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2. DELCOS 3100 Base-Load Sequencing
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The current delivery rate is output via an analogue
output (version RS only, optional in version SR).
2.3
Connecting slaves to BLS
2.3.1
Load request
Compressors K2 to K5 receive the on-load/off-load
commands from relay module A06 in the BLS system.
Relay responded means on-load operation.
The relay contacts must switch into the system
controlling the slaves. To prevent the machine's normal
on-load/off-load controller from influencing BLS
operation, their setting must be changed accordingly.
2.3.2
Fault message
Fault messages from the slaves (K2 to K5) can (optio-
nally) be wired to the terminals on the master relay
module. Power circuit closed means no fault.
Version RS and SR only:
For compressors with DELCOS 3100, it makes sense to
wire back the "operating" message. Otherwise, the
“disconnect” function faults and the analogue output
delivers incorrect values (e.g. slave is manually
switched off = not malfunctioning => is requested and
included in delivery rate calculation
2.4
Connecting the master to BLS
If BLS is not activated [OFF operating mode] or has
failed [OPERATION —], the master machine (K1) is
controlled with the network pressure switching points
set in the [control] menu.
As soon as BLS is activated [ON/TIMER], the master
machine is connected by software to the BLS system.
On-load and off-load commands then only come from
the BLS system. The fault message from the master
(K1) is recorded internally and is therefore always
available.
2.5
Remote control
Using external contacts, it is possible to activate/
deactivate BLS by remote control and switch the BLS
system or the machine itself to a second pressure
range.
At the installation stage, coupling relays must be used if
line length between the machine and the external
contacts exceeds 20 m.
2.5.1
Remote-controlled pressure
changeover
The BLS system can be forced to switch to a second
pressure range via input E07.5 (module A06) (see
Chapter on [TIMER CONTROL] menu). While pressure
is being switched over, you will see the p2 symbol
flashing in front of the display of current network
pressure.
2.5.2
Switching off by remote control
[OPERATION ON]
BLS can be switched off temporarily via input E07.4
(module A06). Switching off in this way is not the
equivalent of deactivating BLS manually. It only
disconnects the load requests to all machines. The
“BLS active” message remains in tact – in contrast to
manual shutdown.
2.5.3
Switching on by remote control with
[OPERATION TIMER]
When BLS is shut down by the timer, it can be forced to
switch on via input E07.4 (module A06).