25030

Check Mechanical Binding

Navigate to Diagnostics > Drive Status and verify actual current vs. commanded current. Manually check axis movement with drive disabled via HMI Service > Drive > Manual Operation.

Ensure machine is in safe state and emergency stop is accessible before manual movement

Verify Load Parameters

Check MD32910 (rated motor current) and MD32920 (maximum motor current) settings against actual load requirements in Parameters > Machine Data > Drives.

Compare current consumption during normal operation - should be 20-40% of rated current for typical positioning moves

Inspect Coupling and Transmission

Examine mechanical coupling between motor and load for wear, backlash, or failure. Check belt tension, gear mesh, and ballscrew condition.

Listen for unusual noise during movement - grinding indicates mechanical wear

Check Encoder Signals

Access Diagnostics > Drive > Encoder and monitor encoder pulses during manual jog. Verify MD31020 (encoder resolution) matches physical encoder specifications.

Encoder signals should show clean square waves - distorted signals indicate cable or encoder issues

Verify Encoder Power Supply

Measure encoder supply voltage at drive terminals (typically 5V or 24V). Check MD31040 (encoder supply voltage) parameter setting matches encoder requirements.

Use appropriate meter settings - encoder circuits are sensitive to voltage spikes

Test Encoder Cable Continuity

Perform continuity test on encoder cable from motor to drive. Check for proper shielding connection and verify cable routing away from power cables.

Intermittent encoder faults often occur at cable flex points - check these areas carefully

Verify Drive Output Stages

Check drive LED status indicators and access Diagnostics > Drive > Power Stage Status. Monitor actual current output vs. commanded current in real-time display.

Healthy drives show current following within 5-10% of commanded values during motion

Test Motor Winding Resistance

Disconnect motor cables and measure winding resistance between phases. Compare readings to motor nameplate specifications and check for balance between phases.

Ensure drive is powered down and locked out before disconnecting motor cables

Check DC Bus Voltage

Monitor DC bus voltage in Diagnostics > Drive > DC Link. Verify voltage stability and compare to MD32600 (DC link voltage nominal) parameter setting.

DC bus voltage should remain stable within ±10% during acceleration - large drops indicate power supply issues

Verify Motor Parameter Settings

Navigate to Parameters > Machine Data > Drives and confirm MD32910 (rated current), MD32950 (motor rated speed), and MD32960 (motor rated torque) match motor nameplate.

Use Siemens STARTER software to auto-configure parameters from motor database when available

Check Position Loop Configuration

Verify MD32200 (position loop gain) and MD32410 (maximum following error) settings are appropriate for the mechanical system inertia and required positioning accuracy.

Higher inertia systems require lower position loop gains to prevent instability

Review Monitoring Parameters

Check MD32411 (following error monitoring time) and MD32412 (following error warning threshold) to ensure stall detection timing is appropriate for application.

Increase monitoring time for high-inertia loads that require longer acceleration periods