drops down
to zero.
4. Construction and functional description
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