Teracom TCG120, Руководство пользователя

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TCG120 _R1.1 - March 2015 Page 7
“Star” topology can be used only as a last resort for up to 4 sensors and total cable length up to 10
meters:
There are many parameters which determine the maximum length of the wires - type of cable, the
number of sensors, ambient electromagnetic noise and sensor network topology.
It is strongly recommended to use only UTP/FTP cables and keep total cable length up to 60 m.
Although functionality has been achieved in longer distance, we cannot guarantee error-free operation
over mentioned wiring length.
We guarantee proper operation only with Teracom 1-Wire sensors.
6.2.5. Relay connection
The relay contacts are internally connected directly to the terminal connectors. For all relays
normally open, normally close and common contacts are available. For loads with higher switchable
current/voltage than specified, an external relay should be used.
When mechanical relays switch inductive loads such as motors, transformers, relays, etc., the
current will arc across the relay contacts each time the contacts open. Over time, this cause wears on
the relay contacts which shorten their life. When switching an inductive load, it is recommended that
relay contact protection devices are used.