Need Rotation meter for VFDs

[haze10]

Can anyone recommend a phase rotation meter that will work on PWM VFD outputs. My AEMC #PMR-1 meter seems to go nuts when I connect it. I was thinking one of the old fashion rotating motor type meters would work. Anyone solve this problem?

 

[jraef]

The old fashioned electromechanical rotation meters should work fine, I used them as demos to show instant reversal capabilities of VFDs years ago (before people readily accepted the concept). Here's one similar to what I had.

http://www.kilowattclassroom.com/EquipSPD.htm

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