DK-40 USER MANUAL V2.6 (02.08.2011)
K13D01-E - 43 -
11. MULTIPLE CONTROLLER OPERATION
The multiple controller operation is designed for installations where more than one
compressor have to operate in parallel.
The multiple controller operation allows energy efficiency by running only the
necessary number of compressors in case of low air consumption. It performs equal aging
of compressors as well.
A maximum of 8 compressors can operate in parallel.
The multiple compressor operation is performed through the serial port of the unit.
Controllers will communicate through a common
RS-485 bus
using
RS-485 converters
.
The multiple compressor operation is enabled by assigning the
P65 Modbus
Address = 1
to one of the controllers.
Following numbers
must be given to other
controllers in the same group. No gap is allowed.
If a gap exists, controllers coming after the gap will operate independently.
Operation:
1. If the communication between units is lost, then controllers will operate
independently.
2. The controller with the least engine hours will become the
master
and operate
following
P04-P05
parameters. Other compressors will run and stop following their
engine hours.
3. If any of the compressors has
P67 Master Change Period
less engine hours than
the master controller, then this one becomes the new master.
4. If an alarm occurs at the master controller, then another controller will become
master.
5. If the pressure falls below
P05
, the master will run immediately. Other compressors
will run with delays of
P66/8
.
6. If at the expiration of
P66
timer, the pressure is above
P05
but below
(P04+P05)/2
,
then compressors will run with
P66/4
delays.
7. When the pressure approaches
P04
, compressors will stop in their respective order
of run hours.