VFD FOR PULVERISOR APPLICATION
Posted 19 June 2005 - 05:34 AM
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Posted 19 June 2005 - 06:45 PM
If the machine is drawing more current than it was when across the line, there are several possible causes.
1. Is the speed the same. If the speed is a little higher, the load wil be higher and so will the current.
2. is the voltage set up correctly. If the voltage profile is set up incorrectly, the voltage could be low and this would increase the current. Check the output voltage setting in the drive, and check voltage profile. You need to have a linear profile, not a square law.
3. How and where are you making the measurement? You need to use an averaging meter, not a peak reading. This means either a moving pointer type meter, or a true RMS digital. A standard digital will often tend to read high.
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