What causes KUKA Robot alarm KRC0125?

Mechanical binding, collision, or increased friction in axis causing sustained high current draw as motor fights against external load or obstruction. Incorrect motor parameters configured in WorkVisual such as wrong winding resistance, thermal time constant, or current limits not matching actual motor nameplate specifications. Sustained operation near or at maximum payload capacity with insufficient cycle time for motor cooling between motion segments leading to cumulative thermal buildup. Degraded motor bearings or gearbox issues increasing mechanical resistance and forcing higher motor currents to maintain programmed velocities and accelerations. Repetitive axis jogging or manual mode operation at low speeds causing continuous current flow without the cooling benefit of normal velocity operation and air circulation.

How do I fix KUKA Robot alarm KRC0125?

1. Step 1: Allow 10-15 minute cool-down period, then manually jog affected axis slowly through full range of motion to detect mechanical resistance, binding, unusual noise, or rough spots 2. Step 2: Access WorkVisual project and verify motor parameter configuration for the affected axis in Drive Configuration, cross-reference values against motor nameplate and KUKA motor database for correct thermal model 3. Step 3: Review program and identify motion segments where alarm occurs, check for excessive payload, rapid direction changes, or continuous partial-axis operation without full-speed cooling cycles 4. Step 4: Inspect mechanical components on affected axis including bearings, gearbox, and external dress-out packages for binding, cable wrapping, or collision damage that increases mechanical load 5. Step 5: Monitor real-time axis current values through Service Axis Monitoring display during program execution, compare actual current to nominal values for similar motion, identify abnormal current spikes or sustained high levels 6. Step 6: If mechanical inspection reveals no issues and parameters are correct, perform motor insulation resistance test (megger test) to rule out winding degradation, replace motor if insulation breakdown detected, or escalate to KUKA for drive amplifier thermal model calibration

KUKA Robot codes

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KUKA Robot Controller

System · Intermediate

Alarm KRC0125

KUKA Robot KRC0125 - i2t Monitoring - Current Limit Exceeded

The i-squared-t thermal overload protection has detected that the accumulated thermal stress on one or more motor windings or drive stages has exceeded safe limits. This algorithm integrates current over time to calculate heat buildup in the motor and drive, triggering the alarm when the thermal model predicts potential damage. Motion is halted until the calculated thermal load decreases to safe levels through cooling.

KUKA RobotSystemIntermediate

KRC0125

KUKA Robot KRC0125 - i2t Monitoring - Current Limit Exceeded

i2t Monitoring - Current Limit Exceeded

Common Causes

Mechanical binding, collision, or increased friction in axis causing sustained high current draw as motor fights against external load or obstruction
Incorrect motor parameters configured in WorkVisual such as wrong winding resistance, thermal time constant, or current limits not matching actual motor nameplate specifications
Sustained operation near or at maximum payload capacity with insufficient cycle time for motor cooling between motion segments leading to cumulative thermal buildup
Degraded motor bearings or gearbox issues increasing mechanical resistance and forcing higher motor currents to maintain programmed velocities and accelerations
Repetitive axis jogging or manual mode operation at low speeds causing continuous current flow without the cooling benefit of normal velocity operation and air circulation

Troubleshooting Steps

1Step 1: Allow 10-15 minute cool-down period, then manually jog affected axis slowly through full range of motion to detect mechanical resistance, binding, unusual noise, or rough spots
2Step 2: Access WorkVisual project and verify motor parameter configuration for the affected axis in Drive Configuration, cross-reference values against motor nameplate and KUKA motor database for correct thermal model
3Step 3: Review program and identify motion segments where alarm occurs, check for excessive payload, rapid direction changes, or continuous partial-axis operation without full-speed cooling cycles
4Step 4: Inspect mechanical components on affected axis including bearings, gearbox, and external dress-out packages for binding, cable wrapping, or collision damage that increases mechanical load
5Step 5: Monitor real-time axis current values through Service Axis Monitoring display during program execution, compare actual current to nominal values for similar motion, identify abnormal current spikes or sustained high levels
6Step 6: If mechanical inspection reveals no issues and parameters are correct, perform motor insulation resistance test (megger test) to rule out winding degradation, replace motor if insulation breakdown detected, or escalate to KUKA for drive amplifier thermal model calibration

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