Refrigerator protection relay alarm. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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The operation of the domestic refrigerator protection relay occurs, as a rule, in the event of a malfunction of either the compressor. or the starting part of the relay itself. The response delay, due to the inertia of thermoelements, at a maximum current of 6 A can reach 2...2,5 s. Multiple overloads that occur due to unnoticed instability of the refrigerator operation can lead to damage to power elements - from internal wiring to the compressor. The simple device offered to the attention of readers gives a sound signal at each emergency opening of the power circuit.
The scheme of the device is shown in fig. 1. It is an AF generator on a unijunction transistor VT1, powered by a stabilized power supply unit R1VD1VD2C1, connected in parallel to the normally closed contacts K1.1 of the thermal relay (in this case, type P3). In case of their emergency opening, the generator is supplied with supply voltage, and it gives a continuous sound signal with a frequency of about 1,5 kHz.
A properly assembled device does not require adjustment. The tone of the audio signal can be changed by selecting the resistor R2. When connecting the signaling device to relay A1, it is required to remove the cover of the latter and, having made the necessary connections, pass the supply wires through the cut in the housing.
Author: D. Pankratiev, Tashkent, Uzbekistan
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