What DC control voltage is used to control the speed of the motor connected to the VFD?

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

What DC control voltage is used to control the speed of the motor connected to the VFD?

Explanation:
The speed reference for most VFDs is a low-level analog input, specifically a 0–10 V DC signal. The drive converts that voltage into a frequency to control the motor, so higher voltage means higher speed and 0 V means stop. This range is popular because it gives good resolution and is widely compatible with PLCs and control signals. Among the options, 10 VDC matches this standard as the maximum speed reference. Other voltages shown are not the typical speed-reference range for most drives, since 24 V is usually a logic or supply voltage and 5 V or 12 V aren’t the standard full-range speed references.

The speed reference for most VFDs is a low-level analog input, specifically a 0–10 V DC signal. The drive converts that voltage into a frequency to control the motor, so higher voltage means higher speed and 0 V means stop. This range is popular because it gives good resolution and is widely compatible with PLCs and control signals. Among the options, 10 VDC matches this standard as the maximum speed reference. Other voltages shown are not the typical speed-reference range for most drives, since 24 V is usually a logic or supply voltage and 5 V or 12 V aren’t the standard full-range speed references.

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