AC/DC Drives Terminology Crossword

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Across
  1. 5. 1. This device is sometimes used for phase control in the inverter section of a variable frequency drive
  2. 6. 16. This electronic device is used in the inverter section to rapidly turn on and off voltage pulses to the motor
  3. 8. 14. A housing for electrical devices and equipment
  4. 9. 17. The turning force of an electric motor
  5. 10. 39. With this, there is no net power transferred to the load
  6. 16. 28. Drives have played a key role in making these air handling systems more efficient.
  7. 18. 5. Rectified DC uses capacitors to reduce the ______________ in the output signal
  8. 20. 10. 3rd, 6th, 9th, etc
  9. 22. 44. A fixed speed that is pre-programmed into the drive
  10. 23. 8. A rating given to equipment where the load may continue for 3 hours or more
  11. 28. 51. What?
  12. 30. 33. Also known as an inductor, this device opposes a change in current
  13. 31. 20. The peak of an AC sine wave
  14. 33. 28. When this condition occurs, a drive over or under corrects the speed output to a motor
  15. 36. 44. How much work can be done in a given amount of time is ____________
  16. 37. 17. A signal used to monitor motor shaft speed
  17. 38. 34. A multiple of the base frequency
  18. 40. 43. A measure of the amount of power that an electric motor can perform
  19. 43. 25. This form of braking an electric motor utilizes power resistors to help “bleed off” current generated by a spinning motor
  20. 44. 18. This is usually only a problem with signals of frequencies approx. 450 KHz to 30 MHz
  21. 46. 4. The second best book ever written
  22. 47. 27. __________ circuit breakers may not open quickly enough to protect a VFD form over-currents, therefore fuses are the protection of choice
  23. 48. 9. During this condition, the motor does not rotate smoothly but steps from position to position
  24. 49. 36. A solid state device that controls the current and voltage signals to the motor. It contains an emmiter, a collector, and a base
  25. 51. 21. A capacitor is an example of a _________ which can pass certain signals but block others
  26. 53. 32. This device is used to rapidly turn on and off the DC voltage that is applied to the inverter section of a VFD
  27. 57. 26. This device opposes a change in voltage
Down
  1. 1. 38. This device typically converts one form of energy into another
  2. 2. 6. This device allows current flow in one direction only
  3. 3. 23. This is the total current draw of a motor when operated at rated capacity
  4. 4. 24. Across the _______means that the motor is directly connected to the source of power, with no manipulation of the voltage or current signal
  5. 7. 3. A device that changes AC to DC
  6. 11. 13. The difference between the synchronous speed and the rotor speed, usually given as a percentage
  7. 12. 22. KVA is equal to KW
  8. 13. 12. The earth
  9. 14. 29. Undesirable electrical disturbances which may be carried by conductors or through the air
  10. 15. 37. Closed contacts open, and open contacts close
  11. 16. 7. The term _______ line refers to a condition where the incoming ac supply voltage is above the acceptable range of a VFD
  12. 17. 56. This controls the current draw of the motor
  13. 18. 40. Root Mean Square
  14. 19. 2. This type of display must be backlit to be read in dimly lit areas
  15. 20. 45. Another name for a SCR
  16. 21. 49. The ideal waveform
  17. 24. 53. This type of control uses very fast switching in the inverter section of a VFD
  18. 25. 11. An adjustable VFD that controls the voltage that is fed to the inverter section
  19. 26. 12. The control element of a SCR or IGBT
  20. 27. 41. This is the voltage produced by a motor that opposes the voltage that causes the motor action in the first place
  21. 29. 55. The association sets the standards for electrical equipment manufacturers
  22. 32. 30. A ___________ contactor bypass setup could utilize a 4 position switch to enable DOLT
  23. 34. 47. Another name for a variable frequency drive
  24. 35. 46. Unlike DC, AC tends to travel along the outer surfaces of conductors. This is known as the _______ effect
  25. 39. 54. A short to ground
  26. 41. 19. The ratio of power out to power in
  27. 42. 35. A(n) _____put follower provides a signal from the VFD that can be used as an input for other controllers or processes
  28. 43. 48. Once the incoming AC is rectified, the DC travels through the _________ before traveling to the inverter section of a VFD
  29. 45. 45. A resistance to a change in velocity
  30. 50. 50. American Wire Gauge
  31. 52. 7. A unit of measure for frequency
  32. 54. 52. This type of control does not utilize feedback devices or sensors to monitor motor speed or position
  33. 55. 42. A ______________ contactor can be used to switch the motor from drive power to line power
  34. 56. 15. A ______ step VFD is the predecessor of the modern day inverter
  35. 58. 31. In the U.S., this current changes direction 60 times per second