Efficiently Restoring Functionality Replacing the Internal Encoder of a BFT ELi Underground Motor
- GA Technical Ltd

- Jul 15
- 4 min read
In the world of automation and access control, the reliability of underground motors like the BFT ELi stands out. These motors are essential for gate systems, allowing smooth vehicle access to properties. However, like any machine, they can experience wear and occasional malfunctions. Recently, we faced a situation involving a BFT ELi underground motor that had failed due to a malfunctioning internal encoder. By installing a BFT external limit switch kit, we restored its functionality. This experience is valuable for anyone encountering similar issues.

Understanding the BFT ELi Underground Motor
Before jumping into the repair process, it’s important to understand the BFT ELi underground motor and its workings. This heavy-duty motor is designed to perform under tough conditions while providing excellent reliability. It comprises gears, encoders, and limit switches, all critical for its operation.
The internal encoder is vital as it helps determine the motor's position. It sends feedback to the control unit, ensuring precise movements. If the encoder fails, users can face issues such as gates not opening or closing, leading to significant inconvenience in access control.
Identifying the Fault
When we received the service request, our technician began with a thorough assessment of the motor. Initial visual inspections and basic functionality tests revealed that the motor was unresponsive. At first, it appeared that a full motor replacement was necessary. However, further investigation was critical.
By monitoring the motor’s behavior and analyzing its feedback, we identified the internal encoder as the culprit. Considering the motor's recent history of performance, a malfunctioning encoder seemed likely. This insight led us to explore a solution that wouldn’t require an expensive replacement.
Advantages of Installing an External Limit Switch Kit
After confirming that the internal encoder was faulty, we decided to install the BFT external limit switch kit. This option was advantageous for several reasons:
Cost-Effectiveness: Replacing the internal encoder can cost hundreds of dollars when factoring in both parts and labor. An external limit switch kit offers an affordable alternative, extending the motor's lifespan without breaking the bank.
Ease of Installation: The external kit is made for simple installation, minimizing downtime. This is crucial for businesses that rely on their gate systems, where even short disruptions can impact operations.
Enhanced Reliability: External limit switches generally have greater durability compared to internal components. This can lead to fewer issues down the road, increasing reliability and peace of mind for users.
Simpler Future Upgrades: Using an external solution allows for easier upgrades or adjustments in the future, keeping the system up-to-date and efficient.
Steps to Replace the Internal Encoder with an External Limit Switch
The repair process involved several clear steps:
1. Safety First
Before starting any repairs, safety is the top priority. Always disconnect the power supply to the motor to avoid accidental activation. Clear the area around the motor to ensure a safe working environment.
2. Remove the Motor Cover
Using the right tools, carefully take off the protective cover of the BFT ELi underground motor. This access is essential for reaching the internal components, including the encoder.
3. Disconnect the Internal Encoder
With the motor cover removed, locate the internal encoder. Carefully disconnect any wiring and remove it. Taking note of how the internal encoder was connected will be helpful when you install the new external limit switch.
4. Install the External Limit Switch Kit
Following the kit's instructions, install the BFT external limit switch. Make sure it's securely mounted and positioned to accurately monitor the motor's movements.
5. Reconnect Wiring
Reconnect the wiring for the external limit switch based on your observations of the encoder connections. Verify that each connection is secure to avoid performance issues later.
6. Test the System
Once everything is connected, restore power to the motor and test the system. Confirm that the limit switch provides accurate feedback regarding the motor's movements. Watch for any irregularities and make adjustments as necessary.
Benefits of Professional Maintenance and Repair
While some may consider DIY repairs, several advantages come with hiring a professional for these tasks:
Expertise: Professionals have the know-how to diagnose and fix issues effectively, which can help prevent further damage or complications.
Time-Saving: Repairs can be complex and may require specialized tools. Professionals save time by ensuring the job is done correctly the first time.
Warranty Protection: Using a certified technician can help protect warranties, providing confidence for future repairs or replacements.
Maintenance Tips for BFT ELi Underground Motors
To avoid future problems and extend the life of BFT ELi underground motors, keep the following maintenance tips in mind:
Regular Inspections: Schedule periodic assessments to monitor the motor and its components. Early detection of issues can save time and costs.
Lubrication: Regularly lubricate moving parts to minimize friction and wear.
Check Connections: Inspect wiring and connections frequently for signs of wear or corrosion.
Keep it Clean: Ensure that the area around the motor remains clean to avoid debris interfering with its operation.
Customer Satisfaction and Feedback
After completing the repair, we received positive feedback from the customer. They valued our swift response, thorough work, and timely restoration of the motor’s functionality. This experience highlights the importance of understanding customer needs and delivering high-quality services.
Troubleshooting Future Problems
If you face issues with your BFT ELi underground motor later, here are a few troubleshooting tips:
Check Power Supply: Ensure the motor is receiving power. A blown fuse or tripped circuit breaker could be a simple fix.
Observe the Motor: Listen for unusual noises or watch for irregular movements, which could indicate specific component failures.
Document Changes: Keep records of past repairs and modifications. This can simplify diagnostics if problems arise again.
Final Thoughts
In our recent repair, we effectively restored the functionality of a BFT ELi underground motor by replacing the faulty internal encoder with a BFT external limit switch kit. This process exemplifies how adaptive repairs can maintain system performance while saving costs for the customer.
For property owners or managers with automated systems, understanding maintenance and repair aspects of motors like the BFT ELi is vital. Regular inspections, prompt diagnostics, and knowing when to seek professional help can significantly impact the smooth operation of your systems.
Proactive maintenance and repair can extend equipment lifespan and reduce unexpected downtime. With the right approach, anyone can become more knowledgeable about the systems they depend on daily.





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