Speed Deviation

What does dEv mean?

This fault occurs when the difference between the motor's detected speed and its commanded speed exceeds a set detection level (F1-10) for a specified duration (F1-11). Common causes include excessive load, improperly short acceleration/deceleration times, a mechanically locked-up load, or an engaged holding brake. This indicates the motor is not achieving its commanded speed, potentially leading to process delays or equipment damage if the load is stalled.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Increase the acceleration and deceleration times by adjusting parameters C1-01 to C1-08.

2. 4

   Adjust the speed deviation detection level (F1-10) and delay time (F1-11) if they are set too sensitively for the application.