TM
Base Load Sequencing (BLS) 10
January 2015
USA
65 /80
p1 Cut-In Point
The minimum line pressure at which the BLS
switches on the next available compressor.
p2 Cut-Out Point
The maximum line pressure in the p2 pressure
band at which the BLS switches off the compres-
sor at the far right of the sequence.
p2 Cut-In Point
The minimum line pressure in the p2 pressure
band at which the BLS switches on the next avail-
able compressor.
Timer Start Enabled
Activates the programmed start/stop settings for
the BLS Timer Control, in order to start or stop the
entire BLS group; e.g., on weekends.
p2 Timer Enabled On/Off
Activates the programmed settings for the BLS
Timer Control for the p2 pressure band, in order to
activate the second pressure band for the BLS.
Behavior
Start Delay
Switch Off Delay
Load Net in
Network Size
Select a Setting
Behavior
OK
Fig. 10-10: BLS "
Behavior
" menu
NOTE
This menu must be unlocked using the "Service
Level" code in order to make changes to the set-
tings.
From this menu, the operating behavior of the BLS
group can be adjusted to the operating conditions.
Start Delay
When the line pressure drops below the minimum
value (
Pressure Demand
), the first compressor is
switched on immediately. The next compressor is
not switched on until the programmed start delay
time has elapsed. Staged start-up ensure that the
load on the local power supply is increased uni-
formly.
Switch Off Delay
(
RS
)
When the master calculates that the compressed
air demand in the network has dropped sufficiently
to switch off one slave, a delay time (called the
Switch Off Delay) is activated. If the compressed
air demand remains low during this delay time,
then the slave to the far right of the BLS sequence
is switched off and the remaining compressors
cover the demand for compressed air.
If the compressed air demand rises again before
the programmed switch off delay has elapsed,
then the slave is not switched off. This prevents
the compressors from being switched on and off
unnecessarily.
Load Net in
If the BLS is activated manually or by the pro-
grammed BLS Timer Control, the compressed air
network is filled in the set time and only the num-
ber of compressors required to fill the compressed
air network within this time period are switched on.
The shorter the time setting, the more compres-
sors are switched on.
Network Size
The master controller uses this value as a factor
in performing calculations while the line pressure
moves within the pressure band. This value should
be changed only in case of severe variances in the
compressed air demand.
The value is used to calculate how many compres-
sors must be switched on (or off) to match the rise
(or fall) in line pressure.
If the line pressure drops and the controller cal-
culates that more than two compressors are re-
quired, for example, in order to cover the current
demand for compressed air, then one or more
compressors are started immediately as a preven-
tive measure, instead of waiting until the minimum
line pressure has been reached. The same occurs
in reverse if the line pressure rises.
If the Network Size is set too large, then the con-
troller will start (or stop) more compressors than
necessary in order to counteract the pressure rise
(or fall). Change the standard value only if the
compressed air demand varies severely.
Enter a percentage "a" on the basis of a ratio of
network volume size to the available volume flow
supply from the group. This is calculated using the
following formula:
a = (100 * b) / c
where
a = Network Size (%)
b = Network volume size (m
3
)
c = Total supplied volume flow (m
3
/min)
Summary of Contents for GD PILOT TS Series
Page 78: ...TM 78 80 USA January 2015...
Page 79: ...TM January 2015 USA 79 80...