Question 363Electricity & Electronics - QMED
70% to passAs shown in the illustrated electronic overload relay circuit, what is the functional purpose of potentiometer "R2"? Illustration EL-0091
Ait is used to set the inverse-time function setting of the overload relay
Bit is used to set the overcurrent trip setting of the overload relay
Cit is used to protect the rectifier from thermal damage
Dit is used to set the instantaneous trip setting of the overload relay
AI Explanation
The correct answer is B) It is used to set the overcurrent trip setting of the overload relay. The potentiometer R2 in the illustrated electronic overload relay circuit is used to adjust the overcurrent trip setting of the relay. This allows the operator to set the threshold at which the relay will trigger and interrupt the circuit to protect the equipment from damage due to excessive current. The other answer choices are incorrect because: A) the inverse-time function is a separate setting, C) the rectifier is not part of the overload relay circuit, and D) the instantaneous trip setting is also a separate function from the overcurrent trip setting controlled by R2.
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