8.2
Switch for
connection
The Master/Slave connection of more than two units requires the use of an industrial grade switch. Carel
supplies a switch (P/N: KITSE08000) that can connect a maximum of eight units (8 Ethernet ports). If
necessary, use several switches with a cascaded arrangement.
Technical specifications:
Number of ports 8
Installation DIN rail
Operating temperature -10 to 60°C (14 to 140°F)
Power supply
12/24/ 48 Vdc
18-30 Vac (47-63 Hz)
Current @ 24 Vdc 0.13 A
Protection IP30
Tab.8.a
8.3
Type of
installation
The Master/Slave system features one main unit (Master), which manages operation of the secondary units
(Slaves). The external signal or probe connections, depending on the set control type, are made to just
one of the humidifiers in the system. The unit that the signal is connected to will automatically be
identified as the Master. Consequently, the Master does not need to be especially configured.
Fig.8.d
As long as the Master unit is powered, the system will operate even if the Master itself has a malfunction
(e.g. alarms, production stopped, ...), as the controller on this unit will send all the necessary data to the
Slaves. Obviously, if system redundancy is not provided for, the amount of steam produced will be lower
than actual requirements. If the Master is completely switched off, the Master/Slave system cannot read
the signals/control probes. Therefore, it is recommended to connect at least two (or all) of the humidifiers
in the system to the external signal or to fit them with distinct probes.
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