Question:
What is the purpose of the integrated temperature sensor or temperature contact (TKO) on terminals T1 and T2 in mains, motor or sinusoidal filters?
Answer:
Since the filters mentioned above can be thermally destroyed if the operating conditions are not observed, e.g. ambient temperature, cable length, switching frequency, etc., they are equipped with an integrated temperature sensor (normally closed contact).
The connections of the temperature sensor are marked T1 and T2. For safety reasons, this is a normally closed contact (load capacity: 250V AC / 1.5A).
The NC contact should be integrated into the self-latching of the mains contactor responsible for feeding the inverter.
Otherwise, a corresponding fault message should at least be triggered at the inverter in order to thereby block the inverter and stop the energy flow.
Note: After the filter has cooled down, the temperature monitoring resets automatically, i.e. the contact closes again.
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