Which type of analog signal can be used to not only control the speed of a motor, but also the direction of rotation of the motor?

Master the Motor Controls Level 3 Test. Engage with flashcards and detailed multiple-choice questions, complete with hints and thorough explanations. Prepare effectively for your exam!

Multiple Choice

Which type of analog signal can be used to not only control the speed of a motor, but also the direction of rotation of the motor?

Explanation:
To control both speed and direction with a single analog signal, you need a bipolar signal where the polarity determines direction and the magnitude sets speed. A ±5 VDC input provides positive values for forward rotation and negative values for reverse, with larger magnitudes driving the motor faster. The other options are unipolar (only positive values), so they can set speed but cannot convey direction on a single line without additional signaling or wiring. A current loop like 4-20 mA is also typically unipolar and would require extra circuitry or a separate direction control. Thus, ±5 VDC best fits the need for encoding both speed and direction in one signal.

To control both speed and direction with a single analog signal, you need a bipolar signal where the polarity determines direction and the magnitude sets speed. A ±5 VDC input provides positive values for forward rotation and negative values for reverse, with larger magnitudes driving the motor faster. The other options are unipolar (only positive values), so they can set speed but cannot convey direction on a single line without additional signaling or wiring. A current loop like 4-20 mA is also typically unipolar and would require extra circuitry or a separate direction control. Thus, ±5 VDC best fits the need for encoding both speed and direction in one signal.

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