Stall Prevention Stop

What does E.OLT mean?

The FR-A800 inverter has tripped due to the activation of the stall prevention function, which has escalated to a stop condition. This occurs when the overcurrent condition persists despite stall prevention limiting, indicating that the motor or load is severely overloaded or there is a mechanical issue preventing the motor from following the command.

• Severe or sustained motor overload preventing the motor from reaching commanded speed.
• Mechanical binding or blockage of the driven equipment.
• Stall prevention operation level H500 (Pr.22) is set too high, preventing current limiting from occurring effectively before a trip.
• FR-A800 inverter output voltage is lowered during current control, but the load still demands excessive current.
• Incorrect motor parameters or motor type/capacity mismatch.

Click steps to track your progress.

1. 1

   Immediately investigate the mechanical load for binding, obstructions, or excessive inertia.

2. 2

   Verify that motor parameters in the FR-A800 inverter (e.g., rated current, base frequency) match the motor nameplate.

3. 3

   Adjust the stall prevention level H500 (Pr.22) to an appropriate value, ensuring it's not excessively high or low, as per the motor and application requirements.

4. 4

   Check the output voltage and current under load using the FR-A800 inverter's monitoring functions.

5. 5

   If the issue occurs at start, check starting conditions and ensure G002 (Pr.19) (Base frequency voltage) is set correctly (not '9999' for fixed voltage applications).