Rexroth EFC Error Code E-1004

Rexroth PLC & VFD Major Drive

Model: EFC | Code: E-1004

Applicable Systems
EFC FEX FEI HNC

Symptoms

The drive trips. The error display shows E-1004, indicating motor overload. The drive's electronic thermal model has determined that the motor has exceeded its thermal capacity.

Possible Causes

  • Motor load exceeds rated capacity for an extended period
  • Motor cooling inadequate
  • Motor rated current parameter set incorrectly
  • Motor undersized for the application

Troubleshooting Steps

  1. Step 1: Check the motor load and verify it is within rated capacity
    Motor load is within the rated power and current
  2. Step 2: Inspect motor cooling system for blockages or fan failure
    Motor cooling is adequate and ventilation paths are clear
  3. Step 3: Verify the motor rated current parameter matches the nameplate
    Parameter matches the motor nameplate full load current
  4. Step 4: Measure motor current during operation
    Motor current is at or below rated full load amps

How to Reset

To reset: 1) Reduce the motor load or improve cooling. 2) Allow the motor to cool. 3) Verify motor parameters. 4) Clear the fault. Caution: Repeated thermal overload trips degrade motor insulation. Ensure the motor is correctly sized.

Frequently Asked Questions

  • Q: How does the drive calculate motor thermal overload?

    The drive uses the motor current measurement and the motor rated current parameter to calculate a thermal state using an I2t model. When the calculated temperature exceeds the trip threshold, the drive trips to protect the motor.

  • Q: What parameters do I need to set for motor thermal protection?

    Set the motor rated current (from the nameplate), motor rated power, rated voltage, rated frequency, and rated speed. The drive uses these to build an accurate thermal model of the motor.

Related Rexroth Fault Codes

Source: Bosch Rexroth EFC Drive Manual, 2023

Category: PLC & VFD