Kinetix 5700 FLT S07 MTR OVERLOAD FL: what to check first?

Question

I'm getting a FLT S07 MTR OVERLOAD FL fault on a Kinetix 5700 servo drive. It happens after the machine runs a demanding cycle for a while. What should I check first?

Top answer · Written by InduQT from the fault guide and manufacturer manuals cited below · Oct 28, 2026

The FLT S07 MTR OVERLOAD FL fault on an Allen-Bradley Kinetix 5700 servo drive indicates that the motor's thermal model has exceeded its factory-set thermal capacity limit. This fault often occurs after a demanding cycle, at constant speed with high friction, or when holding a vertical or unbalanced load. It's distinct from user-limit overloads (FLT S08) or drive thermal overloads (FLT S13/S14).

Likely causes and checks

1Motion profile too demanding for the motor

Points to it: The motor's thermal model exceeded its factory-set thermal capacity limit because the motion profile demands too much from the motor. This is often seen after a cycle-time reduction or speed increase.
Check: Modify the command profile to reduce speed or increase time, as Rockwell directs. Compare the RMS torque with the motor's continuous rating.

2Increased mechanical load

Points to it: Increased friction, binding, or brake drag can cause the motor's thermal model to exceed its factory limit. Torque at constant speed may have risen over time.
Check: Trend torque at constant speed and inspect lubrication, alignment, and brake release.

3Holding torque at standstill

Points to it: If the fault occurs without much motion, it could be due to excessive holding torque at standstill, possibly from a vertical axis or counterbalance problem.
Check: Check the holding torque and the counterbalance system.

Next check: After checking the motion profile, mechanical load, and holding torque, ensure the ambient temperature is not too high or that motor cooling is adequate, as high ambient temperatures can contribute to thermal overload.

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