240 Volt 3 Phase Issue

[Kevin L]

I have a 240 Volt 3 Phase motor that is controlled by an Altivar 18 controller.  When the controller is ramping up no problem, as soon as the controller hits 100% power, it shuts down with a OCF Error Code.  

http://stevenengineering.com/Tech_Support/PDFs/45A18UM.pdf#search='Altivar%2018'

Look at page 43.   I checked the 100 ohm 500 watt resistor and Its OK.  So testing the three legs at the motor for resistance I get U-V = 6.6 ohms, U-W = 6.6 ohms, V-W = 8.3 ohms.  My guess is legs U-W and U-V are shorted inside the motor somewhere.  Does this sound correct?  I also found the terminal box mounted to the motor had 1/2 inch of water in it.  Probably the first time it was removed in 5 years.  The U, V, W terminals were above the water line, but there were three terminals on the bottom with a buss bar connecting them that were touching the highly iron enriched water.

I appreciate any input.

Thank You

Kevin L

[MountainMan]

Guy at the place where I got my RV's generator fixed said the most common problem they have with generators next to the problem mine had (a dead voltage regulator) is soggy windings on the rotor.  They recommend running genny for a full hour every couple weeks to "cook" out the water.

I would suggest popping your motor in the oven at about 250 degrees F for a few of hours and then re-measure.

jp