ABB UFC912A101 3BHE039426R0101 Output logic module

Thermostats control and monitor thermal processes. Surface-mounting thermostats in the ATH-SW series consist of one or two separate measuring and switching systems. The instruments can be supplied as temperature monitors TW, safety temperature monitors STW (STB) and safety temperature limiters STB. In fault condition, the STB sets the system being monitored to a safe operational state. Surface-mounting thermostats operate on the principle of liquid expansion, with a microswitch serving as the electrical switching device.

Switching action 

Temperature monitor TW When the temperature at the probe exceeds the setpoint, the microswitch is operated via the transmission mechanism and the circuit is opened or closed. When the temperature drops below the setpoint (by the amount of the switching differential), the microswitch returns to its initial position. Lock-out facility on the safety temperature limiter STB When the temperature at the probe exceeds the set limit, the circuit is opened and the microswitch is locked out mechanically. After the temperature has dropped below the critical temperature by about 10 % of the scale span (approx. 15% for limit setting > +350°C), the microswitch can be reset manually.

Common problem

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