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How does 3UN2100-0AF7 work,. Is it based on temperature. We did simulate to remove from Motor for NDE Bearing temperature & connected an instrument to simulate temperature rise by changing resistance. However this test did not work out. The Thermistor protection relay operates once the loop is disconnected. i.e once the device or Thermistor sensor is disconnected the device operates. Please let me know whether this Testing is OK. As per manula first temperature will go down & thereafter increase. At some point will it give open circuit.
Thanks
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The 3UN2100-0AF7 Thermistor Protection Relay does operate based on a change in thermistor resistance, which correlates to temperature. However, it's designed to detect open circuits or significant deviations in the thermistor's resistance, not necessarily a gradual temperature rise.
Your testing method – simulating temperature rise with resistance – is not the correct approach. The relay is configured to trip when the thermistor loop is broken (disconnected) or the resistance goes beyond pre-defined limits.
The manual's description of temperature "going down then up" refers to the thermistor's resistance characteristic as temperature changes, not the relay's operational sequence. The relay primarily monitors for a loss of signal (open circuit) from the thermistor.
Your observation – the relay operating on disconnection – is the expected behavior. This is a safety feature to indicate a failed thermistor or connection.
For detailed information and correct testing procedures, please refer to the 3UN2100-0AF7 manual on SiePortal.
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