Siemens SIRIUS 3RN2 Manual page 49

Performing the device self-test/RESET
Device self-test
A device self-test is performed when the supply voltage is applied, or when the test function
is triggered, or cyclically during operation. The starting time is approx. 0.6 s.
The self-test comprises the following actions:
● Internal memory test
● Testing of the sensor circuit for tripping
When the supply voltage is applied, an LED test is additionally performed. The test involves
all LEDs lighting up for 2 s.
If the self-test finds an error, the unit shuts down automatically, i.e. all LEDs switched off and
output relays opened.
Test function
When not tripped, you can call the test function by pressing the blue TEST/RESET button for
longer than 2 s. This simulates tripping the unit due to overtemperature. The test performs
an internal device self-test and ensures the function of the display LEDs and the output
relay, and All LEDs light up. If Auto RESET is activated, the test function is automatically
reset.
After you have triggered the test function, you have to reset the thermistor motor protection
relay separately with manual RESET selected.
Note
Switching on
During switch-on (application of a voltage), you must not press the TEST/RESET button.
In this time (starting time), the thermistor motor protection relay checks whether the
TEST/RESET button is short-circuited.
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001
Functions
49