How can the input current to a Variable Speed Drive be less than the output current?
Voltage and current are inversly proportional in an electrical circuit when power (watts) remains the same. It is possible for the output current of a drive to be higher than the input current to the drive if the output voltage is lower than the input voltage.
If the input voltage is 480V at 10 amps, the output current could be 20 amps at 240V. The drive is able to manipulate the output voltage up or down as needed to maintain power on the motor at any given speed. At times this will cause the drive to indicate output current higher than input current. This is a normal function of the drive. Note that Power in watts is equal to voltage multiplied by current, so 480V X10A =4800W. 240VX20A is also equal to 4800W. The power in watts will remain the same.
If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:
If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us at drive.products.support@se.com to create a case with our Technical Support Team.
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Released for: Schneider Electric USA
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