Hi Jon,
So tie say the 48v side to ground to create the neutral? I attached the
drawing of what I have so far on the VFD side.
Happy New year to you and I hope you stayed dry during the recent
monsoon we got.
JT
On 12/31/2015 7:16 PM, Jon Elson wrote:
On 12/31/2015 03:24 PM, John Thornton wrote:
I went and checked the control transformer and one side is 48v to ground
and the other side is 79v to ground. I guess I was confused by that.
Do you have a ground connected to that winding? If not,
then the capacitance of that winding to other windings and
the core will set what AC potential you get at each end.
I'm guessing you have a totally floating secondary, and this
adds up to 127 VAC, which sounds right for a nominal 120 V
output. You can tie one end of the winding to frame ground,
establishing a new neutral in the cabinet for the computer,
etc. loads.
Jon
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