TABLE OF CONTENTS | 1. | What are the two main circuits in a DC drive unit? |
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| 2. | What are the main power components used in each circuit, and what are the characteristics of each? |
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| 3. | How is line notching corrected in a DC drive system? |
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| 4. | Describe what the following circuits are used for in a DC drive:
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| 5. | Explain the difference between single-, two-, and four-quadrant systems. |
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| 6. | What is dynamic braking and how is it accomplished? |
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| 7. | What is RFI and how is it controlled in a DC drive system? |
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| 8. | What is a macro? Describe its use. |
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| 9. | What is the difference between a VVI, CSI, and PWM AC drive? |
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| 10. | What is the carrier frequency or switch frequency? |
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| 11. | What is motor cogging? What causes it? |
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| 12. | What is injection braking and how is it accomplished? |
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| 13. | What is the difference between scalar and vector drives? |
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| 14. | How do sensorless flux vector drives differ from standard flux vector drives? |
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| 15. | What is voltage reflection and how is it corrected? |
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| 16. | What are harmonics and what are the corrective actions to reduce them? |
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| 17. | What are the effective shielding and grounding methods used with AC drives? |
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| 18. | What is PID and how is it used? |
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Answers
| 1. | Armature supply and field exciter unit. |
| 2. | SCRs can be turned on with a small milliamp pulse, but must be forced off several amps. IGBTs operate on the same principle, with milliamps required to gate... |
