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2. DELCOS 3100 Base-Load Sequencing
46
2.6.11
[VOL.COMP2...5] setting
(version RS and SR only)
This is where to set the delivery rate for the slave
compressors. Only enter delivery rates in the [m3/min]
unit.
2.6.12
[SWITCH OFF DELAY] setting
(version RS and SR only)
BLS knows all rates delivered by the slave compressors
and the current rate being delivered by the speed-
controlled machine. The [SWITCH OFF DELAY xy s]
time set here elapses if calculation shows that the
speed-controlled compressor can provide sufficient air
to take over the rate of air being delivered by the
current peak-load machine. The peak-load machine is
then disconnected.
The peak-load machine may be a slave or backup
compressor.
We recommend not setting this value too low so that
the new operating point can become established after
disconnecting the peak-load machine.
2.6.13
[START DELAY] setting
The start delay setting (setting range 5 to 30s) makes it
possible to delay the response to falls in network
pressure. As a result, machines cut in on a gradual
basis. The value selected should be at least the highest
star-delta time of the compressors connected
If the CUT-IN POINT is understepped, the first
compressor is connected in without delay.
2.6.14
[LOAD NET IN] setting
By setting [LOAD NET IN xy min], only as many
compressors will be started as are necessary to fill the
network within the given time. This avoids connecting
the entire station unnecessarily.
This function is not active after a power failure. In this
case (of emergency), compressors are connected in the
normal way.
If the BLS system is started manually [OPERATION
ON], using the timer or by remote control, and if current
network pressure is below setpoint pressure, the
compressed-air network is filled on a controlled basis
Example:
At 6 a.m. on Mondays, the compressed-air network
must be 8.0 bar. In order, for example, to minimise idle
output during this period, as few compressors are to be
switched on as possible.
Solution:
The master compressor is activated at 5:45 hrs by its
timer for activating the BLS system. The BLS operating
mode is set to 15 min at [TIMER] and [LOAD NET IN].
Network pressure of 8.0 bar is reached after 15 min at
the latest, with as few compressors being switched on
as possible.
2.6.15
[NET VOLUME] setting
(version RS and SR only)
To calculate ideal control behaviour, the BLS system
requires the network volume of the compressed-air
station. This is where you enter the sum of all local
reservoirs.
Attention:
Correctly setting the [NET VOLUME] parameter is
crucial to achieving satisfactory base-load sequencing!
•
Setting value too low (slow): in cases where
consumption varies widely, the BLS system is
unable to identify in the range between CUT-IN
POINT and CUT-OUT POINT that it needs to
disconnect compressors as a precautionary
measure.
•
Setting value too high (sensitive): the BLS system
disconnects compressors prematurely in the range
between CUT-IN POINT and CUT-OUT POINT
2.6.16
[VOLUME OF NET] setting
(version FS only)
To calculate ideal behaviour, the BLS system requires
the main characteristics of the compressed-air station.
•
Total rate delivered by BLS compressors [m
³
/min]
{without backup compressors}
•
Network volume [m
³
] {local reservoir volume in
immediate proximity}
Network size =
Network volume [ m
³
] x 100
Total rate delivered by
BLS compressors [m
³
/min]
Attention:
Correctly setting the [VOLUME OF NET] parameter is
crucial to achieving satisfactory base-load sequencing!
•
Setting value too low (slow): in cases where
consumption varies widely, the BLS system is
unable to identify in the range between CUT-IN
POINT and CUT-OUT POINT that it needs to
disconnect compressors as a precautionary
measure.