Gardner Denver
8 Starting and
Operating
25
8.3 Start
Inhibits
8.3.1
No air pressure demand
If there is no requirement for air on pressing the Start
button, the system will go into stand-by mode. The
green LED will then flash and the text field will read:
Attention: Start with Pressure
Requirement...
.
The compressor will start automatically when the lower
pressure setting is reached.
8.3.2
Discharge Pressure exceeds the permitted
value (see
Factory Settings
> Start
Protection
)
A safety circuit (start protection) prevents the drive
motor from trying to start against an excessive internal
residual pressure.
In this case, the system will go into stand-by mode. The
green LED will then flash and the text field will read:
Attention: Start after De-Pressurise...
.
The compressor will start automatically as soon as the
internal air pressure has dropped below the start
protection figure.
8.3.3
The ambient temperature is below the
permitted minimum start-up temperature
(see
Factory Settings> Minimum
Start Temperature
)
If the ambient temperature is below this figure, the red
LED will flash. When starting the compressor up,
Fault
E404
will be indicated
: Low Start
Temperature
.
In this case, arrange for the ambient temperature to be
increased and reset the fault (
Fault History >
button ).
8.3.4 Dryer
pre-run
If the compressor controls a dryer, the GD Pilot TS can
be programmed to start the dryer xx minutes before
starting the compressor in order for it to reach its
optimum operating temperature (
Settings >
Control > Dryer Pre-Run Time
).
Here as well, the compressor is initially switched to
stand-by. The compressor will then start automatically
once the dryer pre-run time has elapsed. The text field
will read:
Attention: Starting in “x” min
after Dryer Pre-Run...
.
Note
The minimum pre-run time is detailed in the dryer
operating instructions.
8.3.5
Start by Remote Control
If the controller is waiting for a start input from a remote
start location, the text field will read:
Attention:
Start by Remote Control...
.
8.3.6
Start with Timer Control
If the compressor is operating under timer control, the
text field will read:
Attention: Start with Timer
Control on <Day of the Week> at
<Time>...
.
8.4 Regulated
Speed
The controller attempts to maintain the line pressure at
the set target pressure
(Settings > Control > p1
Target Pressure
and
Settings > Control >
p2 Target Pressure)
by varying the motor speed
to exactly match the demand for compressed air.
As line pressure rises, the maximum permissible
rotational speed is constantly calculated to prevent the
maximum permissible motor output from being
exceeded. For example, the maximum rotational speed
at a line pressure of 6 bar will be higher than at a line
pressure of 10 bar.
VS
