Delta VFD Questions Test

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The list of questions are below. You can attach other pages with this test question paper to explain your answers and diagrams. You can get help from HowToFactory.blogspot.com and email your answers at mohsinjahan@hotmail.com before 31st January 2019 (deadline).

1. What does VFD stands for?

2. VFD principals and applications?

3. Draw the wiring diagram of VFD 0.4kw running from single phase I/p and drive 3 phase motor.

4. What is the purpose of ‘Jog’ in VFD? How will you wire the VFD for jog operation?

5. How VFD saves the energy and makes the process efficient?

6. What is the use of AVI, AFM, GND, RA, RB, RC, MO, M1 ~M3 terminals in VFD. Explain each.

7. How will you drive the VFD using potentiometer? Make diagram.

8. How will you program a VFD such that it gives an automatically O/p when frequency reaches above 40 Hz.

9. What does ‘second source of frequency’ mean in VFD? What’s its significance?

10. How VFD saves motor from over current and over voltage?

11. Does VFD have internal PLC? What’s its significance?

12. What is over current stall protection and over voltage stall protection?

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