Power Supplies
Description
The FLA for each of the 5 HP motors would be used in the calculations, but the locked rotor amps (LRA) for the 10 HP would have to be taken into account. The LRA is the amount of current drawn by a motor at startup.
The EMI filter contains high frequency common mode line to ground bypass capacitors that short circuit any high frequency ground noise current returning on the output shielded cable, right back to the vector VFDs R,S,& T terminals. In a simplified explanation, the EMI filter low impedance bypass capacitors return most of the noise current to the vector VFD drive input from the PE ground grid. Also, the EMI filter CM and phase inductors are high impedance blockers to insure that little high frequency noise current is allowed to flow in the plant power lines or ground grid that is ahead of the EMI filter.
Because the 10 HP motor wouldn& acute;t be accelerated from zero frequency and voltage to its running condition, it would look at the vector VFD as a fixed voltage/frequency line starter and would require its full LRA rating to quickly accelerate to the vector VFD& acute;s output frequency.
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Variable frequency drive
VFD drives
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Shenzhen, Guangdong
China, 518000
Tel: 0086-139-28480241
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