Allen-Bradley Kinetix 5700 servo drive alarm FLT S07: MTR OVERLOAD FL (Motor Thermal Overload, factory limit)
Fault FLT S07 – MTR OVERLOAD FL on an Allen-Bradley Kinetix 5700 is Motor Thermal Overload (factory limit): the motor thermal model exceeded its factory-set thermal capacity limit.
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When it happens
- After running a demanding cycle for some time (thermal model accumulates)
- At constant speed with high friction or process load
- At standstill holding a vertical or unbalanced load
Likely causes and checks
1Motion profile too demanding for the motor
- Points to it
- Fault appears after a cycle-time reduction or speed increase.
- Check
- Modify the command profile to reduce speed or increase time, as Rockwell directs; compare RMS torque with the motor continuous rating.
2Mechanical load increased (friction, binding, brake drag)
- Points to it
- Torque at constant speed has risen over time.
- Check
- Trend torque at constant speed and inspect lubrication, alignment and brake release.
3Holding torque at standstill
- Points to it
- Vertical axis or counterbalance problem; fault without much motion.
- Check
- Check holding torque and the counterbalance.
Telling it apart
- FLT S07 is the factory limit; FLT S08 – MTR OVERLOAD UL trips at the user limit set in Motor Thermal Overload User Limit.
- FLT S13/S14 are the inverter (drive) thermal overload equivalents; FLT S05 is motor overtemperature from the motor’s own thermal data.
Relevant parameters
| Parameter | Name | Why it matters |
|---|---|---|
| Motor Thermal Overload User Limit | Axis attribute | Sets the user limit for FLT S08; S07 uses the factory limit. |
Evidence to collect
- Full LCD text and fault log time stamps
- Torque trend over a full cycle
- Motor catalog number and continuous torque rating
- Recent changes to the profile or mechanics
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