Applicable Systems
MoviDrive

Symptoms

Motor stall. The motor has stalled during acceleration or during steady-state operation. The drive detectszero speed feedback while a speed command is active.

Possible Causes

  • Mechanical jam or seizure in the driven equipment
  • Motor torque insufficient for the applied load
  • Acceleration ramp time too short causing stall during startup
  • Brake not releasing properly, preventing motor rotation
  • Motor phase loss: one motor phase open circuit

Troubleshooting Steps

  1. Step 1: Check the equipment status and fault indicators to confirm the active fault code
    Fault indicator or HMI displays code F27 as active
  2. Step 2: Verify all electrical connections, wiring harnesses, and connector seating
    All connections secure, no corrosion, loose pins, or damaged wires
  3. Step 3: Check motor cable connections at drive output terminals for correct phase sequence and tightness
    Cables securely connected, phase sequence correct, no loose terminals
  4. Step 4: Measure motor winding insulation resistance with a megger (500V DC minimum)
    Insulation resistance above minimum value (typically > 1 Megaohm)
  5. Step 5: Verify drive parameter settings match motor nameplate data (current, voltage, power, RPM)
    All motor nameplate parameters correctly entered in drive
  6. Step 6: Inspect motor for mechanical overload, bearing seizure, or driven equipment jam
    Motor rotates freely, no mechanical binding or excessive load
  7. Step 7: Reset the fault after fixing the root cause: clear the fault via HMI or power-cycle
    Fault clears and drive resumes normal operation without recurrence

How to Reset

To reset: 1) Identify and fix the root cause described in the fault symptoms. 2) Press RESET on the HMI or controller, or power-cycle the equipment. 3) If the fault recurs, contact manufacturer service. Caution: Document the fault code and context before resetting.

Frequently Asked Questions

  • Q: What does fault code F27 mean on the SEW Eurodrive MoviDrive?

    Fault F27 on the SEW Eurodrive MoviDrive indicates: Motor stall. The motor has stalled during acceleration or during steady-state operation. The drive detects zero speed feedback while a speed command is active. Refer to the equipment manual and manufacturer support for specific troubleshooting steps.

  • Q: Can I continue operating the equipment with fault F27 active?

    No. The equipment has detected a fault condition and has taken protective action (typically stopping or derating). Continuing to operate without fixing the root cause may cause further damage. Always investigate and fix the fault before resuming operation.

Related SEW Eurodrive Fault Codes

Source: SEW Eurodrive MoviDrive MDX61A Operating Instructions, SEW-Eurodrive Documentation

Category: PLC & VFD