Condition
Aboard ship or in a workshop, given access to 3-phase electrical AC motor controller, a phase sequence indicator, and other proper tools and safety equipment.
Performance requirement
| Behavior | Standard |
|---|---|
| The student will: | During assessment, the student shall, at a minimum: |
|
Check phase rotation using phase rotation meter prior starting an ac motor |
Use meter according to manufacturers instructions Identify phase sequence on meter Match phase sequence to motor rotation direction |
|
Determine if phase rotation is correct for desired direction of motor rotation |
Predict direction motor will rotate Verify motor rotates in predicted direction State how to reverse motor |
Location
Assessed in EN‑4231 Sea Term IV: Marine Engineering.
References
- Table A-III/1 OICEW-B2.4
- NVIC Task
See the Assessment Guidelines for additional specifications of behavior and standards.