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.
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