Cause : Summation current too high comes when the smoothed total of the phase currents (i1 + i2 + i3) is greater than 4 % of the maximum power unit current (r0209).

Possible causes:

- the DC link has a ground fault that results in a high summation current (r0069.6). The DC component in the line currents can damage/destroy the power unit, line reactor or line filter!
- the zero point calibration of the current measurement was not carried out (p3491, A06602).
- defective current measurement in the power unit.

- check the DC link for a low-ohmic or high-ohmic ground fault and if present, remove.
- increase the monitoring time of the current offset measurement (p3491).
- replace the power unit if necessary.