High Slip Braking Overload

What does oL7 mean?

This fault occurs when the load inertia is too large, an external force rotates the motor during deceleration, or something prevents proper deceleration on the load side. The output frequency remains constant longer than the n3-04 [HSB Overload Time] setting. This indicates that the drive's high slip braking mechanism is being overstressed, potentially leading to drive or motor damage if unresolved.

Complete Troubleshooting Guide

1. 1

   If High Slip Braking is not required, decrease deceleration times by adjusting parameters C1-02, C1-04, C1-06, and C1-08 to allow for smoother stops.

2. 2

   If HSB is in use, install a suitable braking resistor or verify the existing resistor is correctly sized and connected to dissipate energy during deceleration.

3. 3

   Increase the value set in n3-04 [HSB Overload Time] if the current setting is too short for the application's actual deceleration requirements.

4. 4

   Consider connecting a separate thermal overload relay to the motor for additional protection, and set n3-04 to its maximum value (1200 s) in the drive.

5. 5

   Perform a Fault Reset to clear the fault from the drive after implementing solutions.