BOGE FOCUS compressor control for piston compressors
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FOCUS
1.6
Functions
Base load switch
control with additional
compressors
The control contains a master control function for a total of up to four compres-
sors. This means that a maximum of three additional compressor controls can
be connected – either by means of the integrated or optional serial RS485 in-
terface (Modbus RTU) or also by means of optional relay modules (one relay
module per compressor) to the master parameterized FOCUS control.
The serial connection is only suitable for compressors with FOCUS or RATIO
control.
The relay modules are suited for machines equipped with BASIC control, all
other BOGE compressor controls or controls with single-pole control pressure
switch using two terminals only.
As regards any other compressor makes (e.g. with electronic controls) BOGE
is unable to warrant proper connection.
No star shaped connection must be used for the serial RS485 module but
make sure to use separate connections from compressor to compressor.
All relay modules must be installed in the switch cabinet of the master com-
pressor.
A FOCUS control is changed into a master unit by setting its parameter 70
(number of compressors) at any value above 1. This means at the same time
that for any other FOCUS control equipped (slave) compressors this number
must be set at 1.
Transmitter for system pressure
An additional module (rotary switch in position 2) for rail mounting with analogue
input (+ = 6, signal = 7) will be available as of version 1.18 for integration of a
system pressure transmitter using two-wire technology (output ‚4 … 20 mA')
and a shielded cable; it is for example to be pneumatically connected to a col-
lection point such as a buffer tank. The module is snapped on directly next to
the main circuit board.
As of version 1.18 parameters 075...078 are used as pressure setpoints for
both NLS pressure ranges.
Addresses and output releases
The addresses and output releases of the compressors equipped with serial
connection (Modbus RTU) or relay modules have to be set according to the
following table:
* As regards shut-off or reduction (on pressure band 2) by means of integrated real time clock
please see chapter Unplanned compressed air requirement
The base load switching control of FOCUS can be operated either at cyclic
intervals or by means of an integrated real time switch clock – also see chapter
"Switch Clock".
Compressor
Address
Relay module rotary switch
Output release
1 (Master)
0
n / a
Internal *
2
2
2
External
3
3
3
External
4
4
4
External
