Phase Loss Troubleshooting Flow 

Use a voltage tester to check each phase voltage.

• Decision: Are all phases at normal voltage levels?
• Yes: Proceed to the next step.
• No: Identify and address the voltage issue (e.g., power supply fault, line issues). Fix the issue and retest.

Examine cables and connections for breaks, wear, or poor contact.

• Decision: Are all cables and connections intact and properly connected?
• Yes: Proceed to the next step.
• No: Repair or replace damaged cables or connections. Retest.

Check the functionality of phase sequence protection devices and overload protection devices.

• Decision: Are protection devices functioning correctly?
• Yes: Proceed to the next step.
• No: Repair or replace faulty protection devices. Retest.

Check circuit breakers, fuses, and contactors for faults or malfunctions.

• Decision: Are all power system components working correctly?
• Yes: Proceed to the next step.
• No: Repair or replace faulty components. Retest.

Action: Review records for installation and recent maintenance activities.

• Decision: Is installation and maintenance properly done?
• Yes: Proceed to the next step.
• No: Correct any installation or maintenance errors. Retest.

• Action: Perform a final test to ensure all issues are resolved and the motor is operating correctly.
• Decision: Is the motor running smoothly without phase loss?
• Yes: End the troubleshooting process.
• No: Revisit previous steps as needed to address any remaining issues.