13-17-621 Page 58
Automatic Mode
This is the default operating mode, where the machine attempts to regulate in the most efficient manner
possible. The capabilities of the machine and profile of the compressed air demand will be utilized by the
controller in this operating mode. In periods of light demand the compressor motor will be automatically
stopped to save energy.
Constant Mode
Constant Mode is best used in situations where there are no long periods of unloaded operation or for
minimum response time to sudden demands. In constant mode the motor will be run continuously and the
controller will use modulation controls to match delivery to demand. On machines that have the ability to
run unloaded without depressurizing the reservoir, the reservoir will never be depressurized while the motor
is running. On variable speed machines, the speed of the motor will be adjusted to regulate the pressure.
Low Demand Mode
The Low demand mode reduces power consumption by relieving pressure in the reservoir during unloaded
operation. This mode is best used where there is moderate air storage and there are unloaded periods
during the day, but frequent motor starting and stopping is undesirable. This mode is identical to constant
mode during periods of moderate to high demand.
This mode of operation might not be available in all the machine configurations. It is available in systems
where the compressor uses the two-valve load/unload solenoid system. This option cannot be selected
when it is not available and will be grayed out. The Blowdown Timer is used, however, the Automatic Stop
Timer is ignored in Low Demand mode.
Sequencing Mode
The Sequencing mode of operation is similar to Automatic Mode but the compressor is part of a sequenced
group of machines. The controller controls the system with the combined data and operations of all the
compressors that are part of the sequenced group of machines.
Refer to the
Governor
sequencing manual
(
13-17-625
) for more information on operation in sequencing
mode.
Figure 75: Operating Mode
4.2.2 p1 Pressure Band
There are two types of Pressure settings:
Primary (p1)
and
Secondary (p2)
, these allow to the user to
configure two separate sets of pressure bands or curves that the compressor will operate within. The p1
value is the primary pressure band and defines the default pressure set points of the compressor while p2
