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Managing the Indramat E251 Motor Overtemperature Warning

21 December, 2023   |   Indramat, E251, Motor, Overtemperature, Warning

Indramat Motor with error title

In the field of industrial automation, comprehending the intricacies of components like the Indramat E251 Motor, a key element in Rexroth automation servo motors, is essential for maintaining smooth operations in various facilities.

Interpreting the E251 Motor Warning

The E251 warning in an Indramat motor is essentially an alert indicating that the motor's temperature has exceeded a safe threshold, specifically 145°C. This threshold is set to preemptively avoid damage to the motor. The warning allows the motor to continue operation, offering an opportunity to rectify the issue before it escalates into a critical problem. It's a proactive measure, signaling the need to inspect and cool the motor.

Common Causes of E251 Motor Overheating

  1. Overloading the Motor: Operating the motor beyond its designed capacity often triggers the E251 warning.
  2. Installation Errors: Incorrect setup can lead to inefficient cooling and overheating.
  3. Accumulation of Dirt: For motors with surface cooling, cleanliness is key for effective heat dissipation. In motors with blower units, clean vents are crucial.
  4. Thermo Sensor Malfunction: A damaged or incorrectly installed thermo sensor may inaccurately measure temperature, causing overheating.
  5. Incorrect Parameter Settings: Inappropriate configuration settings can lead to operational inefficiencies and overheating.

Troubleshooting the E251 Warning

  1. Identify the Warning: Confirm the presence of an E251 warning on the H1 display, indicating motor overheating.
  2. Cease Operation: Temporarily stop the motor to prevent additional strain and potential damage.
  3. Check Environmental Factors: Ensure the ambient temperature is within the acceptable range (0 to +45°C).
  4. Inspect for Physical Obstructions: Look for any blockages that might impair motor cooling.
  5. Evaluate Motor Conditions: Check the motor for signs of wear or damage.
  6. Consult for Thermo Sensor Issues: If a thermo sensor malfunction is suspected, seek specialized assistance from an Indramat product repair expert.
  7. Reset and Monitor: After addressing these issues, reset the system and monitor the motor's performance.

Tips for Checking Motor Ratings and Conditions

  • Review Specifications: Confirm that the motor's operational parameters are consistent with its specifications.
  • Assess Motor Load: Ensure the motor isn't overloaded beyond its capacity.
  • Inspect for Cleanliness: Regular cleaning can prevent overheating due to dirt accumulation.
  • Check Ventilation: Maintain clear ventilation paths for effective cooling.

By following these steps and guidelines, you can effectively address E251 warnings, ensuring the safe and efficient operation of your Indramat motor.

Need Further Assistance? Wake Industrial Offers Expert Solutions

For specialized support in industrial automation, particularly with Rexroth Indramat products, turn to Wake Industrial. We offer expertise in a range of Indramat products, including MSK, MHD, and MDD series motors. Whether your Indramat motor requires repair, or if you're looking to buy or sell Indramat components, Wake Industrial provides reliable and professional services to meet your needs.

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Contact Information
North Carolina Office

Indramat USA
1620 Old Apex Road
Cary, NC 27513


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International: 1-919-443-0207




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