We have a 250 HP, 480VAC Westinghouse Vectrol Soft Start motor starter that powers up with a Phase Loss Fault. Phase to Ground voltages of ~280VAC, are present on all three phases at the line terminals of the starter. In addition the phase to phase voltages are measured at ~485VAC. The information from the tag on this starter follows.
We are in urgent need of having this starter repaired or replaced with a like starter. We will consider any reasonable proposal from you in helping us achieve this goal.