15 Base Load Sequencing (BLS) (Optional)
Gardner Denver
60
15.10 BLS Settings Button
Touch the
Settings
button to view and adjust the BLS
settings.
Fig. 60
Settings BLS
button
15.10.1 Base Load Sequencing On/Off
BLS can only be turned on when the number of slaves
is greater than zero. If base load sequencing is
switched on, the slaves will be controlled by the master
and will ignore their local setpoints.
If base load sequencing is switched off, the slaves will
run independently from the master and will use their
local setpoints. The BLS page will continue to display
the group.
15.10.2 Setpoints…
1) p1 Cut-Out Point
Maximum line pressure at which the BLS will shut down
the compressor on the far right in the sequence.
2) p1 Cut-In Point
Minimum line pressure at which the BLS will activate
the next available compressor.
3) p2 Cut-Out Point
Maximum line pressure in 2nd pressure band at which
the BLS will shut down the compressor on the far right
in the sequence.
4) p2 Cut-In Point
Minimum line pressure in 2nd pressure band minimum
at which the BLS will activate the next available
compressor.
5) Timer Start Enabled On/Off
Enables the scheduled BLS timer Start/Stop settings to
start or stop the whole BLS group, e.g. at the weekend.
6) p2 Timer Enabled On/Off
Enables the scheduled BLS timer settings for pressure
band p2 to activate the 2nd pressure setting for the
BLS.
15.10.3 Behaviour...
1) Start
Delay
The first compressor is activated immediately but the
next compressor will not be activated until the
scheduled Start Delay time has elapsed.
2)
: Switch Off Delay
When the master determines that the compressed-air
requirement in the network has dropped sufficiently to
allow for another slave to be switched off, a delay time
is activated. If the compressed-air requirement stays
low during this delay time, the next slave in the
sequence is switched off and the remaining
compressors satisfy the compressed-air requirement.
If the compressed-air requirement increases again
before the scheduled Switch-Off Delay time has
elapsed, the slave will not be shut down and the delay
time will be reset. This is designed to prevent
unnecessary compressor starts and stops.
3) Load Net in
If the BLS is activated manually or by the scheduled
BLS timer, the net will be loaded within the set time by
activating only as many compressors as required to
load in the net within that time.
4) Network
Size
Note
Only modify the default value in case of significant
fluctuations in the compressed-air requirement.
SM 1925
VS
