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6
Setting the pressure bands
Gardner Denver
16
6 Setting the pressure bands
Danger
When the system is in stand-by mode, i.e. the green
LED is flashing, the compressor can start
automatically at any time.
6.1
About pressure bands
The range between the upper and lower pressure
settings is referred to as the pressure band.
Two pressure bands are available. These are called p1
and p2.
p1 is the normal (default) pressure band and is
used whenever p2 is not active.
p2 is an alternative pressure band that can be
activated if a different line pressure is required.
6.2
Regulated Speed Models
On VS models, software in the GD Pilot TS controller
varies the motor speed to exactly match the demand for
compressed air.
Due to the nature of the rotational speed control
software, there are two pressure settings:
the upper setting (p1 Cut-Out Point/p2 Cut-Out
Point) and
the lower setting (p1 Target Pressure/p2 Target
Pressure).
The lower pressure setting indicates the pressure which
should be kept constant in the distribution system.
The upper pressure setting is the figure at which the
compressor will have stopped delivering air and will go
off-load.
For example
:
p1 Cut-Out Point:
10.0 bar
p1 Target Pressure: 9.5 bar
The rotational speed of the machine will vary between
minimum and maximum to maintain the p1 Target
Pressure of 9.5 bar.
If the line pressure reaches the upper pressure of
10.0 bar due to no or low air demand, the compressor
will go off-load and the run-on timer is activated.
6.3
Fixed Speed Models
On fixed rotational speed models, there are also two
pressure settings:
the upper setting (p1 Cut-Out Point/p2 Cut-Out
Point) and
the lower setting (p1 Cut-In Point/p2 Cut-In Point)
The lower pressure setting is the pressure at which the
compressor will go on-load.
The upper pressure setting is the figure at which the
compressor will go off-load.
For example
:
p1 Cut-Out Point
: 10.0
bar
p1 Cut-In Point
:
9.5 bar
At the upper setting, the intake regulator valve within
the machine will close and the compressor will go off-
load, delivering no more air. The run-on timer will also
be started.
At the lower setting, the intake regulator valve will open
and the compressor will go back on-load, delivering full
output again.
6.4
Setting the p1 Pressure Band
Pressure is set in the
Settings > Control
menu.
1) Touch
p1
Target Pressure
or
p1 Cut-In
Point
.
2) Use the keypad which will appear to enter your
desired setting (the permissible pressure limits are
displayed on the keypad screen).
3) Confirm the entry by pressing
OK
.
The display will revert to the previous screen.
4) Touch
p1-Cut-Out Point
.
Note
The upper pressure setting must be at least 0.3 bar
higher than the lower pressure setting.
The controller checks whether the value set can be
used. To prevent excessive wear of your compressor,
the difference should preferably be no less than 0.5 bar.
5) Enter your required setting using the keypad.
6) Confirm the entry by pressing
OK.
VS
FS
VS
FS