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Gardner Denver
15 Base Load Sequencing (BLS) (Optional)
61
The master controller utilises this figure to perform
calculations while the line pressure is within the
pressure band. The figure is used to calculate whether
too many compressors are switched on (or off) to match
the increase (or decrease) of line pressure.
If the line pressure drops and the controller calculates
that, for example, more than two compressors will be
needed to meet the current compressed-air
requirement, one or more compressors will be started
up immediately as a precaution, instead of waiting until
the minimum line pressure is reached. The same
happens in reverse in case of an increase of line
pressure.
If the user enters a network size which is too high, the
controller will activate (or shut down) more machines
than are required to deal with the decrease (or
increase) of pressure.
Enter a percentage (a (below)) based on a ratio of
network volume size to total delivery volume flow
available in the group, calculated on the basis of the
following formula:
a = (100 * b) / c
where
a = network size (%)
b = network volume size (m
3
)
c = total delivery volume (m
3
/min)
Note
The network volume size (b) should only be equivalent
to the volume of the compressed-air tank closest to the
compressor group. All pipework and any other
compressed-air tanks which may be installed further
along the network should be ignored.
15.10.4 Configuration. . .
1) Number of Slaves
Key in the number of slaves connected to the master.
2)
: Speed Regulated Slaves Yes/No
Select whether the slaves are rotational speed-
regulated or not.
Note
All slaves must be of the same type.
3) Transfer
Interval
Use this area to define the time interval at which the
sequence is reconstructed on the basis of the operating
hours (BLS) of the compressor. The transfer can be
disabled by keying in 0 hours.
4) Current
Sequence
The sequence can be defined manually, e.g. for test
purposes, or if a specific sequence is to run for a longer
period of time (Transfer interval = 0h).
15.10.5 Timer Control. . .
The scheduled BLS timer for Start/Stop and pressure
band p2 can be set here. To learn about the procedure
refer to chapter 11.
Note
These submenus are provided only for setting of the
timer channels. The timer for Start/Stop or activating the
second pressure band must be enabled in the
Setpoints
Menu.
(A BLS group which has been shut down by the timer
can be activated using a programmable input (see
chapter 10.1.11).
The p2 pressure band can also be activated using a
programmable input (see chapter 10.1.12).
15.11 Function Description
15.11.1 Control Algorithm
As long as the BLS is manually switched off, the slaves
will run independently from the master using their local
setpoints. The BLS page will only display the group.
If the BLS is activated manually or by the scheduled
BLS timer, the net will be pressurised within a set
period (Load Net in
)
, activating only as many
compressors as required to pressurise the net within
that time. After a power failure, this function is not
activated, because in that case it is essential for the net
to be pressurised as soon as possible.
VS