Speed Deviation Excess Detection

What does E.OSD mean?

The inverter output is shut off because the motor speed significantly deviated from the command value during Vector or PM sensorless vector control, preventing proper control. This usually occurs when Pr.285 Speed deviation excess detection frequency is active and can be caused by sudden load changes or incorrect parameter settings. Prolonged deviation can lead to unstable operation.

Complete Troubleshooting Guide

1. 1

   Adjust Pr.285 Speed deviation excess detection frequency and Pr.853 Speed deviation time to appropriate values for the application.

2. 2

   Investigate and mitigate any sudden load changes that might be occurring on the motor.

3. 3

   Verify and correct Pr.369 Number of encoder pulses if it does not match the actual encoder specifications.