What should the DC bus measure on an ATV312H...N4?
Resolution:
The DC bus voltage on an ATV312H…N4 drive depends on the incoming AC supply voltage.
As a general rule, the DC bus voltage will be approximately equal to the peak value of the line supply voltage.
Example:
- If the line supply voltage is 480 VAC (RMS)
- The expected DC bus voltage is:
480 × 1.414 ≈ 678 VDC
This relationship applies because the DC bus reflects the rectified peak of the AC input voltage.
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