PHASE 1 – Visual Inspection

Check:

• physical condition of equipment
• signs of overheating
• burned insulation smell
• mechanical damage
• ventilation condition
• cable condition

Visual inspection often reveals the problem before any measurement.

PHASE 2 – Power Supply Check

Check:

• presence of voltage
• phase symmetry
• condition of fuses
• protection status
• voltage drop

Without stable power supply, further diagnostics make no sense.

PHASE 3 – Control Circuit Check

Check:

• start/stop commands
• PLC signals
• protection loops
• relay operation
• sensor status

The control circuit often reveals the cause of operational interruptions.

PHASE 4 – Mechanical Condition Check

Check:

• free shaft rotation
• bearing condition
• coupling with the driven machine
• alignment

A large number of failures are actually mechanical problems.

PHASE 5 – Operating Parameter Measurement

Measure:

• current
• voltage
• temperature
• vibration

This phase provides objective data about the system condition.

PHASE 6 – Electrical Testing

Perform if necessary:

• winding resistance measurement
• insulation measurement
• phase symmetry verification
• connection inspection

This is a more detailed analysis of the electrical condition of the equipment.

PHASE 7 – Test Run and Analysis

If conditions allow:

• perform test operation
• monitor parameter behavior
• analyze system response
• check operational stability

The goal is to confirm stable system operation.

PHASE 8 – Documentation and Reporting

Record:

• cause of the problem
• performed intervention
• recommendations for future maintenance

This phase ensures maintenance traceability.