Overcurrent or Short Circuit
The servo drive has detected motor current exceeding the programmed overcurrent threshold, typically 150-200% of rated motor current, or instantaneous current above the hardware protection limit usually set at 300% of drive rating. This protection activates within microseconds to prevent drive output stage damage and can result from mechanical overload, electrical faults, or improper tuning parameters.
Error Code
568
Severity
Fault
Equipment
Servo Motor
Manufacturer
Schneider Electric
Drive fault display shows 'OC' or 'OVERCURRENT' with error code F008 and red status LED
Motor exhibits jerky motion or stalling under normal load conditions before fault activation
Current measurement at motor terminals exceeds 150% of motor nameplate rating during fault occurrence
Drive cooling fans operate at maximum speed due to elevated heat sink temperature above 70°C
Audible clicking or buzzing from drive during fault condition before protection shutdown
Oscilloscope shows current spikes exceeding 10A peak on 5A rated motor system during acceleration
Mechanical binding or seizure in driven machinery causing excessive torque demand above motor rating
Servo tuning parameters set too aggressively with velocity gain above 2000 Hz or position gain above 100 rad/s
Motor encoder feedback failure providing incorrect position information causing runaway current condition
Drive output stage component degradation with increased switching losses or thermal shutdown cycling
Motor cable length exceeding manufacturer specifications causing high frequency resonance and current amplification
Incorrect motor parameter configuration in drive setup with wrong motor resistance or inductance values
Implement lockout/tagout safety procedures and verify complete electrical isolation before beginning diagnostic work
Disconnect motor from mechanical load and test for free rotation by hand - investigate any binding or resistance
Review servo tuning parameters and reduce velocity gain by 50% and position gain by 30% as starting point
Test encoder signals using oscilloscope - A/B channels should show clean square waves with 90-degree phase shift
Measure motor cable length and verify within drive specifications - typically maximum 50 meters for standard applications
Verify motor parameter settings match motor nameplate data including resistance, inductance, and torque constant values
Perform current signature analysis during slow jog operation to identify mechanical resonances or electrical anomalies before returning to service
Safety First: Always isolate power and follow LOTO (Lockout/Tagout) procedures before working on electrical components. If unsure, contact a certified repair technician.
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