All Of The VF Settings Plus A Glitch On One of The First Ever VVVF Inverters [Toshiba PTR-VVVF] 

#vvvf
In this video I show what a motor driven by a very old vvvf inverter sounds like on all of the different voltage/frequency ratio settings. Normally changing this ratio only changes the rate at which voltage increases as frequency increases. However on this particular inverter it also changes how the motor sounds.
For some background:
This is a Toshiba VF-Pack P VVVF-Inverter that uses power transistors. I believe it was made sometime before 1984 making it one of the first VVVF-Inverters made.
Motor Sound Rating: 10/10
Settings:
60Hz:
Setting 0 Low
Setting 1 Slightly Low
Setting 2 Standard Linear
Setting 3 Slightly High
Setting 4 High
Setting 5 Squared Low
Setting 6 Squared High
Setting 7 Automatic
50Hz:
Setting 8 Low
Setting 9 Slightly Low
Setting 10 Standard Linear
Setting 11 Slightly High
Setting 12 High
Setting 13 Squared Low
Setting 14 Squared High
Setting 15 Automatic
The Automatic mode changes the V/F curve based on motor load.
About the glitch I found:
By already having the motor running at full speed with setting 8 then changing it to setting 7 it increases the maximum output frequency without changing the V/F curve.

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