Troubleshooting 2340 fault. ACS800 drives 125hp motor. Cables tested and motor meggered. Inverters test good. Drive is set up 0-20ma. 1800 max speed. I can ramp up at 1ma steps without alarms or faults. If I ramp down at 1ma step, I receive a 3211 alarm (DC Bus Limit). At first, the alarm is quick, and then displays a little longer. After about the 3rd-4th time, the 2340 Short Circuit fault stops drive. If repeat the test, the 2340 appears at the first speed reduction. I can avoid any alarms or faults if I ramp down at .1 ma steps.
Cannot locate a service manual for this drive. I think there may be an issue with the main board responsible for processing current measurements.