10.2
Activating/deactivating thermistor protection
Activation
The thermistor protection function is disabled in the delivery state. If the device detects a
connected thermistor when switched on, the thermistor is automatically activated. If the
thermistor is removed, the thermistor function must also be deactivated by the user, otherwise,
a diagnostics message is generated. You can find more information on the faults in Chapter
"Fault codes (only in the case of non-acknowledgeable faults) (Page 104)".
Deactivation
If you press and hold down the TEST/RESET button while switching on the control voltage (L
+ / L-), the THERMISTOR LED lights up. If you now release the button within 3 s, the thermistor
function is deactivated. This is indicated by flashing of the THERMISTOR LED at 7 s intervals.
Note
Danger of false short-circuit detection!
To guarantee sure functioning of the short-circuit detection in the thermistor circuit, the line
resistance must not exceed 10 Ω in the case of a short-circuited thermistor.
Note
The "Thermistor - monitoring" parameter can be read out via IO‑Link for documentation
purposes, for example. This parameter cannot be set or modified via IO‑Link.
Operation
10.2 Activating/deactivating thermistor protection
SIRIUS 3RB24 electronic overload relay for IO-Link
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Equipment Manual, 07/2022, NEB969165602000/RS-AA/003
