What should we do if the long distance underground mining fan blower cannot be started?

Maintaining proper airflow in underground mines is crucial for safety and efficient operation. Long distance underground mining fan blowers play a vital role in this process, but like any machinery, they can malfunction. Here’s a guide to troubleshooting common issues that might prevent your long distance underground mining fan blower from starting:

Initial Checks:

Power Supply: Ensure the power supply is switched on. This seems obvious, but a quick verification can save time.

Circuit Continuity: Inspect the switch, fuses, all electrical contacts, and motor lead wire heads for any signs of damage or wear. A loose connection or a blown fuse could be the culprit.

Motor Issues:

Open Circuit Winding: If an open circuit is detected within the motor winding, a repair can be attempted. This involves carefully heating the open circuit area (not exceeding 130°C to maintain insulation integrity) to soften the paint. The wire can then be lifted and repaired using a welding technique with the same wire specification. After repair, the area needs to be re-insulated, painted, and dried thoroughly.

Winding Grounding or Short Circuit: Similar to an open circuit, a grounding fault or short circuit within the winding can be addressed. The approach involves locating the faulty area and carefully insulating it. This may involve separating shorted wires or insulating a grounded point. As with the open circuit repair, proper re-insulation, painting, and drying are essential after the fix.

Melt Issues:

Burned-out Melt: If the melt (likely a fuse) has burned out, identify the root cause of the overload that caused it to blow. Once the cause is addressed, replace the melt with a new one that matches the motor’s specifications.
Control Equipment:

Incorrect Connection: In some cases, an improper connection within the control equipment could prevent the fan from starting. Double-check the wiring diagrams and ensure all connections are correct.
Important Note:

While the guide provides basic troubleshooting steps, it’s crucial to emphasize that repairs to underground mining fan blowers, especially those involving the motor itself, should only be attempted by qualified electrical technicians with experience working in hazardous environments. Their expertise and safety protocols are essential to ensure proper repairs and minimize risks.