Unit was received with a typical problem. The motor speed was not consistent and the contactors were chattering. Troubleshooting revealed that both contactors were not operating properly. Further inspection revealed that the internal contacts were not closing completely , as they should. It was clear that the environment played a significant role in the failure of these components. The unit was covered with a fine dust that had penetrated the contacts and prevented them from closing properly. Cleaning the internal contacts repaired both contactors. The rest of the unit was cleaned, as well. The unit was then tested under a motor load and ran perfectly in both directions.
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