I would check with the drive manufacture for phase converter operation. In most cases there is a single phase control transformer inside the drive that supplies the drive logic circuits. It is desirable to have these two lines hooked to the original L1 and L2 that is 180* out of phase (Not the sythetic L3 which bounces somewhere in between.). I take it that you have your step-up transformer, 240V to 480V, on the output of your phase converter (This could add another dimension to your sythetic L3.).
X always = 25 now that is strange! Does the CamSoft LOG.FIL show you anything?
Darek |