Teracom TCG120-4, Руководство пользователя

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TCG120-4_R1.3 – May 2022 Page 8
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.
6. LED indicators
LED indicators show the status of the module:
•
REL1 – REL2 (green) – the LED is ON when the corresponding relay is activated (the NO
contact is connected to COM);
•
SIG (red) – indicates the status of the device together with STA
•
STA (yellow) – indicates the status of the device together with SIG.
The following states are displayed:
•
Module initialization – after power-on SIG and STA turn ON for a second, after this turn
OFF for another second.
•
Searching for a network – after initialization, SIG is OFF, STA flashes (flash period of
200ms)
•
Connected to a network – after a successful connection to a mobile network, STA shows
the type of connection, while SIG shows the signal strength.
STA flashes ones for 200ms in a period of 2s – there is GSM connection only;