What could indicate a malfunction in a reversing magnetic motor starter?

The indication of a malfunction in a reversing magnetic motor starter can best be recognized by the simultaneous activation of the forward and reverse coils. In a properly functioning reversing starter, these coils are designed to operate in a manner that prevents both directions from being activated at the same time. If both coils are energizing simultaneously, it can lead to a short circuit scenario or physical damage to the motor or starter due to opposing forces. This situation often endangers both equipment and safety, causing overheating or failure of components.

While other options present characteristics of normal operation or non-significant issues, they do not serve as indicators of malfunction. For instance, an uninterrupted power supply indicates that the circuit is receiving power, not necessarily that the motor starter is functioning properly. Consistent motor speed signifies that the motor is running smoothly without fluctuations, which is generally a sign of healthy operation. Reduced noise during operation could suggest normal functioning or quieting of the equipment, and is not indicative of a malfunction unless accompanied by performance issues. Thus, the true malfunction signal from a reversing magnetic motor starter is the unintended activation of both coils at once.