My voltage and current measurements on the power monitor are correct, but power integration either doesn't occur, or the values are small. How do I check whether the measured values are abnormal?

Check the active power. If the active power turns negative or extremely small, check the items below. The active power is negative when the power is regenerating.

Active power check items

Items to check

  1. Is the CT attachment orientation correct?
  2. Is a CT connected to the R and T phases?
  3. Is the R phase CT connected to 1S and 1L, and is the T phase CT connected to 3S and SL? Also check the polarity (k, l) on the CT secondary side.
  4. Are R, S, and T wired to P1, P2, and P3?

Check the wiring and attachment for other phase and wiring schemes as well.

Related Products & Solutions