Phase Vsd
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 Eaton Compressor 50HP 3 Phase VSD Rotary Screw Package  US $25,042.00
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 Brand New 50HP 3 Phase VSD Rotary Screw Package US $25,042.00
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 Brand New 40HP 3 Phase VSD Rotary Screw Package US $21,815.00
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 Industrial 40HP 3 Phase VSD Rotary Screw Package US $21,815.00
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 Eaton Compressor Brand New 60HP 3 Phase VSD Rotary Screw US $20,818.00
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 Industrial 60HP 3 Phase VSD Rotary Screw US $20,818.00
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 Polar Air 60HP 3 Phase VSD Rotary Screw US $20,818.00
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 Brand New 50HP 3 Phase VSD Rotary Screw US $19,129.00
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 Polar Air 50HP 3 Phase VSD Rotary Screw US $19,129.00
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 Industrial 50HP 3 Phase VSD Rotary Screw US $19,129.00
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 Brand New 30HP 3 Phase VSD Rotary Screw Package US $16,401.00
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 Polar Air 30HP 3 Phase VSD Rotary Screw Package US $16,401.00
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 Industrial 30HP 3 Phase VSD Rotary Screw Package US $16,401.00
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 Brand New 40HP 3 Phase VSD Rotary Screw US $16,176.00
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 Industrial 40HP 3 Phase VSD Rotary Screw US $16,176.00
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 Polar Air 40HP 3 Phase VSD Rotary Screw US $16,176.00
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 Brand New 25HP 3 Phase VSD Rotary Screw Package US $15,758.00
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 Eaton Compressor 25HP 3 Phase VSD Rotary Screw Package US $15,758.00
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 Polar Air 25HP 3 Phase VSD Rotary Screw Package US $15,758.00
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 Industrial 25HP 3 Phase VSD Rotary Screw Package US $15,758.00
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 Brand New 20HP 3 Phase VSD Rotary Screw Package US $12,320.00
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 Eaton Compressor Brand New 20HP 3 Phase VSD Rotary Screw Package US $12,320.00
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 Polar Air 20HP 3 Phase VSD Rotary Screw Package US $12,320.00
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 Industrial 20HP 3 Phase VSD Rotary Screw Package US $12,320.00
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 Brand New Eaton Compressor 30HP 3 Phase VSD Rotary Screw US $12,238.00
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 Eaton Compressor 30HP 3 Phase VSD Rotary Screw US $12,238.00
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 Brand New 30HP 3 Phase VSD Rotary Screw US $12,238.00
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 Polar Air 30HP 3 Phase VSD Rotary Screw US $12,238.00
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 Industrial 30HP 3 Phase VSD Rotary Screw US $12,238.00
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 Eaton Compressor 25HP 3 Phase VSD Rotary Screw US $11,743.00
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 Brand New 25HP 3 Phase VSD Rotary Screw US $11,743.00
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 Industrial 25HP 3 Phase VSD Rotary Screw US $11,743.00
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 Polar Air 25HP 3 Phase VSD Rotary Screw US $11,743.00
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 Brand New 15HP 3 Phase VSD Rotary Screw Package US $11,165.00
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 Polar Air 15HP 3 Phase VSD Rotary Screw Package US $11,165.00
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 Eaton Compressor 15HP 3 Phase VSD Rotary Screw Package US $11,165.00
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 Industrial 15HP 3 Phase VSD Rotary Screw Package US $11,165.00
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 Industrial 10HP 3 Phase VSD Rotary Screw Package US $9,515.00
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 Brand New 10HP 3 Phase VSD Rotary Screw Package US $9,515.00
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 Polar Air 10HP 3 Phase VSD Rotary Screw Package US $9,515.00
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 Eaton Compressor 10HP 3 Phase VSD Rotary Screw Package US $9,515.00
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 Industrial 75HP 3 Phase VSD Package US $8,553.00
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 Polar Air 75HP 3 Phase VSD Package US $8,553.00
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 Brand New 75HP 3 Phase VSD Package US $8,553.00
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 Brand New 20HP 3 Phase VSD Rotary Screw US $8,553.00
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 Polar Air 20HP 3 Phase VSD Rotary Screw US $8,553.00
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 Industrial 20HP 3 Phase VSD Rotary Screw US $8,553.00
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 Eaton Compressor 20HP 3 Phase VSD Rotary Screw US $8,553.00
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 Eaton Compressor 75HP 3 Phase VSD Package US $8,553.00
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 Brand New Eaton Compressor 15HP 3 Phase VSD Rotary Screw US $8,085.00
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 Eaton Compressor 15HP 3 Phase VSD Rotary Screw US $8,085.00
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 Eaton Compressor Polar Air 15HP 3 Phase VSD Rotary Screw US $8,085.00
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 Eaton Compressor Industrial 15HP 3 Phase VSD Rotary Screw US $8,085.00
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 Polar Air 10HP 3 Phase VSD Rotary Screw US $7,479.00
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 Eaton Compressor Brand New 10HP 3 Phase VSD Rotary Screw US $7,479.00
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 Eaton Compressor 10HP 3 Phase VSD Rotary Screw US $7,479.00
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 Industrial 10HP 3 Phase VSD Rotary Screw US $7,479.00
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 Eaton Compressor Industrial 75HP 3 Phase VSD Rotary Screw US $7,029.00
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 Polar Air 75HP 3 Phase VSD Rotary Screw US $7,029.00
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 Eaton Compressor Brand New 75HP 3 Phase VSD Rotary Screw US $7,029.00
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 Eaton Compressor 75HP 3 Phase VSD Rotary Screw US $7,029.00
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How come sometime one of 3 phase supply does not produce amp when running certain speed of VSD?
Situation: I have 5 unit SIEMEN VSD, all the time running 3 unit VSD, each of the incoming ampere carries R=33A, Y=35A, B=41A to control pressure A, but when running 4 unit VSD, you will notice 2 or 3 out of 4 unit one of the phase carries 0A (R=40A, Y=42A, B=0A) to control pressure A. However output secondary all carries balance load so no harm to the motor. Question is why this thing able happen? Is it due to load distribution? Is it due to voltage fluctuation affect the firing of power electronic component? Is it due to harmonic voltage high incure unstability of firing of power electronic component?
Most variable frequency drives (VFD) have just a passive 3-phase rectifier in the input section. Each phase of the rectifier conducts for only a short time when the voltage is near the peak of the sine wave. The input current is often imbalanced due to slight voltage imbalance and/or differences in supply line phase impedances. When the VFD is lightly loaded, the current imbalance is most noticeable. However, one phase current dropping completely dropping to zero would indicate a serious supply voltage imbalance, a bad connection or a bad circuit breaker or contactor somewhere in the supply wiring.
If the VFD has an active input section such as a controlled rectifier, the problem could be due to a problem with firing.
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