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I'll check with a scope. I thought the 3 phase was AC so just used my Fluke true RMS meter on AC and 129 volts is what I got. i'll make a voltage divider and see what the scope says. or is there just a conversion factor to apply when using an RMS AC meter to measure this sort of pulsed DC? i don't want to burn up my scope. a ten to one voltage divider should do it but ???

if i just had a manual specifically for the inverter it would be best but there does not seem to be one. i will call automation tech on monday maybe they have one. on the nameplate it has a model number that is not listed in the regular manual and it says 110 volt single or 3 phase input and suggests that the output is 110 volt three phase but the listing online for this inverter in a package with a 220 volt motor says that the output is 220 volt three phase.

PD041 looks like it might be useful? the manual calls it "carrier frequency" and it ranges from 100 hz to 20khz? it is suggested that a compromise between electrical noise and power can be made with this setting. they caution about changing it is small increments. does a higher carrier frequency allow for more power? is the heating of the inverter or the motor or both that are of concern with higher frequencies?

?

Inverters or VFDs output a pulsed DC voltage. It would require an
oscilloscope to get an accurate voltage measurement, a normal voltmeter
or multimeter will not show an accurate voltage.

I do not know the model referred to here, but there are many VFDs that
will use 120v input and drive 220 volt motors.

ron ginger

On 3/15/2015 4:32 AM, mach1mach2cnc@... wrote:
> i set max voltage at 220 (or even higher) in the parameter setup but
> when i measure each phase it is only 129 volts.

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