Cause : Over slip warning comes when the motor speed has deviated from the programmed speed limit by a certain amount for a specific duration. This fault indicate the motor speed has reached the programmed speed limit set in the drive.

The oSL error code on your Delta MS300 drive indicates a "Speed Limit Reached" warning. This means the motor speed has reached the programmed speed limit set in the drive.

1. When Pr.07-31=0 and when the drive outputs at constant speed, and F>H or F<H no longer exceeds the Pr.07-29 level, the oSL warning automatically clears.
2. Check the motor parameter.
3. Check the parameter settings for oSL protection.