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SACA 203 FINAL EXAM QUESTIONS CORRECTLY ANSWERED.
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SACA 203 FINAL EXAM QUESTIONS CORRECTLY ANSWERED. Can you describe the function and operation of two common types of VFDs? - CORRECT ANSWER general purpose: has three stages to convert AC power into DC, boost and filter it, and then turn it back into AC power at different frequencies and voltag...

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  • December 12, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • saca
  • saca 203 final exam questions correctly answered

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SACA 203 FINAL EXAM QUESTIONS
CORRECTLY ANSWERED.
Can you describe the function and operation of two common types of VFDs? - CORRECT ANSWER
general purpose: has three stages to convert AC power into DC, boost and filter it, and then turn it back
into AC power at different frequencies and voltages



vector drive: uses an encoder or resolver to provide speed and direction feedback from the motor to the
control section of the drive.



Can you explain the advantage and disadvantages of using an AC drive instead of a DC drive? - CORRECT
ANSWER AC motors are smaller and lighter. they also are generally more effiecient in converting input
power to torque. less maintence and cooling requierments as well.



DC motors have more accurate speed control and a much higher starting torque. constant torque at low
speeds and can run overloaded briefly.



Can you state the advantages of starting a motor with a VFD instead of line starting? - CORRECT
ANSWER Better control of acceleration, control of inrush current, use of smaller drive motors, reduced
mechanical stress, ability to switch speeds (motor operation), fault detection, multiple motor control,
and built in braking



Do you know if simple error codes like low voltage can auto reset? - CORRECT ANSWER yes and the
drive will automatically restart the motor.



Can you describe what a VFD programmable parameter is? - CORRECT ANSWER a variable associated
with the operation of the VFD that can be programmed or adjusted.



Do you know the external control capabilities of a VFD? - CORRECT ANSWER 2 wire circuit - keeps the
motor energized



3 wire - seals in the starter circuit

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