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2. DELCOS 3100 Base-Load Sequencing
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2.6.3
Setting [OPERATION]
This is where BLS is activated and deactivated. If
activated BLS fails as a result of any of the above-
mentioned events, the display shows [OPERATION —]
until the fault is rectified. It is then possible to switch
back from [OPERATION —] to [OPERATION OFF].
When BLS is deactivated, no load requests are sent to
the slaves
The BLS system is timer-controlled by means of
[TIMER]. The BLS system receives the timer
information from the [TIMER CONTROL] menu which
must be programmed accordingly. The timer setting
is/can be used from the BLS (menu: [BASE LOAD
SELECT.]) and/or from the machine itself (menu:
[CONTROL MENU]) .
The timer LED on the sealed control panel is reserved
exclusively for the machine, i.e. does not indicate that
BLS is being controlled by the timer.
If a faulty clock is identified after a power failure, BLS is
switched back from [TIMER] to [ON]. The display shows
[WARNING BATTERY].
As the BLS system merely issues on-load/off-load
commands, it is assumed that all machines involved are
switched on or are on standby (waiting for pressure
request). This also applies to the master machine itself.
2.6.4
[CUT-OUT POINT / CUT-IN POINT]
setting (version FS only)
Network pressure range maintained by BLS. The
pressure band cannot be set to below 0.3 bar.
Particularly in small networks, this pressure band
should be selected as realistically as possible to ensure
maximum control stability.
If pressure changeover is activated in the [TIMER
CONTROL] menu (option), or if pressure changeover is
initiated via the ext. contact, BLS operates with the
[p
2
CUT-OUT POINT = xx bar] and [p2 CUT-IN POINT
= xx bar] values from the [TIMER CONTROL] menu.
Compressors cut in or out if network pressure leaves
the chosen range.
2.6.5
[CUT-OUT POINT / TARGET
PRESSURE] setting (version RS and
SR only)
Network pressure range maintained by BLS. The
difference between CUT-OUT POINT and "setpoint
pressure" cannot be set to below 0.3 bar. Particularly in
small networks, this pressure band should not be set
too low in order to keep control as steady as possible.
The [CUT-OUT POINT] and [TARGET PRESSURE]
settings produce the internal value for CUT-IN POINT.
If pressure falls below CUT-IN POINT, BLS switches
compressors on. CUT-IN POINT is calculated as
follows:
[CUT-OUT POINT]
∆
p
[TARGET PRESSURE]
∆
p
CUT-IN POINT
If pressure changeover is activated in the [TIMER
CONTROL] menu (option), or if pressure changeover is
initiated via the ext. contact, BLS operates with the
[p
2
CUT-OUT POINT = xx bar] and [p2 TARGET
PRESSURE = xx bar] values from the [TIMER
CONTROL] menu.
Compressors cut in or out if network pressure leaves
the chosen range
2.6.6
[BASE LOAD COMP] setting
This is where the base-load system currently scheduled
is displayed and/or set.
In version SR, the speed-controlled compressor is
permanently in first place. The base-load machine can,
therefore, be set within the 2 to (number of BLS slaves)
range.
In version RS, the speed-controlled compressor is
permanently in first place in the [SPEED REGULATION
ON] operating mode. The base-load machine can then
only be set within the 2 to (number of BLS slaves)
range. In [SPEED REGULATION OFF], the master
machine – in the same way as a standard machine –
participates in BLS. In this case, this setting value can
be set within the limits of 1 to (number of BLS slaves).
If a fault is identified in the base-load system, another
compressor (temporarily) takes over and delivers the
basic load. The actual base-load sequence is shown on
the status display described below. Once the fault is
rectified, the scheduled machine takes over again and
delivers the basic load.
Changing the setting has no effect on the remaining
changeover time for the BLS array.