10 Base Load Sequencing (BLS)
60 / 80 GB October 2013
10 BASE LOAD SEQUENCING
(BLS)
The following chapter principally describes the
master controller in base load sequencing.
Where the slave controllers are concerned, it is
only necessary to set the address. See chapter
"Configuration / Setup RS485 Communication /
Setting up the communication parameters of the
slave compressor controller".
10.1 Base Load Sequencing
General description
The controller DELCOS XL can act as the master
controller for a base load sequencing group.
Up to three slaves can be connected to the master
via a serial link.
NOTE
All slave compressors must be of the same type,
i.e. either RS compressors only or FS compres-
sors only.
Base load sequencing function
The Base Load Sequencing feature is optional.
Base Load Sequencing has two functions:
One central superior controller (the master con-
troller) is utilised to control a group of com-
pressors in order to maintain the line pressure
within a narrow pressure band.
The master controller regularly changes the pri-
orities of the compressors in the group ensur-
ing that the running hours of all compressors
are equal.
System Requirements
A communication module (RS485:3 module) must
be installed in the master controller, if it has not
been pre-installed ex-factory.
Supported compressor group configurations
Type Description / requirement
FS-Master
FS-Slaves
One FS master can control up 3
FS slaves.
The rated volume flow of each
compressor within the base load
sequencing group should be
approximately the same as the
master.
RS master
FS-Slaves
One RS master can control up 3
FS slaves.
The rated volume flow of each
slave compressor should be equal
to or slightly less than the master.
RS master
RS slaves
One RS master can control up 3
RS slaves.
The rated volume flow of each
compressor within the base load
sequencing group should be
approximately the same as the
master.
Chart 10-1: Supported compressor group configurations
NOTE
One FS master cannot control any RS slaves.
10.2 Supported slave controllers
Supported slave controllers
The electronic slave controllers DELCOS 3100,
DELCOS PRO and DELCOS XL are supported
with the minimum required software version. See
the following table.
If it is necessary to connect any other compres-
sor controller, or a compressor with electro-me-
chanical control, to the master, a device known as
a compressor module (STD) can be installed into
the slave (see chapter "Installing the compressor
module (STD)"). This compressor module controls
the on-load/off-load switching of the compressor,
monitors its status such as "Ready" and "On-Load"
and is connected to the master via a serial link.
Supported slave compressor controllers and
required software versions
The following compressor controllers are sup-
ported and must have a software version number
not less than one of those stated below:
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